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9a9aa90a-cd5b-440b-8fce-51c1c7f969ef | pipe from two pipes. An impor tant point is that the inner
part at the conjunction location must be rounded. Finally,
we make a smooth transition from a pipe with an elliptical
cross section to a round pipe, which is the main central part of the interaction region , where electron and p ositron
beams collide. We u... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 1 |
7ff82f37-edff-4f70-b06b-487529d0a279 | This new geometry differs from the previous geometry
described in FCC -ee CDR [1], mainly by the size of the
central pipe. I n the previous geometry the radius of the cen-
tral beam pipe was larger , being 15 mm. Decreasing the
size of a central part gives a possibility for the FCC detec-
tor to make more precise t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 1 |
59a0ae0a-8a56-4956-b2dd-d938cadd238f | WAKE POTENTIALS AND TRAPPED
MODES
Using this CAD model, we performed wake field calcu-
lations giving to all wall materials an infinite conductiv-
ity. This approach is usually used for calculation of the so called “geometrical” wake potentials. The result for the
wake potential is shown in Fig. 4 by a red line . W... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 1 |
4fb17253-f2ef-4f75-87cd-0a8715a10e7e | geometry The electric force line distribution of the mode
is shown in Fig. 5 .
Figure 5: An Unavoidable Trapped Mode. Electric Force
Lines Distribution .
The trapped mode is concentrated near the conjunction
of two pipes, in a region with a maximum transvers size. This mode has a longitudinal electric compone... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 1 |
85d0e5cf-4a85-4014-b6b9-e61bd3e59d07 | more image current losses due to the conductivity of the
metal pipe walls. The first estimate of heat load in the
central gives approximately 150 W/m.
HEAT LOAD DISTRIBUTION IN IR
We use specially designed CAD model as an input for
the wake filed calculations using the CST code. This CAD model consists of diffe... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 1 |
de33d617-adc3-4bad-b445-bbc92ab3c011 | conductivity of 4.561*10-7 S/m. Two transition parts are
also made from AlBeMet 162. The other two parts are
made from copper , which conductivity is 5.8*10-7 S/m. At
first, perform wake field calculations, assuming that all
materials have an infinite conduc tivity. Then perform
wake filed calculations, still as... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 2 |
9e601d00-e3b5-4f5c-a2ba-545151c7e688 | beam energy [GeV] 45
beam current [mA] 1280
number bunches/beam 1000
rms bunch length with SR / BS [mm] 4.38 / 14.5
bunch spacing [ns] 32
Figure 6: Heat Load Distribution in the FCC IR
THE COOLING SYSTEM
In order to remove the heat produced, we will use a liq-
uid coolant that will flow within the cool... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 2 |
587d0b11-ff93-48f5-bce2-253b86f3b09e | nosity monitor (Fig. 9). The trapezoidal chamber is cre-
ated using the 50 mrad cone as the cutting profile, to as-
sure the respect of the spatial constraint. To reduce the
cooling material, the design provides five couples of channels for each side; in this way it is possible to use the
required quantity of cool... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 2 |
baf390c4-25a1-4433-8b83-bc852988566b | locity: 0,2 m/s. Inlet temperature: 18°C. Convective coef-ficient: 1200 W/m2K.
Figure 8: Water Cooling System
Figure 9: Ansys Simulation of The Temperature in The
Central Chamber.
The temperature distribution in the central chamber . is
shown in Fig. 9 and the correspondent temperature in
other IR parts of th... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 2 |
e328429f-a263-48d1-afdd-1746ff30756a | [2] A. Novokhatski, M. Sullivan, E. Belli, M. G. Costa, and R.
Kersevan, “Unavoidable trapped mode in the interaction re-
gion of colliding beams”, Phys. Rev. Accel. Beams , vol. 20,
p. 111005, 2017.
doi:10.1103/PhysRevAccelBeams.20. 111005
[3] A. Novokhatski, “A new low impedance IR FCC ee beam
chamber”, unpub... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 3 |
6e4038c7-1184-427d-93f4-e209c105694f | 1 cm Radius Beam Pipe”, unpublished.
[8] Michael Benedikt , “FCC feasibility study overview ”, FCC
Week 2022 , Paris, France, May 2022,
doi:10.17181/videos.2296021
[9] F. Fransesini, L. Pellegrino “ Preliminary calculation for par-
affin cooling system of fcc -ee interaction region vacuum
chamber “, INFN -LN... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 3 |
f2ac24d8-13cb-4f70-8f43-bb395b244fff | PROBLEMS AND CONSIDERATIONS ABOUT THE INJECTION
PHILOSOPHY AND TIMING STRUCTURE FOR CEPC
M. Li∗, D. Wang, X. H. Cui, J. H. Chen, G. Lei, G. Li, C. Meng, J. R. Zhang, J. Y. Zhai, J. Gao,
C. H. Yu, Y. H. Li, Y. Zhang, T. M. Xin, Z. S. Zhou, X. P. Li, IHEP, Beijing, China
Abstract
Inthispaperwewillshowtheinjectionphilosop... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 0 |
9d3a0ab0-45b7-4bae-8c22-6fbb753ea4dd | 100 km double ring collider with two interaction points pro-
posed to be working at four energy schemes of Z pole (45.5
GeV),W(80GeV),Higgs(120GeV)andtt(180GeV)[1].
The purpose of injection and extraction timing is to connect
various subsystems of the accelerator in series and work
together. The difficulty of CEPC inje... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 0 |
6cbe09c7-7614-4dc4-ba50-9f96803adf71 | in CDR does not meet the requirements of high luminos-
ityscheme,wehaveproposedanewdesignschemeforthe
injection system.
INJECTION PHILOSOPHY
Whether direct injection can be achieved depends on the
common frequency of these major subsystems. The fre-
quency choice in CDR is shown in Table 1, in which the
SHB1 and SHB2 a... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 0 |
8b10811a-1124-4684-b3ab-2ca06d88fab8 | luminosity drop, so the whole scheme has to be modified.
We consider replacing the subharmonic bunchers and the
thermionic gun with photocathode RF gun so that the com-
mon frequency is raised from 13 MHz to 130 MHz, and
∗limeng@ihep.ac.cntheminimumtimestepbecomes7.692ns. Inaddition,the
minimum bunch separation in the ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 0 |
3ab22fb0-32a3-4edd-9348-19be40fdca88 | operation. A schematic of the injection system is shown
in Fig. 1 [3]. The injection system consists of a 20 GeV
Linac, followed by a full-energy Booster ring. Electron and
positronbeamsaregeneratedintheLinac,andthepositrons
needtobeinjectedintheDRfirstlywhiletheelectronspass-
ingthroughabypass. Thebeamsaretheninjected... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 0 |
279a129e-5e0a-4873-9b8c-0143faf65c7b | Dampingring(DR)firstby100Hz/200Hzinjectionkicker.
DuringeachlinacRFpulseabunch/trainisinjectedintothe
DR, after 4 bunches are stored, each bunch/train which is
cooled after 20 ms will be extracted and re-injected into the
linac. Atthesametime,anewbunch/trainwillbeinjected
intotheDR.Themaximumbunchnumberinthedamping
rin... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 0 |
4b7cd3cb-5d38-4042-9bd2-99ff14f20536 | the 100 Hz / 200 Hz injection kicker. Figures 2 and 3 show
the injectionprocess from Linac toDR for two schemesof
linac. Andthenthesebunchesareinjectedintothebooster
bunch by bunch at 100 Hz. And then ramp the booster up
to given energy and all the bunches are extracted one by
one by the 1000 Hz extraction kicker excep... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 1 |
fba8c113-3d10-4997-aaeb-12b1fc4615fc | risetimeofthekickers,bunchesarearrangedtrainbytrainin
the collider as shown in Fig. 7. The bunches in the collider
are arranged in bunch trains about 1.85 µsand with gaps
about500ns. Thebunchesintheboosterarearrangedinthe
same bunch train structure.But due to the current limit in
the booster,the number of trains in the... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 1 |
b7f127a3-3e39-45d0-a3b2-efdd1af31ed4 | booster is ramped up to 45.5 GeV in 1.6 s. After that all
bunchesinboosterareinjectedtrainbytrainintothecollider
by 1000 Hz extraction kicker. It takes three cycles for a
single beam to be filled, so there are totally 11520 bunches
in the collider ring,including 144 trains and each train 80
bunches,in which the bunch s... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 1 |
9d0c4066-b010-4326-800e-fcb68b510094 | Figure 8: The process of booster ramping and top-up injec-
tion at Z pole.
without collision is dominated by the Toucheck lifetime and
becomesmuchshorterwithcollision. Collisionstartafter
eachbeamisinjectedtofullcurrentindependently. ButatZ
pole,thefullinjectionadoptsbootstrappingscheme[4,5].
The collision start from 2... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 2 |
65c29187-6e7c-4d1e-b986-a4e0561b8c9d | variation of current in the collider with time is shown in
Fig. 9.
Figure 9: The variation of current in the collider with time.
UPGRAD CONSIDERATION
Considering the future 50 MW potential for Z operation,
thebunchseperationwhichisrequiredinthecolliderring
maybe16ns. Theminimumbunchseperationthatcanbe
realized in the m... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 2 |
46804a79-3414-4472-9574-f205902df0b1 | have been designed with the consideration of clock system,
RF frequency choice, bunch pattern, injection hardware and
so on. However, considering the requirement of the injec-
tion bunch number and clock system, the RF frequencies in
theLinacandacceleratorringsarenotcompatible. There-
fore, we modified the original sch... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 2 |
9855633f-757d-468f-91a2-2162c15a558c | [1]Y. Wang et al., “Lattice Design of the CEPC Collider Ring
for a High Luminosity Scheme”, in Proc. IPAC’21 , Campinas,
Brazil, May 2021, pp. 2679–2682.
doi:10.18429/JACoW-IPAC2021-WEPAB033
[2] CEPCStudy Group,“CEPC ConceptualDesign Report: Vol-
ume 1 - Accelerator”. doi:10.48500/arXiv.1809.00285
[3]J. Chen, “CEPC inj... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA094.pdf | 2 |
8b7c13f6-bb0b-4ddd-b0ff-3866eca5415a | DESIGN OF A NEW SPS INJECTION SYSTEM VIA NUMERICAL
OPTIMISATION
E. Waagaard, M. J. Barnes, W. Bartmann, V. Bencini, J. Borburgh, L. S. Ducimetière, T. Kramer,
T. Stadlbauer, P. Trubacova, F. M. Velotti, CERN, Geneva, Switzerland
Abstract
The Super Proton Synchrotron (SPS) injection system
plays a fundamental role to pr... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 0 |
21588c6a-03a8-494f-a79a-25e1760d7efd | optimal accelerator system design.
INTRODUCTION
TheSPSisthelastinjectoroftheLHC,hencethesecond-
largest accelerator of the CERN accelerator complex [1].
One of the main duties of the SPS is to provide high-
brightness beams of high quality to the LHC physics pro-
gram, as well as high-intensity beams to the fixed-targe... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 0 |
868e84f8-bee5-4318-b914-1d95c5ad338c | (PS) via theTT10 transfer line. The injection occurs in the
horizontal plane in a single turn. The schematic view of the
main elements is illustrated in Fig. 1.
Figure 1: Illustration of present TT10/SPS injection.
There arefour septa (denotedMSI) - insertion magnets
thatdefinetheborderlinebetweentheringandthetransfer
... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 0 |
53eebe52-68cb-4623-bf7e-e99568083b1f | dump denoted TBSJ is used.
Figure 2: Cross-section of MKP-L kicker tank.
INJECTION SIMULATIONS
Forthe studies and simulations, amodel of the SPS injec-
tion system was developed using MAD-X [3], presented
in detail in [4]. To simplify the integration with other
frameworksforoptimisation,weusedthepythonwrapper
cpymad[5]... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 0 |
6a636a68-4ffa-4605-8958-5139ee458313 | filamentationandemittanceblow-up,reducingluminosity
and beam quality delivered to the experiments. Thus, we
strive to minimise horizontal displacement at injection with
zero-valuedposition 𝑥andtransversemomenta 𝑥′forasta-
ble beam. A safe beam dump is also required - when the
MKPs are powered off, the beam has to hit... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 0 |
366de610-c255-402e-bc71-9e3b555344d8 | whereaper𝑥(𝑠)isthehorizontalmechanicalapertureof
themachine,with 𝑦replacing𝑥fortheverticalcase. Forthe
horizontal plane, the beam size 𝜎𝑥(𝑠)is defined as
𝜎𝑥(𝑠)=√︃
𝛽𝑥(𝑠)𝜀𝑥+(𝐷𝑥(𝑠)Δ𝑝/𝑝)2,(2)
where𝐷𝑥isthe dispersionfunction, 𝜀𝑥isthe geometric
emittance,𝛽𝑥is the beta function, and Δ𝑝/𝑝is the mo-
... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 1 |
52b67110-b127-4c5a-b41d-43acf21c9649 | applicabletoalltheoptics-areprimarilyfulfilledbyvarying
magnet strengths and positions of the septa and the kickers.
Atthelowerlevel,theseparametersconstitutethedegrees
of freedom (DOF), or actors. Once these low-level require-
ments are fulfilled, we also strive to deploy minimal magnet
resources: maximum magnetic fie... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 1 |
4d5b8ee7-c15c-4f1a-afe1-50024ea0a8ea | whole blade. The reduced thickness of the proposed MSI
bladesallowsformorespaceforthebeamenvelope. Thus,
this new MSI blade remains a fixed parameter.
HIERARCHICAL OPTIMISATION
The injection system requirements and actors spanning
overmultiplelevelsareincorporatedinahierarchicaloptimi-
sation framework, where the low-l... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 1 |
70d529ab-36bd-43b2-a6fc-8c3cef86cc85 | final solution.
Figure 5: Illustration of the hierarchical optimiser.
The meta-optimiser (a wrapper function) first creates a
globalenvironmentobjectwithagivenkickermagnetcon-
figurationfromthetuple( 𝑛1,𝑛2). Theenvironmentcontains
all the attributes and a stepmethod, which takes the tu-
pleasinputparameterandoutputst... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 1 |
e82bd2e8-5c5c-4a62-bd51-db7c9e1415e2 | penalty=max(0,𝐴𝑥, min−𝐴𝑥)2(4)
to which a penalty is added: the square of the excess of
the present acceptance 𝐴𝑥, with𝐴𝑥, mindefined in Eq. (1).
Thus,beamlossesoranimproperlydumpedbeamtrajectory
are heavily penalised. The low-level objective function with | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 1 |
5f9ff07f-3ec4-410c-8958-6251cf83a617 | itspenaltiesremains general, which canbereplacedbyor
coupled with the vertical plane if desired.
OPTIMISATION METHODS
The low-level objective function is optimised for each op-
tics with the adaptive Nelder-Mead algorithm, implemented
inscipy[8]. The global environment then selects the mag-
netpositionsfromtheopticstha... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 2 |
86f1705f-c707-4021-a987-92cb2957e0dd | GAs are inspired by the process of natural selection, where
a starting population of initial settings is sampled and the
(high-level)objectivefunctionsareevaluated. Thefittestcan-
didatessurviveandareselectedforthecrossover,combining
intooffspringwheresomemutationsmayoccuraccording
to pre-defined probabilities. Even wi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 2 |
7eb0282a-aa3a-49cd-8234-f9f54375d37f | (left - injected beam, right - dumped beam).
Although∫
𝐵𝑑𝑙forQ20andQ26wouldincreaseby5-6%,
theinjectedun-kickedbeamreachestheTBSJwithoutthe
needofanextradipoleasusedtoday-agreatsimplification
for future operation.Aclose-upofthe MKPtanksinthepresentandproposed
injectionsystemisshowninFig.7. Thenewconfiguration
only c... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 2 |
d607192d-27fd-4607-9456-70913342e754 | More studies are needed to evaluate alternative solutions
and toassess the risk associated withdirect impact onthe
MKP, possibly with local shielding.
Figure 7: Present and proposed MKP configuration.
CONCLUSIONS
ThecurrentSPSinjectionsystemhasseenaradicalevo-
lution since its first design, and the characteristics of t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 2 |
6d610f97-4a6b-4c51-b9e1-f33a1b3ee410 | erator systems, even with higher complexity. We stress that
although the SPS injection is a specific case, the high-level
discretedesignofmagnetmodulesandconfigurationscan
in principle be extended to almost any accelerator sequence,
as described in a pseudo-algorithm in [4].
REFERENCES
[1]P. Collier et al., SPS as inje... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 2 |
c5355d48-be28-4a9d-ae7f-b38b5b319cc7 | [7]Y.Dutheil,F.Velotti, andB.Goddard. The blind linemaker:
Genetic algorithms for multi-objective optimisation (2020).
Available at https://indico.cern.ch/event/964060/ .
[8] SciPy Official Website, available at https://scipy.org/ .
[9]PymooOfficialWebsite,availableat https://pymoo.org/ . | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA097.pdf | 3 |
b1147bb6-7a8f-4612-bb0f-a7f95481cb50 | DEMONSTRATION OF NON-LOCAL CRYSTAL SHADOWING AT THE
CERN SPS
F. M. Velotti,∗M. Fraser, P. A. Arrutia Sota, M. Calviani, M. Di Castro, S. Cettour Cave,
M. Donze, L. S. Esposito, B. Goddard, V. Kain, E. Matheson, S. A. Solis Paiva, R. Seidenbinder
CERN, Geneva, Switzerland
Abstract
ThemainSPSusersaretheexperimentsinstall... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 0 |
67e94936-d037-4ef4-9a81-d1d8e21a3ba8 | shadowingintheSPSandawaytofurtherreducelosseswith
anon-localinstallationofthecrystal. Afterthelastyearly
stop, a new Si bent crystal was installed in LSS4 of the SPS.
In this paper, the first results from measurements with beam
arereportedtogetherwithlimitationsandpossibleupgrades
of the present installation.
INTRODUCT... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 0 |
6c666469-daa0-4ae6-8408-cce821df65b0 | circulatingandextractedbeamswithathinbladeexposedto
the primary beam. This is an intrinsic limitation of the con-
ventionalthird-integerslowextractionmethod. Apossible
waytomitigatethelossesontheZSwiresistousesilicon
bentcrystals[1,2],whichcandeflectthebeamawayfrom
the septum by exploiting channelling and volume reflec... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 0 |
9c337f50-c43f-4e95-a454-aa11c13cfd91 | inLSS4(TECA[5]). Thecrystalinstalledis 0.8mmthick,as
alreadyavailableinLSS2. Inasecondstage,athickercrystal
will be installed to fully exploit the non-local shadowing
concept.
∗francesco.maria.velotti@cern.chIn this paper, we present the results of a measurement
campaign to demonstrate non-local shadowing of the ZS
sep... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 0 |
eee90d58-b2bb-4fb7-9302-c4dff32137bd | to the separatrix. Assumed ZS width of 0.4mm
60 70 80
x / mm-1.8-1.6-1.4x' / mrad
Zero
fieldNon-zero
Field
100101102
Intensity (a.u.)
Figure2: Trace-spacerepresentationattheextractionsep-
tum, ZS, with the perturbation induced by the interaction of
the TECA with the beam. In grey, the density of the coordi-
natesare... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 0 |
5710cddd-a194-450b-821f-114220d272e9 | NON-LOCALSHADOWINGSIMULATIONS
Thereport[3]explainstheconceptoflocalandnon-local
shadowing and how it can be applied to reduce losses in
the extraction channel region using thin crystals. Non-local
shadowinginvolvesplacingacrystalinadifferentaccelerator
sectorthantheZS,whichallowsforbetteruseofthemachine
space, lower lo... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 1 |
7ece3792-3bdc-4a22-8825-5c8d63fcf882 | tion also affects the emittance of the extracted beam, which
can be significantly lower than in the local shadowingcase.
This facilitates the transport of the extracted beam to the
targets and prevents losses in the transfer line. Moreover,
the amplitude-dependent motion influences the width of the
lowdensitywellinthes... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 1 |
e3d108ad-048d-4455-825e-56a27977116a | the ZS, when placing the crystal at the angle for the maxi-
mum loss reduction, is depicted in Fig. 2. The proximity of
the channelledbeamlet to the extractedportion of the sepa-
ratrixensuresthatthebeamenvelopeofthewholeextracted
beamcaneasilybetransportedthroughthetransferlineto
the targets.
MEASUREMENTS IN THE SPS
T... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 1 |
076d0567-3baa-4b81-bbb2-22e456ede5c6 | thebeamhadtobereducedfrom 35mmto25mminorderto
achieve the channelling angle. This issue will be addressed
in future versions of the goniometer.
Thegoniometeranditslocationwereconceivedconsid-
eringparalleloperationwithLHCbeams,asthecrystalis
installedontheoppositesideofthemagneticseptumusedfor
theLHCbeamextraction. The... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 1 |
c33f9323-0f9d-4c71-aeaa-c51063a0300a | ZSnormalisedbythenominallosseswithoutcrystal. The
x-axis is the measured angle of the TECA.
LossReductionviaNon-LocalCrystalShadowing
-1900 -1880 -1860 -1840 -1820
TECA angle / rad
0.500.550.600.650.700.75Relative losses (1)
Figure 4: Measured angular scan of the TECA while the
TECS is oriented in volume reflection.
Th... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 1 |
35ef1e7c-ac5a-4cf1-bcc0-f9a45bc43847 | BLM.10020BLM.11407BLM.11436BLM.11507BLM.11605BLM.11705BLM.12020BLM.12108BLM.12220BLM.12308BLM.13308BLM.13420BLM.13508BLM.20020BLM.210106BLM.210222BLM.210280BLM.210305BLM.211415BLM.211631BLM.211708BLM.211713BLM.211714BLM.211732BLM.211741BLM.211742BLM.21636BLM.21652BLM.21657BLM.21673BLM.21679BLM.21694BLM.21705BLM.21772BL... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 2 |
46c08835-043d-415f-aaba-562ca9223601 | aligned in VR and SH (magenta), respectively. In the legend is also quoted to relative loss reduction for the sum of all
BLMs along the ring.
beam,andclearlydependingonthepositionofthecrystal
with respect to the ZS.
Loss Reduction via Non-Local and Local Crystal
Shadowing Combined
During the last available data collect... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 2 |
3a366f47-33cb-4e9e-bc97-26173dc4a8a1 | TECS and TECA were aligned to fully shadow the ZS.
WenoticedthattheoptimalangleoftheTECAformax-
imising the loss reduction depended on whether it was used
alone or in combination with the TECS. This can be ex-
plainedbythefactthattheZSshadowingconceptisaone-
turnprocess. ThebeaminteractionwiththeTECAaffects
the phase-s... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 2 |
0d611b07-9cb9-4439-a9cf-850cc4287926 | maindrawbacksofthelocalshadowingconceptviaTECS
istheimpossibilityofoperatinginchannellingduetochal-
lenges in transporting the channelled beamlet to the targets,
as reported in [3, 6].
Themainobstacleencounteredforafulldeploymentwith
highintensitywasthebeamlossesregisteredatthecrystal
location. Such an increase is inev... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 2 |
e119e00a-22fc-4f8d-b617-734a3f841c47 | andreducedthelossesintheextractionregionby45%,in
agreement with tracking simulations. No significant loss
increase was observed elsewhere, except at the crystal loca-
tion. Theseresultsconfirmthefeasibilityofthenon-local
shadowing technique proposed in [4].
We also demonstrated that combining both TECS and
TECAresultsi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 2 |
0cf8cf7b-2f0d-4bf2-906a-2bbc21313157 | are planned for this year and studies of possible shielding
solutions are also underway.
REFERENCES
[1]A. Asseev and M. Gorin, “One more possibility of using bent
crystals for beam extraction from accelerators,” Nuclear In-
struments and Methods in Physics Research Section A: Accel-
erators, Spectrometers, Detectors an... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 2 |
2e79f5c8-95e8-4e64-8bd9-4fe2a7349f99 | [3]F.Velotti etal.,“Septumshadowingbymeansofabentcrystal
to reduce slow extraction beam loss,” Physical Review Accel-
erators and Beams , vol. 22, 9 2019.
doi:1/zero.alt4.11/zero.alt43/PhysRevAccelBeams.22./zero.alt4935/zero.alt42
[4]F.M. Velotti, “Higher brightness beams from the SPS for the
HL-LHC era,” Presented 09 ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA098.pdf | 3 |
bc47c846-d413-458b-8ed7-f492d9ca38f8 | PRODUCTION OF SLOW EXTRACTED BEAMS FOR CERN’S EAST AREA
AT THE PROTON SYNCHROTRON
M. Delrieux∗, P. Arrutia Sota, T. Bass, K. Bilko, M. Coly, D. Cotte,
M. A. Fraser, R. Garcia Alia, A. Huschauer, A. Lasheen, G. Imesch, E. P. Johnson
CERN, 1211 Geneva 23, Switzerland
Abstract
SincetheupgradeandrenovationofCERN’sEastArea
... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 0 |
74ba34e2-4a7d-46d2-86d1-76131ad01eeb | heavy-ionbeamsforthecollaborationbetweenCERNand
the European Space Agency (ESA), striving to establish
a novel and flexible, high-energy, heavy-ion radiation test
facility.
INTRODUCTION
The CERN PS has been in operation since 1959 and pro-
vides slow extracted beams to experiments in the East Area.
Duringitsannualphysi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 0 |
394d670d-e5df-4983-955d-09bb76a34bef | instrumentation, redesigned beamline configurations,
renewed beam optics, new powering schemes and energy
recovering power supplies, which significantly reduce
the energy consumption [2]. Following this renovation,
demandbytheusercommunityhasincreasedandproposals
were made to improve the extraction process. These
inclu... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 0 |
dfa379a9-df9e-45a4-93f9-0f8fac42a2f9 | involvesmuchlowerenergiesandintensitiesthanthoseused
forprotons. Additionally,irradiationofspacecomponents
requiresimprovedmanagementoftheacceleratorsettings
through the control system to enable rapid adjustments to
the desired extraction energy.
Toalargeextent,theSXhasremainedunchangedsinceits
renovation by Steinbach ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 0 |
0b682a3b-70ab-4b4c-b5e1-86a8ce9365b4 | SLOW EXTRACTION DESCRIPTION
ThePSringismadeof100combined-function,normal
conducting magnets used for both bending and focusing the
beam. Each main unit (MU) is composed of two alternating
gradienthalf-units: onefocusingandonedefocusing. The
MUsarealsoequippedwithadditionalcompensationcoil
circuits: the figure-of-eight ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 0 |
3965e57c-9ba8-40ca-aaf4-5caf60e7979e | MUs.
1The CHIMERA activity has been technically supported and partially
funded by the European Space Agency.
2The HEARTS project is funded by the European Union under Grant
Agreement No. 101082402, through the Space Work Programme of the
European Commission. | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 0 |
7c876bfb-5b3b-4acb-ad07-64f257c3d6b8 | At the 24GeV/c flat-top, an initial horizontal tune of
about 6.2is set with the MUs and PFWs. Two dedicated
quadrupoles(QSE)areusedtosetthehorizontaltunejustbe-
low the third-integer resonance. The resonance is driven by
threesextupoles(XSE).ADCelectrostraticseptum(SEH23)
is located more than two betatron wavelengths u... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 1 |
0640f2b7-33be-4e92-ba45-991bbd54dd71 | cycle,includingtheinsertionofaflatsectioninthemagnetic
field at 24GeV/c prior to the extraction ramp. This was
done to facilitate the RF phase jump for the bunch rotation,
performedjustbeforedebunchingtoincreasethemomentum
and tune spreads, under stable conditions, as opposed to
during an accelerating ramp.
To avoid ov... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 1 |
91173626-d453-4998-89f7-df8660d5b6cd | 3The neutron time of flight facility is a pulsed neutron source coupled to a
200m flight path, for which the PS sends a short high-intensity 20GeV/c
proton bunch, sharing the same PS cycle.extractionmomentumforTOF.However,eddycurrentsarise
when the W8L goes to zero upon reaching 24GeV/c, with a
significantimpactontheSX... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 1 |
549af8d8-5453-46c6-8a90-1e43c8a522cd | importantefforthasbeenmadetoincorporatethetransfer
functions for all transfer line magnets, and the settings of
thevariousmagnetsarenowdefinedinstrength,normalized
by the beam momentum.
All functions for magnets now use the new LSA beam-
oriented normalized strength parameters. The constant
strength is transformed into... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 1 |
4bc133e4-3b4f-4336-ba8c-6a813a6ff72d | position stability and beam shape in the various beam lines.
AhorizontaltailisstillpresentintheT8line,butislikely
tobecausedbyscatteringofthebeamthroughairregions
(30m), vacuum windows,and beam instrumentation, creat-
ingatailoflow-energyparticlesobservableinthehorizontal
plane.
New settings have also been put in place... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 1 |
48843ece-c16f-4fd7-8d06-d4229975845e | energy extractions at a much faster pace than prior to LS2.
ION IRRADIATION ACTIVITY IN CHARM
The ion irradiation activity in the CHARM
(CHIMERA/HEARTS) facility aims to explore the
feasibility of providing high-energy ion beams to internal
and external users for research on radiation effects on
electronic components i... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 1 |
8b8f9d23-3169-4413-b92c-38f9b2d1c272 | Linear Energy Transfer (LET) range of approximately
∼10–40MeV ·cm2·mg−1. Thisrangeallowsforapenetration
depth of over 1mm in silicon, making it suitable for Single
Event Effect (SEE) tests [6].
Electrostatic Septum Limitation
For the SX of partially stripped ion beams, such as the
Pb54+ usedin recentyears, theelectrost... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 2 |
2bfa13ae-bda8-4f9c-b32d-504a77ac74a3 | to be extracted directly by the two magnetic septa. The
additionalbeamlossandinducedradioactivationfromthe
reduced extraction efficiency is acceptable due to the low
the intensity of the ion beams.
Reducing the Beam Energy
ThePFWandW8Larehighlynon-linearcomponentsand
represent a noticeable exception in the new settings... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 2 |
6dd3657d-e371-4650-9c67-2a631f08083b | caninsteadbeachievedthroughthelowenergyquadrupoles
(LEQ), which are not employed during the 24GeV/c opera-
tional proton SX.
Theconductedtestshaveshownthatatlowfields,without
the use of PFW and with the implementation of the new
settingsmanagement, themachine’sscalabilityisexcellent.
This represents a significant achie... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 2 |
347b5a98-4201-49da-ab91-0e3d5e01859c | wereexploredand compared,leadingtothe selectionofan
amplitude-drivenSX schemecalledRF-knockout (RFKO).
ControlledbyanoscillatingdipoleRFfieldonthetransverse
feedbacksystem,RFKOincreasesthebeam’semittanceand
diffuses the particles into the unstable region, as depicted inFig.3,resultinginsignificantamplitudegrowthandenab... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 2 |
379d5850-230e-44f8-9a3e-3d46fc3abd18 | CONCLUSION
In2022,severalimprovementsweremadetotheEASTcy-
cles, driven by the significant progress in understanding SX
onthe24GeV/cprotonbeam. NewLSAparametersarenow
employedtomaintainmachineconsistencythroughoutthe
SX, with the exception of the highly non-linear PFW, which
makes maintaining the optics during extractio... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 2 |
70691461-ad05-4880-861e-c826551f977e | REFERENCES
[1]J.Bernhard,G.Dogru,S.Evrard,R.Froeschl,E.Harrouch,
andM.Lazzaroni,“Chapter3:DesignoftheEastAreafacility
after renovatio,” CERN Yellow Reports , 2021.
doi:10.23731/CYRM-2021-004.17
[2]S. Evrard et al., “CERN’s East Experimental Area: A New
ModernPhysics Facility,” in Proc.IPAC’22 ,Bangkok, Thai-
land, 2022... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 3 |
ea1d8151-f1b0-4d6a-b4cf-a6de4e9b0cb9 | tional Specification.”
[6]M.A. Fraser et al., “Feasibility of Slow-Extracted High-
Energy Ions From the CERN Proton Synchrotron for
CHARM,” in Proc. IPAC’22 , Bangkok, Thailand, 2022,
pp. 1703–1706.
doi:10.18429/JACoW-IPAC2022-WEPOST012
[7]E.Johnson etal.,“Beamdeliveryofhigh-energyionbeamsfor
irradiationexperimentsatth... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA099.pdf | 3 |
36331b3e-739a-41d0-b208-a3903a85dcd2 | PROTECTION OF EXTRACTION SEPTA DURING
ASYNCHRONOUS BEAM DUMPS IN HL-LHC OPERATION
E. Farina∗, M. Atanasov, J. Borburgh, C. Bracco, Y. Dutheil, A. Lechner, J. Maestre,
P. Andreu Muñoz, F.X. Nuiry, P. Schwarz, C. Sharp, P. A. Thonet, R. Franqueira Ximenes
CERN, Geneva, Switzerland
Abstract
TheLHCbeamdumpsystemwasdevelope... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 0 |
6439c40e-670f-4fe9-9235-313e459c5a3d | ifnotproperlyabsorbedbyasystemofbeam-intercepting
devices. IntheHighLuminosity-LHC(HL-LHC)era,the
protectionabsorbershavetowithstandsignificantlyhigher
bunchintensitiesofupto 2.3·1011protons. Inthispaper,we
study the robustness and protection efficiency of the septum
protectionabsorbersforHL-LHCoperation. Inparticular,... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 0 |
8011cc9e-9d78-460c-bf45-da740a1fe5dc | different bunches in the transverse planes [1]. To account
fortherisetimeoftheextractionkickers,thebunchfilling
schemecontainsa3 µs-longregionofemptybuckets,called
abortgap. Duringregularbeamdumps,thekickersarefired
synchronously with the abort gap and all the bunches expe-
riencethesamekickamplitude. Alossofsynchroniz... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 0 |
90717924-70ed-42aa-bd2e-9d7e76b81bbd | septaandprotectstheseptumblade,aswellasthevacuum
chambers of the circulating beam and the extraction line.
The TCDS was originally designed to sustain the impact of
∗edoardo.maria.farina@cern.ch7TeVbuncheswithabunchintensityof1.7 ·1011protons[3].
IntheHigh-Luminosity(HL)LHCera,startinginLHCRun
4 (from 2029), the bunch ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 0 |
7735d032-0bde-42fe-8cdf-c726839ab861 | ABSORBER BLOCK ROBUSTNESS
The TCDS diluter consists of two 3.3 m-long vacuum
tanks,with250mm-longinterconnectingbellows. Ineach
ofthetwotanks,theactualinterceptingdeviceconsistsof
two rows of diluter blocks. The first one aims at protecting
theregionbetweenthevacuumchamberofthecirculating
beam andthe extraction lineof ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 0 |
d33a8190-3724-4da7-b444-6c5b89644e3f | diluter blocks have been optimized to maximize the pro-
tection of the MSD magnets. In particular, the blocks are
slightlytiltedandhaveincreasingthicknesstoaccountforthe
increasing separation between the circulating and extracted
beams[2]. Figure1showsasimplifiedschemaoftheTCDS
absorbingblocks: foreachjawthelength,mate... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 0 |
9d16b6b7-de9c-463d-8634-d7328aec24d7 | absorbers. In particular, the bunch density is minimum in
the region of the TCDS closer to the vacuum chamber of
thecirculatingbeam,andincreasesbymovingtowardsthe
extractionline. Intotal,about 1.7%ofthetotalbeamenergy
may be deposited in the TCDS. In case of HL-LHC, this is
equivalenttoabout12MJ[6]. InviewofHL-LHC,noto... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 0 |
11e8e75d-41b5-4b94-9408-d9aa5512efc3 | Figure 1: Simplified view of the TCDSU and TCDSD ab-
sorbing devices: the block material and density is also re-
ported.
the effectiveness of the device in protecting the downstream
magnets, but also its own survival needs to be assessed in
the worst accidental case foreseen. To address the device
robustness, FLUKA [7 ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 1 |
f4073676-cd70-4762-9538-2f89ccc71af1 | In particular the following energy densities are scored:
•1800 J/g in the low-density CfC absorber blocks.
•1300J/gand900J/gintheisostaticgraphiteinthefirst
and second vacuum tank, respectively.
•450 J/g in the Titanium blocks (730 °C ).
Dynamic thermo-structural finite element studies were
performedforthemosthighlyloa... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 1 |
64c8690a-d6a9-41c2-9e84-31d7c722a430 | materials. Utilisation factors exceeding a value of one indi-
cated the expected structural failure of these blocks under
thespecifiedHL-LHCconditions. Itisthereforenecessary
toreplacethegraphitewithanon-fragileandmorerobustmaterial solution (CfC) prior to HL-LHC operation. Mean-
while,implicitsimulationsofthetitaniuma... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 1 |
6284cc39-0047-43d6-947d-4a6378debf3a | tested in the CERN HiRadMat facility, where, when ex-
posed up to 2.7 kJ/g, the material showed no observable
damage[10]. Toconclude,whilstengineeringstudiesonthe
TCDSareongoing,furtherupgradebeyondthereplacement
of the graphite blocks is not foreseen.
ENERGY DEPOSITION IN THE SEPTA
Downstream of the TCDS, 15 MSD septu... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 1 |
ec31c44c-b6c5-4302-aee3-34bd1beef07b | projection of the TCDS rows on the front of the first MSDA
isalsoshown. Thecalculatedmagneticfieldmaphasthen
beenappliedtothegeometryforeachofthethreeMSDsepta
configurations. Inordertovalidateits implementation,the
trajectoryofaprotontrackedbyFLUKAhasbeencompared
to the LHC expected beam position. Figure 4 shows the
ac... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 1 |
2dbcd963-934f-454a-8cd1-d5f6b492601d | Figure 4: Trajectory study: simulated beam trajectory in
magnetic field is compared with expected trajectory.
Figure5: FLUKAmodelofthefirstMSDAsuperimposed
with the energy deposited. The highest energy density is
scoredintheseptumcore,atthesideofthecirculatingbeam
vacuumchamber. Theadiabatictemperatureincreaseisalso
re... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 2 |
1c930993-24f0-4492-a5ec-b230322f0b3e | areobservedinthedownstreamsepta. Thistemperatureis
not critical concerning a possible change in the magnetic
propertiesofthelamination(upto150 °Cisconsideredas
acceptable). Moreover,problemsinthecoilsareexpectedin
the event of continuous operation at more than 60 °C, while
thisaccidentalcaseischaracterizedbyaninstantan... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 2 |
57376606-7a85-4aa8-9c29-e63ea88c62d5 | madeofstainlesssteel. Figure7showsthemaximumenergy
density deposited in the vacuum chambers, in the copper
(a), in the mu-metal (b) and in the stainless-steel (c), as a
functionofthedistancefromtheTCDS.Thefinalmaximum
adiabatic temperature increase is estimated at 110 °C in the
copper, 95 °C in the mu-metal and 60 °C i... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 2 |
e8fea559-75bc-4d41-920e-482a29d35ec7 | extracted beam vacuum chamber (c).
CONCLUSIONS
FLUKA and thermo-mechanical simulation studies have
been carried out to assess the need of upgrading the septum
protectiondevicetocopewiththeincreaseofbeamintensity
expectedinHL-LHC,incaseofanerraticpre-firingofkicker
magnets. Concerning the TCDS, isostatic graphite needs ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 2 |
bdf30f14-2fd2-41f3-ae56-45481de1afdf | REFERENCES
[1]W.Weterings et al.,“TCDSdilutertoprotectMSDseptum
magnets”, CERN, Geneva, Switzerland, Functional specifica-
tion LHC-TCDS-ES-0001, Jun. 2003.
[2]B. Goddard and M. Gyr, “The Aperture and Layout of the
LHCExtractionSeptaandTCDSDiluterwithanEnlarged
MSDC Vacuum Chamber”, CERN, Geneva, Switzerland,
LHC proje... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 3 |
c669c7ef-c600-4697-a407-e9fb287721c9 | normaloperation”, CERN-THESIS-2011-135,Ph.D.thesis,
Graz, Tech. U., 2011.
[6]C.Bracco et al.,“LBDSPerformanceinRUN2”,in Proc. 9th
LHC Operations Evian Workshop , Evian Les Bains, France,
2019, pp. 131–134.[7]C. Ahdida et al., “New Capabilities of the FLUKA Multi-
Purpose Code”, Front. Phys. , vol. 9, p. 788253, 2022.
d... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 3 |
365b5a5f-9918-4feb-b744-bbb8ac7af38d | IntensityBeamAbsorbers: TheCERNHiRadMat-56-HED
Experiment”, in Proc. IPAC’22 , Bangkok, Thailand, Jun.
2022, pp. 2883–2886.
doi:10.18429/JACoW-IPAC2022-THPOTK049
[11]M. Sassowsky et al., “Steel Septum Magnets for the LHC
Beam Injection and Extraction”, in Proc. EPAC’02 , Paris,
France, Jun. 2002, paper MOPLE083, pp. 25... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA100.pdf | 3 |
ca06a672-c890-41e8-8b4b-ca15f90f07a4 | ENERGY DEPOSITION CHALLENGES FOR THE HL-LHC BEAM DUMP∗
E. Farina†, T. G. Banks, C. Bracco, M. Calviani, Y. Dutheil, A. Lechner, N. Solieri
CERN, Geneva, Switzerland
Abstract
TheLHCbeamdumpsystemhasthetaskofsafelyandreli-
ablydisposingoftheextractedbeamsfrom450GeVto7TeV.
The present dump assembly consists of a multi-seg... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA101.pdf | 0 |
7c4b9c21-d236-4ae3-926b-b036ab0f897f | to ensure safe operation with HL-LHC beams. This work
presents energy deposition studies for the different dump
componentsin case of regular dumps and possible dilution
kicker failure scenarios during HL-LHC operation. The
impactofdifferentdesignchoices,suchastheadoptionof
titaniumasvesselmaterial,ontheenergydeposition... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA101.pdf | 0 |
f39b5fc0-abf9-45a4-a6f6-33e17bb483b1 | extraction channel, where it receives a vertical kick in the
septum field[1]. The dilution kickers(MKB), 4 horizontal
and 6 vertical, sweep the beam over the front face of the
dump in order to reduce the local energy deposition. The
presentTDEiscomposedofamulti-segmentgraphiticcore,
containedinaduplexstainlesssteelvess... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA101.pdf | 0 |
8642f14c-578a-4176-8046-37eeacf815aa | ofthecoreiscomposedofsix70cm-longisostaticGraphite
blocks(1.7g/cm3),oneupstreamandfivedownstreamofthe
low-densitysegment[3]. Fora7TeVprotonbeam,thedump
geometry accounts for about 15 inelastic interaction lengths
∗Researchsupported bythe HL-LHC project
†edoardo.maria.farina@cern.ch(𝑁𝜆). Althoughthedumpabsorbsasignifi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA101.pdf | 0 |
bf0d1d99-5b45-4a46-bb44-12e6357fc6d2 | OPERATIONAL CONDITIONS
ThebeamenergystoredintheLHCincreasedthroughout
the past runs, reaching 380 MJ in 2022, surpassing the orig-
inal design value of 362 MJ. It is expected that the stored
energywillexceed500MJinRun3,oncethetargetbunchin-
tensity of 1.8x1011protons is reached. The operational con-
ditions will become... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA101.pdf | 0 |
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