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abd22d9c-f640-4b34-a114-b5dc54f87812 | Figure 4: Lattice functions for some ofquadrupole settings
(case a, b, c, d from top to bottom, respectively) of the
periodicity five PSR lattice and frozen spin operation.
Simulation Results for Frozen Spin Operation
In Table 3 selected lattice properties are listed and, in
Fig. 4, the Twiss parameters for all the dif... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA086.pdf | 2 |
8a139abc-3d9a-41d3-abeb-a2863057f0da | and the spin tracking results performed with BMAD haveTable 3: Selected Settings and Lattice Parameters Obtained
withthePeriodicityFivePSRLatticeandFrozenSpinOp-
eration
ParameterSettings
a b c d
QE int. gradient (m−1) -0.02 0.02 0.04 0.06
QC int. gradient (m−1) 0.0396 -0.0403 -0.0753 -0.1075
𝑄𝐻 1.8450 1.7808 1.7711 ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA086.pdf | 2 |
d730b994-fbed-4059-8bab-19e35d14c9bc | responding to half the one of COSY. In order to keep the
lengthofthestraightsectionsreasonable,thebendingradius
has been slightly decreased w.r.t. the fourfold symmetry
PSRproposalreducingslightlythebeamenergies. Similar
PSR designs with slightly increased sizes would allow to
increase again the beam energies.
ACKNOWLE... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA086.pdf | 2 |
d180f476-27d4-4250-b8f7-b191266e91cd | REFERENCES
[1]V.Anastassopoulos et al.,“Aproposaltomeasuretheproton
electric dipole moment with 10−29𝑒·cm sensitivity”, BNL,
Tech. Rep., 2011. https://www.bnl.gov/edm/files/
pdf/proton_EDM_proposal_20111027_final.pdf
[2]V. Anastassopoulos et al., “A Storage Ring Experiment to
Detecta ProtonElectricDipoleMoment”, Rev. ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA086.pdf | 3 |
7a0b543e-426f-446a-bb68-8174cb7bb043 | STUDY OF SYSTEMATIC EFFECTS MIMICKING EDM SIGNAL
COMBINING MEASUREMENTS FROM COUNTER-ROTATING BEAMS
V. Cilento∗, C. Carli, CERN, Geneva, Switzerland
Abstract
Optimizationandrealisticestimatesofthesensitivityof
the measurement of charged particle Electric Dipole Mo-
ment (EDM) in storage ringsrequire a good understandin... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 0 |
02f617de-056e-411f-922e-560d67fc57ab | INTRODUCTION
Several schemes to measure the Electric Dipole Moment
(EDM)ofchargedparticlesarediscussedatpresent. Most
of these proposals foresee to run a synchrotron satisfying
the frozen spin condition. This condition requires that, in
the absence of an EDMandwith the well-known Magnetic
Dipole Moment (MDM) in a perfe... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 0 |
15cb420c-5cda-486b-97ad-651e51367272 | the sensitivity, i.e. the smallest detectable EDM, of the pro-
posedexperiment. Suchsystematiceffectsmaybegenerated
by unwanted electric fields owing to imperfections in the
focusing structure, such as misalignments of components,
by magnetic fields penetrating the magnetic shielding or
generatedinsidetheshield(forexam... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 0 |
a83b8c78-1b59-4429-90e4-1499e990fb9e | staticEDMringsandinhybridringswithmagneticfocusing.
Simulations have been carried out for the symmetric hybrid
ring proposal [3].
In most proposals (see, e.g., Refs. [2 –4]), a target sensi-
tivityof10−29𝑒·cmisquoted,thatcorrespondstoavertical
∗vera.cilento@cern.chspinprecessionrateof1nrad/sforthe800mcircumference
sym... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 0 |
91d0afde-296c-4475-b79b-9d767abb22a3 | paper, we will focus on a specific case of a second order
effect, a geometric phase effect, due to horizontal offsets
of bends and longitudinal magnetic fields penetrating the
shield,describedinFig.1. Inthisspecificcasewewillhave
two machine imperfections. The horizontal offsets of bends
will generate spin rotation in ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 0 |
30c2d567-dddc-45cc-b83c-5c2131a0cb7b | LONGITUDINAL MAGNETIC FIELDS
This study includes BMAD [5] implementation of the
symmetric hybrid ring lattice proposal and the study of a
secondordersystematiceffect: thegeometricphaseeffect
due to offset of bends and longitudinal magnetic fields. The
symmetrichybridringdesignhasbeenchosenforthisstudy
because it has in... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 0 |
a3efbfc3-5ae7-4c6c-bf65-d3a025b6e41d | twolocationswithlongitudinalmagneticfields(integrated
fieldsof0nTm,±1nTm,±10nTmand±100nTm). The
strength of the bendings is adjusted such that the deflec-
tion (corresponding, e.g., to a slight change of the electrode
spacing) vanishes. In practice, independent positioning and
strengtherrorswilloccurandgenerateorbitdis... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 0 |
1ff532fa-f7f8-4426-b7b4-8a9b4c9c5f80 | 5 cpEDM MeetingStudy ofsystematic effects : Geometric phase effect
Bending shifted
outwards byxB> 0
àspin rotation in
horizontal planeLongitudinal magnetic field
parallel totrajectory
penetrating shield
àbuild -upofsmall
vertical spin componentBending shifted
inwards by-xB< 0
àspin rotation in
horizontal planeLongitudi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 1 |
b10c0cce-cd92-401c-a4b5-9b740acde06f | magnetic fields of 1 nTm.count for a realistic sensitivity estimate. The effect is in-
dependent on the location of the machine imperfections
provided bending offsets and longitudinal magnetic fields
are interleaved. For the simulation presented here, all im-
perfections are located within a small portion of the ring.
... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 1 |
3cf2a12f-8404-4c9d-bb92-da5575da60e1 | is shown in Fig. 3. Transverse spin components for a proton
with initially longitudinal polarization for different addi-
tionalintegratedlongitudinalmagneticfieldsinplottedin
Figs. 4 and 5. One notes that the residual radial spin com-
ponentafterreadjustingtheparticleenergyisindependent
oftheadditionallongitudinalmagne... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 1 |
a58c62e5-4a73-46a7-906a-803318f4c84a | andreasonablelongitudinalmagneticfieldsaddedwith48
solenoidswithalengthof1mandarandomrms 𝑘𝑆=𝐵𝑠/𝐵𝜌
value of 10−9m−1. In addition, the field of the bendings
hasagainbeenadjusted(electrodespacing)tohaveno(or
negligible) orbit deformation. Then, simulations have been
donewithoutanyfurthercorrectionandafteradjustingth... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 1 |
c3952b35-b36a-435f-bb20-ffa0181ed342 | Figure 4: Horizontal spin build up for the CW and CCW
beams with longitudinal magnetic fields of 1, 10, 100 nTm.
Figure5: Verticalspinbuildupandcomparisonwithanalyt-
icalestimatesfortheCWandCCWbeamswithlongitudinal
magnetic fields of 1, 10, 100 nTm.
beamenergy tostronglyreduce arotationinthe horizontal
plane and then s... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 2 |
d5a38ad9-73ed-4269-90f5-c9ab4f7bef9c | tudinal magnetic field corrections (set the integral over one
turntozero). Infact,bydoingthatwecanseethattheeffect
from quadratic becomes linear as expected and it is equal to
≈3 nrad/s.
CONCLUSION
Geometric phase effects caused by offsets of bendings
andresiduallongitudinalmagneticfieldsinsidetheshield
have been studi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 2 |
844a5d02-352e-4a1e-bf5d-cb2731d1c2bc | hasbeenshownthatthiseffectmimicsafiniteEDM(cannot
be disentangled from EDM combining observations with
CWandCCWbeams). Fromthesimulationsforthemore
realistic case, possibly with still optimistic assumptions, for
alongitudinallypolarizedbeamthereisageometricphase
effect of≈3 nrad/s, 3 times larger than what an EDM of
10... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 2 |
e9e8ae90-5b39-4f6a-bf11-79414388bfdd | REFERENCES
[1]C.CarliandM.H.Tahar,“Geometricphaseeffectstudyinelec-
tric dipole moment rings”, Phys. Rev. Accel. Beams , vol. 25,
p. 064001, 2022.
doi:10.1103/PhysRevAccelBeams.25.064001
[2]F.Abusaif etal.,“StorageRingtoSearchforElectricDipole
Moments of Charged Particles - Feasibility Study”, CERN,
Geneva, Switzerland... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA087.pdf | 3 |
46a85b9f-4d6e-49f8-aebe-f6246ba0128c | CONCEPTUAL DESIGN OF THE MAGNETISED IRON BLOCK SYSTEM
FOR THE SHADOWS EXPERIMENT
F. Stummer∗1,2, D. Banerjee1, A. Baratto Roldan1, J. Bernhard1, S. T. Boogert2, M. Brugger1,
N. Charitonidis1, G. L. D’Alessandro1,2, M. Deniaud2, L. A. Dyks1, L. Gatignon1,3, A. Gerbershagen4,
S. Gibson2, G. Lanfranchi5, F. Metzger1,6, R.... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 0 |
2b43e23b-02a8-46c5-b674-6f2c7cfb03c7 | 6Helmholtz-Institut für Strahlen- und Kernphysik,
Rheinische Friedrich-Wilhelms-Universität Bonn, 53115, Bonn, Germany
7University of Oxford, OX1 3RH, Oxford, United Kingdom
8Physics Department, National Technical University of Athens, 15772, Zografou, Greece
Abstract
SHADOWS[1,2]isanintendedfuturebeamdumpexper-
iment ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 0 |
5302d150-17bf-415b-bb71-fba7f771661d | the beam dump is caused by muons [1]. This introduces
theneedofadedicatedmuonsweepingsystemconsisting
ofmagnetisedironblocks(MIBs)toactivelymitigatethis
background component. We present the conceptional de-
sign studies in the framework of the Conventional Beams
WorkingGroupofthePhysicsBeyondCollidersInitiative
at CERN... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 0 |
8699dd2f-3c60-47dd-8f08-d16f476fdb5c | theSPS)isanintendedbeamdumpexperimentintheCERN
NorthAreathatwouldbeabletosearchforthesedarksector
particles by using the K 12beamline in beam dump mode.
Inthismode,400GeV/cprotonsfromtheSuperProtonSyn-
∗Corresponding author: florian.wolfgang.stummer@cern.chchrotron (SPS) are dumped early in the beamline thereby
potenti... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 0 |
a7066f53-e684-4906-b652-7a44625f78d1 | detector that is about 200m downstream of the beam dump,
SHADOWSwouldbelocatedalongsideK 12. Sinceoff-axis
the backgrounds are typically much lower, this would allow
for its location to be closer to the beam dump.
THE MAGNETISED IRON BLOCKS
Inpreviousstudies[1,10]itwasfoundthatthemainback-
ground at the location of the... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 0 |
672fdd29-9a8f-4843-9c4e-23156eaf6a01 | detector. The purpose of the MIB system is to push these
off-axis muons away from the detector to further reduce the
muon flux rate through the experiment.
TheMIBswouldactonthemuonsintwoways. Onthe
one hand, the stopping power of the iron leads to a decrease
ofthekineticenergyofthemuons. Especiallymuonswith
low momentu... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 0 |
205481a7-4e6a-4e08-87bf-7f7aac26099b | Figure 1: Setup of the MIB system alongside the K12 beamline consisting of Stage 1 and Stage 2 MIBs and detector cover.
Figure2: Conceptualdesignandsimulatedmagneticfieldof
Stage 1 (top) and Stage 2 (bottom). When looking upstream
K12 would be located on the left hand side.
tofalsesignals. Ontheotherhand,themagneticfie... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 1 |
e88bdaad-87e3-490f-a186-b7ea5260d516 | Due to the fact that the location is off-axis no gap for a
beam-pipe is needed.
The software FEMM [11] was used to model the MIB
and calculate its magnetic field, which was then used to
accuratelydescribethemagnetwithinMonteCarloframe-
works. A python framework was created that enabled the
authorsto modifythe MIBdesign... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 1 |
4ff96e84-4257-4f32-9b1a-8a2736cb4b74 | ple already, a deep neural network (DNN) was trained to
predict the efficiency for any given set of MIB design pa-
rameters,whichcouldthenbeusedtofurtherimprovethe
design. The optimisation was done in two steps, so that the
optimisationofStage2alreadytookintoaccounttheimpact
of Stage1. The muon distributions were simul... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 1 |
e72e40f2-12d5-4f35-89ef-882a1312adb0 | startstoworkagainstthemuonseparationbypullingthelow
momentum muons back. Stage 2 will work best if chosen to
be a slim and high MIB with a strong field in all the outer
yokeregions. Thisisduetothefactthatmostmuonsdirectly
afterthebeamdump,andevenmoresothehighmomentum
ones,areusuallyfoundclosetothebeamaxis,meaningthat
a... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 1 |
be7379eb-77cb-4262-99b9-e827fe691f5d | REDUCTION OF THE MUON
BACKGROUND FOR SHADOWS
Allofthecomponentshavebeenassembledinthe BDSIM
modelalongsidetheK 12beamlinetoassesstheeffectiveness
of the background mitigation with Geant4 simulations [14].
The full setup is shown in Figure 1. Stage 1 is placed
alongside the second 3.5m long dipole magnet downstream
the ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 2 |
d3a83595-7785-484a-b4cd-1480858e7fb7 | Muons with momenta between 1 and 100GeV/c, which rep-
resent the bulk of the background, will lose almost 2GeV/c
for every meter of iron they traverse [15]. Therefore, the
15.2m long yoke will stop many muons before they pass
throughandmakeittothedetector. Toshieldthedetector
against muons that miss Stage 2 at its off-... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 2 |
30dc7981-0083-40e1-a331-9f151f0199e9 | event,adequateforaconceptualdesign. Withthesesettings,
asampleequivalentto 1012protonsontargetwassimulated,
which can be used to extrapolate to the 5×1019protons
on target that SHADOWS expects to receive over its full
run-time [1].
The end of the decay vessel of SHADOWS marks the
beginning of the tracking system and th... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 2 |
1d898e88-7575-4373-a00e-5034bd3e218d | the expected muon flux rate from 108/s down to 8×105/s,
which is acceptable for the experiment [1].
FUTURE IMPROVEMENTS
Inthefuture,reducingtheMIBsizewhilstpreservingthe
sweeping performance will be studied. This would avoid
making excavations from the experimental hall and make
space for radiation shielding. Another n... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 2 |
ae09317c-19a1-4caa-9008-68af36a9da89 | SHADOWS was introduced and its performance evaluated.
A first idea of the shape and the size of its constituents was
givenandtheimpactoftheassembledsystemwasstudied
in detail with simulations using the Geant4-based software
BDSIM. It was found that the magnetised iron block sys-
tem can be expected to reduce the muon b... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 2 |
34dc951b-11c7-43e4-b8ee-06da685d53bc | [2]G. Lanfranchi et al., "SHADOWS Expression of Interest",
CERN-SPSC-2022-006, https://arxiv.org/abs/2110.
08025
[3]P. Agrawal et al., "Feebly-interacting particles: FIPs 2020
workshop report", Eur. Phys. J. C 81, 1015 (2021), doi:
10.1140/epjc/s10052-021-09703-7
[4]F. Hahn et al., "NA62: Technical Design Document", NA... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 3 |
4e1c13c9-73b4-4b3e-80f5-17e99b131d68 | PBC-REPORT-2023-001, 2023, https://cds.cern.ch/
record/2847433
[8]M. Fraser et al., "Investigating the feasibility of deliver-
ing higher intensity proton beams to ECN3 at the CERN
SPS North Area", presented at the 14th International Par-
ticle Accelerator Conf. (IPAC’23), Venice, Italy, May
2023 paper MOPA084, this co... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 3 |
cf397c4b-adf7-4bd9-9877-08601cd70a0f | highintensityexperimentsattheCERNP42andK12beam
lines", Royal Holloway, University of London, 2022, https:
//inspirehep.net/literature/2113532
[13]L. J. Nevay et al., "BDSIM: An accelerator tracking
code with particle–matter interactions", Computer
Physics Communications , 2020-252, pp. 107200,
https://www.sciencedirect... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA088.pdf | 3 |
b4a0e77d-fbe1-483f-8ebf-7b6fca8af6b9 | EARTHQUAKE MEASUREMENTS AND THOSE ANALYSIS ON IR
COMPONENTS AND BELLE II DETECTOR IN KEK
H. Yamaoka, M. Masuzawa, T. Kanayama, M. Maki, KEK, Tsukuba, Japan
Abstract
Earthquakes frequently occur in Japan. Even though
countermeasures are thoroughly considered and well
executed, earthquakes still impact facilities a... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 0 |
6c272a6a-f088-4254-b959-6ddd8cacf668 | earthquakes. We then compared the measurements to the
RSA results, which led to an idea for a countermeasure.
INTRODUCTION
The purpose of this study was to understand the cause of
a power shutdown of the superconducting quadrupole magnets (QCSs) at the interaction region of the Belle II
detector, which is located... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 0 |
1a6967e8-9a8a-4edb-8265-7b23e4947541 | on solenoids that cancel the detector solenoid field at the QCS. The size of the Belle II detector is 8 × 8 × 10 m
(length, width, and height, respectively) and its total weight
is 1400 tons. [3]. The power shutdown of the QCSs was expected to be caused by disturbed magnetic fields in the
solenoids, as the earthqua... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 0 |
8ac11e49-9c75-4b0d-acfd-aaaec66dbafe | accelerator design, these displacements and interferences
were taken seriously. In addition, if the displacement reached beyond the acceptable tolerance, it would be
possible for damage to the beam pipe bellows connected to
the QCSs to occur, and interference between the sub-
detectors could also occur if the gaps b... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 0 |
12e74816-2814-4966-b02d-6267184a8dd3 | (Acc-1), and its precision was 0.05 gal. The other was a
servo-type high-precision accel eration sensor (Acc-2) with
10-6 gal precision. These four sensors measured the seismic
acceleration in three directions.
The displacements were measured with the high-
precision sensor (Acc-2) which has 1.7×10-4 mm
integratio... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 0 |
eef8de75-0b68-407c-a55d-ce024b2d3ef0 | and the CDC in the lateral (NS) direction.
Date Intensity
(I) FWD
(mm) BWD
(mm) Difference
(mm)
May 3 1.3 0.0359 0.0364 0.0005
May 5 2.4 0.099 0.104 0.0053
May 9 1.0 0.0371 0.0353 0.0017 May 22 2.4 0.091 0.083 0.0084
The precision of the gap sensors was 0.6 μm, and they
measured the gaps between the QCS cryo... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 0 |
e5f9d180-499b-4764-a2db-426c14f3c320 | wall of the central drift chamber (CDC) in the lateral (NS)
and vertical (UD) directions (i.e., in the plane perpendicular to the beam axis). Table 1 lists the maximum gap
displacements for the earthquak es occurred in May, 2022.
The difference between the maximum gap displacements at the two QCSs were very small co... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 1 |
b2078f27-0921-4d81-b194-603aeb04979b | VERIFICATION OF THE RSA RESULTS
Ground Motion at the Underground Level
After the installation of the acceleration sensors, RSA
calculations were also carried out on the Belle II detector
3D model (Belle II-top) using the ANSYS software package, with the ground motion of the GL-16m as the
input ground motion.
Tabl... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 1 |
244dd3c2-f2b7-4e5f-ba7e-95efc098a10c | Nov. 14 2.3 0.17 0.19 -0.02
For the underground data, the RSA calculations were in
good agreement with the me asurements. The comparison
between RSA the calculations and the measurements in the
NS direction for the earthquak e that occurred on November
9, 2022 is shown in Fig. 2.
MEASUREMENT OF THE SEISMIC
CHA... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 1 |
f0906128-5a74-48e6-a40a-a4351679f85a | that they were almost the same for frequencies below 2 Hz.
Figure 2: Upper panel: maximum displacement for
Belle II-top in the NS direction as estimated by the RSA
calculations by the ANSYS. Lower panel: the displacement measurements for the earthquake that occurred on November. 9, 2022.
For frequencies above... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 1 |
0ac05b45-cdd1-490a-8767-24daf707bec5 | These observations suggest that detectors or any
building with a low natural frequency must be carefully
designed, even if they are located underground. In
particular, relatively large structures should be designed to optimize their natural frequencies in order to mitigate
potential earthquake damage. | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 1 |
03a88e68-23e5-44a3-b677-59e821131063 | MEASUREMENT OF THE RELATIVE
DISPLACEMENT BE TWEEN THE BELLE
II DETECTOR AND THE FLOOR
The relative displacement between the Belle II detector
(Belle II-top) and the underground level (GL-16m) was measured with high -precision acceleration sensors at the
start of a long shutdown period for the SuperKEKB
accelerato... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 2 |
20b1c420-ab61-4c3c-9373-b5a01125803a | displacements are shown as the relative displacements (red lines). In the lateral (NS) direction (perpendicular to the
beam axis), the displacements at both Belle II-top and GL-
16m seem to be in the same phase, as the relative
displacements were smaller than the individual
displacements. However, in the longitudina... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 2 |
16742906-1691-4c0d-9898-c3b0c56d2433 | transform (FFT) was performed. Fig. 5 shows the power spectrum densities (PSDs) of the relative displacements in
the NS and EW directions, as determined by the FFT
analysis. In the NS direction (blue line), no prominent resonant peak was observed. However, there was an
obvious resonant peak at 3.5 Hz in the EW direc... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 2 |
6fe4adc9-db37-46ff-8ff8-70b796ed701f | Belle II detector, and not the QCSs themselves. The RSA results of the Belle II detector model were in good
agreement with the ground motion measured at the
underground level (GL-16m). For the earthquake characteristics, we found th at the acceleration response
spectra at the ground and GL-16m levels were almost the... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 2 |
9fef803c-1b07-4d33-91ef-a639a8c45af1 | develop additional countermeasure ideas to further protect
the detector from strong earthquakes.
ACKNOWLEDGEMENT
I would like to thank Dr. Tauchi at KEK for his useful
advice regarding the seismic data analysis. I would also like to express my gratitude to the Belle II group for giving
me the opportunity to conduc... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA089.pdf | 2 |
5ca5c938-6d66-4b15-b6ff-eb337c200e11 | LATTICE AND DETECTOR STUDIES FOR THE MDI OF A 10 TEV MUON
COLLIDER
D. Calzolari, C. Carli, A. Lechner, D. Schulte, K. Skoufaris, CERN, Geneva, Switzerland
D. Lucchesi, INFN Padova, Italy, N. Bartosik, N. Pastrone, INFN Torino, Italy
F. Collamati, INFN Roma, Italy
Abstract
Amongthepossiblefutureleptoncollidersunderstudy... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 0 |
4e37ef4a-5df3-4cf9-b033-469acf7cb2cf | a cause of long-term material degradation. Therefore, the
machine-detector interface in a muon collider requires a
careful design, integrating massive shielding elements be-
tween the detector and final focus magnets. In this paper,
we devise an interaction region design for a 10 TeV muon
collider with a final focus tr... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 0 |
f221e4b9-2f8b-45a8-9f29-182c15322e74 | hadroncolliders[3]ismuchhigherthaninelectron-positron
machines,butonlyafractionofthecentre-of-massenergy
isavailableinthe collisionsduetothecompositestructure
of the proton (a bound state of quarks and gluons). Muon
colliders [4, 5] offer the benefit of both categories: they
collidefundamentalparticles,withoutbeinglimi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 0 |
23382bff-3539-4e29-948e-cb6f9dbe49ab | radiationdamageindetectorcomponents. Tomitigatethis
phenomenon, past studies[6, 7] withinthe Muon Accelera-
tor Program (MAP) [8] suggested the use of thick conical
shieldingelementsbetweenthelastfinalfocusmagnetand
the detector. These so-called nozzles aim at reducing the
beam-inducedbackground(BIB)byseveralordersofma... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 0 |
d5e9121e-98a0-45a7-bfa1-14f1a4be13b6 | FLUKA [10–12]. As a starting point, we consider the ex-
isting MAP nozzle optimized for√𝑠=1.5 TeV(see Fig. 1).
The magnetic lattice has been designed from scratch [13].
First results of our background studies have been presented
in [14], illustrating the effect of dipolar components in the
final focus region. The dipo... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 0 |
ed57cf3b-c2c4-4d58-b8cb-148f60ff0e29 | thelastmagnet 𝐿∗=6 m,withbetatronfunctionintheinter-
action point 𝛽∗=1.5 mm and a maximum allowed magnetic
field of 20 T at the magnet aperture (see Fig. 2) [13]. In
thedetectorregion,weconsiderauniformsolenoidalfield
of 5 T. The first 10 TeV studies [14] showed that muons
decayinginthenozzleareadonotcontributesignif... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 0 |
9fe7b119-ad70-4956-b688-6689e9513ed8 | Figure2: Finalfocuslatticefora√𝑠=10 TeVmuoncollider.
Top: baselinewith 𝐿∗=6m,bottom: alternativelatticewith
𝐿∗=10m.
100101102103104105
−400 −200 0 200 400
dN/dS [cm−2]
z[cm]6 m: 1 .0×108
10 m: 7 .6×107BIB photons per position of crossing
100101102103104
−400 −200 0 200 400
dN/dS [cm−2]
z [cm]6 m: 9 .1×107
10 m: 5 .7... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 1 |
fa82b271-1b4b-471d-a206-5fcb6f4c4a86 | chinecomponents. Asshownin[14],muondecayswithin
|𝑧|< 𝐿∗contribute several orders of magnitudes less to the
BIB than those in final focus quadrupoles.
In order to assess the impact of 𝐿∗on the BIB, an alter-
nativelattice with 𝐿∗=10 mwasdevised (seeFig.2). The
peakmagneticfieldatthequadrupoleapertureand 𝛽∗was
assum... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 1 |
4d28e4d7-7de0-4203-8972-ae129aabd21b | which were transported down to 10−5eV.
Figure3showsthenumberofphotonsandneutronsper
unit surface entering the detector in proximity of the IP
(|𝑧|<5m); results are given per bunch crossing. The
longitudinal distribution has a similar shape for both lattice
configurations,sincetheprofilesaredominatedbythenozzle
shape. ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 1 |
569b0c35-e20e-409a-a50c-136703d7d3b2 | expressed in cm.
Nozzle Tip
The tip of the nozzle plays a significant role for the back-
ground in the proximity of the IP. While first attempts to op-
timizetheouternozzleshapefor10TeVwereshownin[14],
we present here first background studies for different noz-
zle tip configurations. Several simulations were performed... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 1 |
ebc88370-0941-4cb5-b807-5aaa77cf4c9d | −40−20 0 20 40
z [cm]024dN/dS[1/cm2]×105Photon per crossing position
20deg 1.23e+08
10deg 1.11e+08
5deg 1.05e+08
2.5deg 9.36e+07
1.5deg 8.44e+07
−40−20 0 20 40
z [cm]0246dN/dS[1/cm2]×103Neutron per crossing position
20deg 7.11e+07
10deg 7.08e+07
5deg 7.43e+07
2.5deg 7.19e+07
1.5deg 7.09e+07Figure 5: Photons (top) and n... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 2 |
845e05d6-9950-4dbb-8b61-e0684dc79ef7 | theinnertrackerbyoptimizingtheshieldingconfiguration.
More studies are needed to optimize the entire nozzle shape
for 10 TeV.
DETECTOR RADIATION DAMAGE
Afirstevaluationofthecumulativeradiationdamagein
thedetectorofa1.5TeVmuoncolliderhasbeenpresented
in [15]. By design, the decay-induced power loss per meter
isthesameas... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 2 |
e41e2068-97f3-4f70-8009-1a843f7f5048 | extractedandfullydecaysinthe 10 kmcolliderring. Wefur-
ther assume thatbunches are injected with arepetition rate
of5 Hz, considering 200 days of operation per year. This is
aconservativeassumption,sincethedesignparametersindi-
catethatthedesignintegratedluminositycanbereachedina
−400−200 0 200 400
z [cm]05010015020025... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 2 |
f3ac14ef-e3e0-464d-806b-2f983d338f75 | the1MeV-neutronequivalentfluencemapforoneyearof
operation. Onlythecontributionofonebeamisshown. The
results indicate similar Φ𝑛𝑒𝑞values in the inner tracker as
for the 1.5 TeV collider. This is a promising observation,
indicating that thedifferent decay spectrum at 10TeV does
not significantly worsen the expected ra... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 2 |
5c9f8729-bb88-447a-92c1-9107a83881f5 | componentsinthefinalfocuslayout,weconcludethatthe
lattice design offers a limited potential for mitigating the
background. Another possibility for optimizing the physics
performance at 10 TeV is the nozzle design. The simula-
tionsindicatethatevenasmallmodificationofthenozzletip
affectstheparticlemultiplicityaroundtheI... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 2 |
9b8090c2-e34b-494a-a10e-4aecdaf28e27 | REFERENCES
[1]P. Bambade et al.,The International Linear Collider:
A Global Project , 2019, doi:10.48550/ARXIV.1903.
01629
[2]O. Brunner et al.,The CLIC project , 2022, doi:10.48550/
ARXIV.2203.09186
[3]L. Evans and P. Bryant, “LHC Machine,” JINST, vol. 3,
no. 08, S08001, 2008, doi:10.1088/1748-0221/3/08/
S08001
[4]H.A... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 3 |
055f0f3f-b578-47f3-9e2a-79e59fbb3280 | colliders,” Phys. Procedia , vol. 37, pp. 2015–2022, 2012,
doi:10.1016/j.phpro.2012.03.761
[8]M. Palmer, “The US muon accelerator program,” arXiv
preprint arXiv:1502.03454 , 2015.
[9]D. Schulte, “The International Muon Collider Collabo-
ration,” in Proc. 12th International Particle Accelerator
Conference (IPAC’21) , Ca... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 3 |
11baa2ca-15df-474e-8e94-d284d2acb279 | 10.3389/fphy.2021.788253
[12] Fluka,https://fluka.cern/ .
[13]K. Skoufaris, C. Carli, and D. Schulte, “10 TeV Center
of Mass Energy Muon Collider,” in Proc. 13th Interna-
tional Particle Accelerator Conference (IPAC’22) , Bangkok,
Thailand, 2022, paper MOPOTK031, pp. 515–518, doi:
10.18429/JACoW-IPAC2022-MOPOTK031
[14]... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA090.pdf | 3 |
c7bd04a1-24ab-4dfc-aa53-b2151a4dc9e4 | THE STATUS OF THE INTERACTION REGION DESIGN AND
MACHINE DETECTOR INTERFACE OF THE FCC-ee∗
M. Boscolo†1, A. Ciarma1, F. Fransesini1, S. Lauciani1, F. Bosi2, F. Palla2, A. Novokhatski3,
T. Raubenheimer3, M. K.Sullivan3, A. Abramov4, K. D. J. André4, J. Bauche4, M. Benedikt4,
G. Broggi1,4,5, H. Burkhardt4, J.C. Eriksson4,... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 0 |
cba50918-2a28-4308-9551-a606d676c6f1 | tionregion. It representsamajor challengefor theFCC-ee
collider, which has to achieve extremely high luminosity
over awide range ofcentre-of-mass energies. The FCC-ee
willhosttwoorfourhigh-precisionexperiments. Thema-
chineparametershavetobewellcontrolledandthedesign
of the machine-detector-interface has to be carefull... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 0 |
b3411a03-f9ae-4866-ac4e-a5042bf1644b | theengineeringdesignofthecentralbeampipe,andother
MDI components.
INTRODUCTION
FCC-ee is a high luminosity and high energy circular
electron-positron collider with an optimised circumference
of almost 91km, to be built in the Lake Geneva basin. Its
physics goals are to carry out precision studies and searches
for rared... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 0 |
2c9d650a-f35d-4daf-ac28-90c591136d7f | (SR), albeit at much lower beam current. The most relevant
parameters for the interaction region (IR) design of FCC-ee
are listed in Table 1. The general collider layout is shown in
Fig. 1.
∗This work was partially supported by the EC HORIZON 2020 project
FCC-IS, grant agreement No. 951754.
†manuela.boscolo@lnf.infn.it... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 0 |
9f2c2f42-ccda-43b6-8643-af2a58fb1117 | reducesthehourglasseffect,andallowsthe 𝛽𝑦attheinter-
actionpoint(IP)tobesmallerthanthebunchlength. This
scheme requires a small horizontal beam size and a large
crossingangleattheIP,setto30mradallowingthebeamsto
enter/exit with separate beam pipes at about 1.2m after the
IP.So,theinitialfinalfocusdefocusingquadrupole... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 0 |
670a84ee-0bbb-4002-bcd1-6cd9350b07c0 | OutsidetheIR,theFCC-ee,theboosteraswellasthesubse-
quentcollider,FCC-hh,willallbehousedinthesametunnel
thathasaninnerdiameterof5.5m. Theboosterhastoby-
passtheFCC-eedetectorattheIPwithatransverseoffsetof
at least 8m. In addition to the SC Final Focus Quadrupoles
(FFQ), the IR magnet system comprises a compensating
sole... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 1 |
0d986129-6634-475d-9b41-6b3442955e70 | 2Tinordertokeeptheblow-upduetotheresidualdisper-
sionandsynchrotronradiationinthesolenoidfringefields
atanacceptablelevel,namelyatafractionofthenominal
∼1pm vertical emittance. Just in front of the compensating
solenoidssitsaluminositycalorimeter(lumical),whichis
designed to measure the luminosity to an absolute precis... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 1 |
5ceef1f8-1f5a-40da-9af7-21b809798fc3 | rection sextupoles ate located at 497m before and 118m
after the IP. These magnets are all be superconducting. Be-
forefurtheradvancingwiththemagnetdesign,themultipole
errortolerancesandmaximumintegratedfieldstrengthneed
to be confirmed. The FFQ IR magnets are based on the ma-
Table 1: Preliminary Key Parameters of FCC... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 1 |
53227c6f-fb48-453b-b53b-d2821a8d464e | Rms hor. emit. 𝜀𝑥[nm] 0.71 2.16 0.64 1.469
Rms vert. emit. 𝜀𝑦[pm]1.40 4.32 1.29 2.98
Hor. IP beta 𝛽∗
𝑥[mm] 110 200 300 1000
Vert. IP beta 𝛽∗
𝑦[mm] 0.7 1.0 1.0 1.6
Lifetime*[min.] 22 17.8 10 12.3turecantedcoiltechnologyrecentlydevelopedandproduced
inseriesontheCERNHL-LHCproject[8]. Furthermore,
a combined direct... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 1 |
c1bf63f4-6c24-4957-9119-b996e763fb48 | An horizontal SR mask is placed after QC1, at 2.12m from
theIP.AcircularmaskisforeseenbetweenQC2andQC1,
as the physical aperture is reduced from 20 to 15 mm ra-
dius. ThepresentgeometryoftheIRbeampipediffersfrom
the CDR design mainly by the inner radius of the central
inner pipe, which now is 10mm instead of 15mm, allo... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 1 |
46e96d14-3ae5-4574-b2da-6ae139512ebd | mostpartofthecentralchamberanduntilthelumical,water
cooling is considered, with the help of asymmetric thick
copperchannelsdepositedontheAlbeMet162trapezoidal
chamber [10].
We have engineered the very central region of the IR, as
showninFig.2. Themechanicaldesignincludesthevacuum
chamber with the cooling system, the be... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 1 |
03640c2f-f86b-4c3b-921e-9d1b86de8ccb | sequence for this central region. Two bellows on either side
of the IP are designed adapting the ESRF design [11] to
the small longitudinal space available, about 70mm. An
evolution of the detector IDEA concept has been studied to
integrate the silicon tracker in the IR. It features a vertex
detector, closer to the bea... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 2 |
1fc18789-4ac9-416d-a714-17f881c1795e | quency Scanning Interferometry (FSI), and an internal one,
based on innovative in-line multiplexed and distributed FSI
monitoring portions of fibers placed in helices shape along
thesupportsofthescreeningandcompensatingsolenoids
[12]. We have recently proposed a complementary R&D ac-
tivityofafull-scaleIRmock-uptoberea... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 2 |
1c5181c8-f953-4eee-aeb6-0a8e7642b46d | tails plays an important role in the latter magnetic elements.
The transverse beam tails are difficult to predict and depend
on the stored beam conditions. The study is perfomed with
BDSIM [13], utilising the GEANT4 [14] toolkit.
Thesimulationmodelstartsfromthelastdipoles,andit
includes the solenoid and compensating so... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 2 |
69211e41-c18f-4167-8ac6-dc190a434f1e | field hit mostly 65m downstream the IP. The SR from the
FFQ and solenoid fringe field lead to an increasing power
deposition near the IP as the transverse beam tails widen.
SRcollimatorshavebeenimplementedintheIRregion
tointercepttheradiationupstreamoftheIR.Theirpositions
areshowninFig.3. Theblueandredfilledcurveshighl... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 2 |
754436a1-96a5-4bdf-a23b-ed11fe51e81a | with the 10mm radius central beam pipe and with the
solenoidalfieldmaptoevaluatetheoccupancyintheCLD
from SR, beam losses and IP backgrounds. Results are
encouraging [18], the maximum occupancy per bunch
crossing is below the safe 1% level, which is also consistent
with the CDR studies [19,20].
RADIATION FROM THE IR
Th... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 2 |
11bb3e12-5c53-4825-84b5-1aba9053b8a4 | chamber inside or behind the first bending magnet at about
65mfromtheIP.Ahigh-powerphotondumpisnecessary
to dispose of this radiation, as well as all the other radiation
produced at the IR. Studies performed with GuineaPig++
show that the photon line is separated by the electron beam
line by 1m at about 250m, and that ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 3 |
55abe889-297e-4402-9b39-448f829965af | isencouraging. WehavealsoreviewedotherMDI-related
studies such as the handling of beamstrahlung and the early
conceptual design of a photon dump, located downstream
of the IR, for this intense radiation.
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033ea55e-2e8c-44d4-a13e-187da063b0a8 | doi:10.1140/epjp/s13360-021-02031-5
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for the FCC-ee”, in Proc. IPAC’22 , Bangkok, Thailand, Jun.
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... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 3 |
cb53ba14-c4e5-4a3c-9f1e-cb0a6f8fe86e | [19]G.Voutsinas et al.,“FCC-eeinteractionregionbackgrounds”,
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[20]M.Boscolo et al.,“MachineDetectorInterfaceforthee+e-
Future Circular Collider”, in Proc. eeFACT’18 , Hong Kong,
China, Sep. 2018, pp. 201.
doi:10.18429/JACoW-eeFACT2018-WEXBA... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA091.pdf | 3 |
a3cb026c-1314-400b-84ae-5223b13d5188 | ESTIMATED HEAT LOAD AND PROPOSED COOLING SYSTEM IN THE
FCC -EE INTERACTION REGION BEAM PIPE. *
Alexander Novokhatski †, SLAC National Accelerator Laboratory, Menlo Park, CA, U SA,
Manuela Boscolo, Francesco Fransesini, Stefano Lauciani and Luigi Pellegrino,
INFN -LNF, via E. Fermi 54, 00044, Frascati, Italy
Abs... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 0 |
0c1afabd-0a35-4943-ad25-0e28a48847a2 | sent t he cooling system design and results for temperature
distribution in interaction region in the operational mode.
INTRODUCTION
It is planned that a future e+e− collider (FCC -ee) will
have a very high energy, up to 375 in the center of mas s
and unprecedented luminosities [1]. To achieve high lumi-nosity, ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 0 |
a7dbfcc1-4e4e-4964-9169-9fde2a055e19 | the intersection of four beam pipes and present a very com-
plicated inhomogeneity geometry. Both beams generate electromagnetic fields in IR. Depend ing upon the bunch
spacing frequency, this may lead to a resonant excitation
of a trapped mode located in some special places.
Another heating effect is an excitati... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 0 |
4a9ad833-7722-4490-a2aa-cd32bf0ca4ff | calculations. In these calculations we assume that the beam
pipe materials have infinite electrical conductivity. Now
the engineering design of the IR suggests what kind of ma-
terials will be used. Using the correspondent conductivity of the materials we calculate the heat load distribution along IR beam pipe.
... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 0 |
d0e9ede8-6e1f-4479-85f2-ae0c70c5cc8e | when fields are excited and absorbed in some trapped lo-
cations. Your cannot avoid one mode located near the pipe
connection [2]. Under resonant conditions the amplitude
of the trapped mode field can be strongly magnified. The third type is an unavoidable resistive -wall wake field ,
which is responsible for d... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 0 |
909d1269-6c18-47bf-a8fc-9072c66318ba | lose more energy. The impedance is a Fourier spectrum of a wake potential. The wake potential is an integral of the
longitudinal electrical component of the excited fields
along the bunch trajectory. The impedance shows possible
trapped modes as resonate spikes in the frequency spec-
trum.
CONCEPT OF A LOW IMPEDA... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 0 |
69d18458-3806-4636-b9c7-462874396946 | combine two half -ellipses in one full ellipse making one
________________________________ ___________
* Work supported partially by US DoE, Contract No. DE-AC02 -
76SF00515 , and by the EC HORIZON 2020 project FCC -IS, grant
agreement n.951754 .
† novo@slac.stanford.edu | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA092.pdf | 0 |
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