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fc65cd47-0354-4596-a16e-e5b2c16a1861 | isotopes are extracted on line from these targets to experi-
mental stations in the PTF.
The FPF houses an irradiation rig for fusion exper i-
ments. The FPF target can take up to the full 4 mA of beam.
The ETBD will be used during first commissioning of
the accelerator and during beam tuning at reduced duty fac-... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 0 |
8980d1eb-0e37-4e52-8dcc-6e3349e7780b | constant beam) and the maximum pulse width to PTF is
fixed to 0.490 ms.
Table 1 describe s the beam distribution scenarios in the
HEBT : (1) simultaneously to the ETBD and PTF, (2) both
PTF and FPF receive beam (3) only the PTF and (4) only
the FPF receives beam, which can go up to the full beam
intensity (puls... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 0 |
4caf3a01-8a75-4e67-a82b-95d7e822ad28 | kicker operates at a maximum repetition rate of 250 Hz and
with a kicker strength of 7.7 mrad for 100 MeV protons.
________________________________ ____________
* Work supported by the Belgian state, 7 September 2018
† perrot@ijclab.in2p3.fr | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 0 |
24e6373d-3e2f-41d6-aabc-79bd4a792cba | The kick duration is maximally 0.49 ms and minima lly
0.01 ms, corresponding to the maximum and minimum
pulse width which can be delivered to the PTF targets.
Thank s to the additional quadrupole , the beam enter the
first septum magnet at 70 mm offset from the straightfor-
ward beam line (the TS + FP line). Figu... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 1 |
f886fedd-b03b-4ef8-8dc3-18925b3fba05 | overall beam pipe aperture of the HEBT lines is kept at 82
mm except a t some locations (dipoles and septa ). In the
septa magnets, the vertical gap is reduce d to 30 mm in or-
der mini mize its electrical power consumption . With help
of the last three quadrupole s, the 1s beam size on the PTF
target can be ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 1 |
dc09673c-aa3a-4017-a9e3-5546b2b02d1f | (com mon with the FP line), a space reservation is kept for
a future rebuncher cavity required to inject into the 2nd part
of the accelerator (MYRRHA facility ). The rebuncher cav-
ity impose s additional constraints on the vertical beam size,
since the full apertu re is limited to 5 6 mm.
The 1 s beam spot size... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 1 |
5fcb2b10-f063-4479-a4be-b61250b94cdf | quadrupole triplet in between. A shielding wall is located
in the deviation section . In the final straight line, a quadru-
pole triplet is foreseen to vary the 1s beam size on the FPF
target from 5 mm up to 25 mm . The bottom part of Fig . 3 shows the 6s beam enve lopes
in the FP line together with the beam pipe ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 1 |
25b2f843-dd1d-4cd1-b044-ebc3e521f30b | is available in Fig . 1. The dashed rectangle indicates the
last cryomodule of the accelerator containing one quadru-
pole doublet. In grey: the beam pipe apertures. Upper and
lower envelops refer to the horizontal and vertical direc-
tion, respectiv ely.
ELEMENT SPECIFICATIONS
For the HEBT lines (TS, PT and FP... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 1 |
73d00256-6759-4ff2-b776-c765e1990415 | Orbit correctors will be incorporated in selected quadru-
poles. Error calculations show that a maximum integrated
field strength of 7 0 G.m should be foreseen. This is bas ed
on the 5 s value of needed corrector settings for 1000 dif-
ferent error cases . The errors are uniformly distributed :
±0.2 mm beam alig... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 2 |
7edf3474-2daf-4f45-9016-3ed603957de9 | grated strength of about 0.012 T.m. The timing properties
of the kicker magnet are rather tight and are currently being
assessed for technical feasibility. Rise and fall times for the
kicker are set to 5 µs with a tolerated field stability during
the flat top of 1% and 2.1% in the post -pulse ripple. These
values ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 2 |
361a0702-0533-47b9-8a59-d99ef8bab4a1 | length of about 1.0 m, resulting in an integrated field
strength of about 0.28 T.m for a bend angle of 10.757 °. The
vertical beam envelope is kept very small at the position of
the septa magnets (see Fig. 3) to keep the vertical gap size
of the septa magnets minimal.
The rastering magnet system is currently und... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 2 |
6934f629-0570-4761-aff8-80cdf080e202 | rated . An ACCT BCM is placed immediately after the last
cryomodule to assess the trans mission through the ac celer-
ator. Subsequently, a BPM [7, 10] is placed i nside the first
quadrupole of the first doublet in the TS line ( see Fig. 3),
a halo monitor i s placed immediately after the 1st quadru-
pole and spa... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 2 |
e9807e26-8316-4639-b83e-43654bb4b18d | Figure 4: Beam diagnostics position in the HEBT lines.
Beam Position Monitor (BPM ), Halo monitor (HALO ),
Beam Current Monitor (BCM ), Wire scanner (WIRE ).
Currently, 14 BPM’s are positioned close (or inside ) to a
few selected quadrupoles. 5 halo monitors are posit ioned
to assess the presence of beam hal... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 2 |
318183db-5e89-4f10-94cb-fd19fc06f110 | elements (1quadrupole and 2 rastering magnets) are very
close to the wall, which is about 6 m long and a large beam
size should be reached on the FPF target. The wire sca nners
after the 1st dipole towards the PTF and FPF serve as well
as diagnostics for any beam energy deviation during beam
tuning. 2 wire scanner... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 2 |
7696609c-2773-4562-8dc8-5ef941b93b65 | [2] MYRRHA Accelerator eXperiment, research and develop-
ment programme, https://cordis.europa.eu/project/id/ 662186
[3] D. Uriot et al., “Beam simulation code development, global
coherence - Start to End Model of the 100 MeV
MYRRHAlinac”, MYRTE D2. 6
[4] A. Plaçais and F. Bouly, “Cavity Failure Compensation
Stra... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 2 |
277dd2d0-3978-4b60-a31a-85cde9a5c39c | [6] H. Kraft and L. Perrot, “Beam Dynamics and Diagnostics
for the High Energy Beam Transport Line of MIN ERVA
Project at SCK•CEN”, in Proc. IPAC'19 , Melbourne,
Australia, May 2019, pp. 2304 -2306.
doi:10.18429/JACoW -IPAC2019 -WEPMP003
[7] H. Kraft , “Etudes de la dynamique faisceau et d’un diagnos-
tic de pos... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA011.pdf | 3 |
ba4c59a9-ebc1-4f20-86da-2075256bb672 | DESIGN AND OPTIMIZATION OF AN ERL FOR
COOLING EIC HADRON BEAMS
C. Gulliford∗, J. Conway, D. Douglas, B. Dunham, R. Eichhorn, V. Kostroun, C. Mayes,
K. Smolenski, N. Taylor, Xelera Research LLC, Ithaca, NY, USA
E. Wang, W. Bergan, A. Fedotov, D. Kayran, Brookhaven National Lab, Upton, NY, USA
S. Benson, K. Deitrick, Tho... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 0 |
d2398290-cea3-435b-af5a-f4ded63f204c | on the order of 1 nC and average currents on the order of
100 mA and requiring an Energy Recovery Linac (ERL) to
producesuchbeams. UsingspecificationsprovidedbyBNL
and JLab, physicists and engineers at Xelera Research are
working on a complete design of an ERL system capable of
cooling EIC hadrons.
INTRODUCTION
The Ele... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 0 |
768e1f49-134d-413d-b3ec-ec66261018c2 | fectssuchasintra-beamscatteringandthebeam-beameffect
causing degradation of the hadron beams. Thus it is desired
to cool the hadron beams using electron beams provided by
a separate accelerating system.
In this collaboration, EIC scientists have provided the
ERLspecificationsrequiredforefficientcooling,3DCAD
layouts of... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 0 |
e8767de6-2431-452b-b888-27f664bd2269 | ing the low energy, space-charge dominated sections of the
machine(s). All initial particle distributions were generated
usingDistgen,anopen-sourcepythonpackageforcreating
particle beams [3].
∗colwyn.gulliford@xeleraresearch.comSHC-CeC ERL
The Coherent electron Cooling mechanism for cooling
hadronbeams wasfirstproposed... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 0 |
5c119444-1f09-46d4-87dd-5e2dccf28ca9 | The primary result of this effort is a complete physics
model of the EIC SHC-CeC ERL with a corresponding
3D model placing the machine in the BNL facility. An
elevated view of this layout is shown in Fig. 1. The relevant
mainsections,inbeamlineorder,aretheinjectorfeaturing
a400 kVDCgun, as wellasa 591MHz SRFboosterand
... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 0 |
be495302-7241-4438-b091-55491bfd701e | straints on path length and beam optics (e.g., 𝑟56, average
beta functions). Several other beamlines exist in the area,
includingtheRapidCyclingSynchrotron(RCS)anditsin-
jector,theelectronstoragering(ESR),andtheRHIChadron
beamlines.
-200 -100 0 100 200 300
Z(m)-60-40-20020X(m)
INMGLAHMC1C2 C3 C4 C5 C6C7 HDTAR1R2
R3
R4... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 0 |
c4ad94aa-ed80-434e-a8b5-89058afd20f3 | Acomplete,closedopticsdesignfromcathodetobeam
stop has been created for the high energy operation mode
ofthe ERL(cooling 275GeVprotons). Figure2showsthe
latticebetafunctions,dispersionfunctions,andbeamenergy
through the full machine for the “inside tunnel” geometry.
Inadditiontoformingthephysicssolutionshown,theBmad
la... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 1 |
133150da-e41b-444d-a744-a80dd8ddb0b8 | Figure3: Rendersofthe3Dmodelofthecoolerandhadron
beamlines in the RHIC tunnel. Left: the injector, low en-
ergy merge, linac entrance, and return line featuring a Bates
bending system; right: the amplifier and hadron beamline.
COMBINED SHC-CEC AND PRECOOLER
In the summer of 2022, it was decided that the EIC base-
lined... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 1 |
4b24804e-5a47-493c-8f12-1e14646cbd99 | To make both systems compatible requires changing the RF
frequency of the accelerating cavities in the injector from
591MHzto197MHz,andthusrequiresre-optimizingthe
injectorsystem. ThefinalelectronenergyinthePrecooler
is much lower than the electron energies in the SHC ERL
(13MeVvs. 55or150MeV),andthustheelectronsmustbe... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 1 |
5360f03d-eeeb-4a05-bec9-080c3ddbe936 | cooling systems are shown in Fig. 4.
-200 -100 0 100 200 300
Z(m)-60-40-20020X(m)
INMGLAHMC1C2 C3 C4 C5 C6C7 HDTAR1R2
R3
R4
TBMHDU“modulator” “amplifier” “kicker”
electronshadrons
electronsprecooler merger
PLprecoolerprecooler bypass
Figure4: Proposedlayoutfeaturing197MHzinjectorand
Precooler ERL system.
Xelera scienti... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 1 |
b33d8eb8-43ae-40f4-a122-50988b469cbd | tures: a400kVDCgun;two197MHzquarterwavecavi-
tiesand a third harmonic cavity;the mergersection, which
uses chevron dipoles and solenoids with opposite current
to provide axis symmetric focusing and a closed dispersion
function; andtheprecoolerlinac, featuringfour197MHz
quarter wave cavities and two third harmonic cavit... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 1 |
e1488ab8-0bf3-4dfe-bcd1-2ce81903a071 | truncation fraction. The longitudinal distribution is a super-
Gaussian tuned to produce a roughly flat-top distribution.
Theinitialbeamis imported intoGPTand trackedthrough
the injector for four meters. The particles are then extracted
andimportedintotheTaomodelofthemergerandprecooler | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 1 |
3a179031-9dbc-4888-9bc5-b5660530d7dd | booster. In both cases, reasonable beam parameters have
beenfoundbytheoptimizationprocedure. Figure6shows
an example pareto front produced by Xopt for the precooler
bunchparameters. Figure7 showsexamplesolutions from
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0
E (keV)
012345n,x (m)
n,x(95%)
n,x(100%)
Figure 6: Example par... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 2 |
af0a2cfa-f463-4ad5-8ec2-0695ef662774 | total beam energy, Middle: transverse beam size, Bottom:
transverse normalized emittance.
the target emittance of 1.5 µm in the precooler case and
showsthatalthoughthe100%emittanceisslightlyhigher
than desired, the 95% emittance is within spec.
Aninitial solution forthe lattice functions in the cooling
section has also... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 2 |
976430bb-eb85-417b-b856-87f4fa182885 | HDFigure 8: Optics solution in the new cooling section layout.
Here the C2, C4, and C6 sections are tuned to have specific
linear𝑟56transfermatrix terms as requiredbythe cooling
scheme.
for SHC cooling via the CeC process. Additionally, work
is progressing in producing ERL design solutions for the
combinedSHC-CeCERLan... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 2 |
f458f9b8-5d9c-4a49-ae4f-c2ba28fea608 | ParticleBeamSourcesandTechniques. TheFederalGrant
NumberforthisprojectisDE-SC0020514. Wewouldliketo
extendoursincereappreciationtoDr. MichelleShinn,our
program manager at the DOE, for her guidance and support
throughout the project.
REFERENCES
[1]D. Sagan and J. C. Smith, “The TAO Accelerator Simu-
lationProgram”,in Pr... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 2 |
aed45762-2c02-46a2-8bec-fd078f24578c | cooling,” Phys. Rev. Lett ., vol. 102, p. 114801, 2009.
doi:1/zero.alt4.11/zero.alt43/PhysRevLett.1/zero.alt42.1148/zero.alt41
[5]E. Wanget al., “The Accelerator Design Progress for
EIC Strong Hadron Cooling”, in Proc. IPAC’21 , Camp- | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 2 |
52ba8e03-b4d7-4a2a-9a40-f94bb635bc38 | inas, Brazil, May 2021, pp. 1424–1427.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt421-TUPAB/zero.alt436
[6]E. Wanget al., “Electron Ion Collider Strong Hadron
CollingInjectorandERL,”in Proc.ofERL’22 ,Ithaca,
NY, USA, 2022.
[7]Free,opensource3DcreationsuitebytheBlenderFoun-
dation, https://www.blender.org[8]C. Mayes, R. ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA016.pdf | 3 |
9e5201b5-bad8-4661-8300-809946ae3e2f | HIGH ORDER MODE ANALYSIS IN ENERGY RECOVERY LINAC BASED
ON AN ENERGY BUDGET MODEL
S. Samsam∗, M. Rossetti Conti, A.R. Rossi, A. Bacci, V. Petrillo1, I. Drebot,
M. Ruijter, D. Sertore, R. Paparella, A. Bosotti, D. Giove and L. Serafini
INFN - Sezione di Milano, Milano and LASA, Segrate (MI), Italy
A. Passarelli, M. R. M... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 0 |
8ed8d251-6565-470f-9e34-a2f330777972 | bunchesaresupportedbyastandingwavestructureofthe
RF cavity. The analysis reported in this paper is based on
differentialequationsthatdescribethebeamdynamics(BD)
to overcome the limitations imposed by high currents and
insure energy recuperation over millions of interactions.
INTRODUCTION
ERLshavearelativelyfascinatingh... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 0 |
d890fb3a-8020-492e-a8ca-662da8994e54 | sonNationalAcceleratorFacility(JeffersonLab)intheearly
2000s and demonstrated the feasibilityof the ERL concept
for the generation of intense high-quality electron beams [3,
6]. Sincethen,severalotherERLfacilitieshavebeenbuilt,
including the ERL Test Facility (ERLTF) at Brookhaven
National Laboratory and the Cornell-BN... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 0 |
e0515fca-155e-491f-9b8d-08c70bd7f988 | ofanelectromagnetic(EM)fieldresonantinthelinacduring
acceleration; when utilized as a decelerator, the EM field
getsenergyfromthebunch. InthecaseofERL,electrons
are not reused but only their energy. As a consequence,
the electron generating light at the current point is not the
∗sanae.samsam@mi.infn.itsame as it was on... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 0 |
510e95ca-9963-48f8-870f-dee7a5aa4a98 | generatingX-RAYbasedoninverseComptonscatteringand
aTHzradiationsourcebasedonclassicalundulatorsandop-
tical cavities, respectively. Notably, SC cavities are of great
importance in this study due to their ability to accelerate
beams with high repetition rates and large average currents.
However, SC technology can lead t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 0 |
309cee86-3219-40f2-96ef-cf34b1c49ec3 | accelerationinsubsequentpasses. However,notallofthe
beam’senergycanberecoveredduringthedecelerationpro-
cess,leadingtoalossofenergyandareductionintheoverall
efficiency of the ERL. There are several approaches to miti-
gate the energy loss in ERLs and we can cite here four main
mechanisms. Optimizationoftheenergyrecover... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 0 |
56672cbc-e8da-4915-8708-9eaf0b5d76db | which convert the kinetic energy of the beam into electrical
energy that can be fed back into the power grid. The last
mechanism would be the use of SRF cavities to improve
energy recovery efficiency by providing a high accelerating
gradient and minimizing the beam losses due to wakefields
[24]. Bycombiningtheseapproac... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 0 |
ab45e11e-ae43-48ed-b59a-037793064f3d | deceleration in an ERL can be minimized, leading to higher
overall efficiency and greater energy recovery.
Inourstudy,byimplementingSCcavities,wenumerically
solvedthis energyloss problem using the set of differential
equations provided by the HOMEN model [15, 23, 25, 26].
We can recall the stored energy expression of t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 1 |
824dd1c0-1502-4a40-a225-c53388680358 | energyrecovery,inotherwords,thestoredenergyinsidethe
cavitymustalwaysbethesameattheentranceandexitofthe
cavity over a long time-scale. Supposing 1J of initial stored
energy, we accelerate the first electron bunch (point-like
bunch)intime 𝑡 = 𝜏,thendeceleratethecomingbackbunch
in the same cavity with opposite phase in... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 1 |
8a55e1f5-d8b8-4061-8a85-60d6e2e4de7e | the system for the operation of beam acceleration, therefore,
we suppose that 𝑃Kly= 𝑃dissto compensate the power loss.
Figure 1: Missing energyin one cavitycycle. 𝑈0is the
initial stored energy of the cavity. 𝑈1is the stored energy
remaining after the acceleration and 𝑈2is the final energy
of the cavity after dece... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 1 |
24473fa9-da05-4c9c-abe9-e8b52bb45bb3 | sustainability. By injecting approximately 2×105bunches
intheERL.Thecomputation resultsshowthestoredenergy
inside the system will vanish in time as presented in Fig. 2.
Figure2: Storedenergyloss in ERL based on one 7-cell SC
cavity.
To overcome this disequilibrium of the ERL working
mode, one can rely on the solutions ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 1 |
35382960-6e06-43f1-a55f-1688134aff08 | 0.7Wofadditionalpowerthatmustbesuppliedtothesystem
to maintain its stability. Specifically, the HOMEN model
was developed to ensure that the ERL can sustain its operat-
ingmodeoverbillionsofinteractionsandforlongperiodsof
time. Following this new assumption, it has been found that
themethodutilizedtoguaranteetheregular... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 1 |
50171b2c-7b08-43a8-aaf2-10e683414a9c | length of BriXSinO’s arc, the bunch is injected in this case
with𝛾= 10 (5 Mev); during the acceleration inside the first
cavity, the bunch gains an amount of 13.4 MeV arriving
at𝛾= 36.2. After a time 𝑡𝑠≈2.68 ns, which corresponds
tothetimetocrossandreachthesecondcavity,thebunch
will be accelerated again reaching 𝛾... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 1 |
02b57108-9e2e-4dc2-bf59-b734b9161a6e | Figure 3: Variation of the bunchenergygaintaking into
account an initial energy of 5 MeV ( 𝛾=10). The ERL is
composed of 3 coupled 7-cell SC cavities.
Table 1: ERL Beam Parameters
Target parameter Unit Value
Injection energy MeV 10
Average beam current mA 5
repetition rate MHz 100
Bunch charge pC 50
Flight time ns 5
C... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 2 |
590ce38c-5199-4304-a1ca-3f25f5e00079 | PRESENCE OF HOM IN ERL
The bunch energy gain refers to the change in the kinetic
energy of a beam. In the presence of HOMs, the bunch
energy gain in ERLs can be affected leading to a loss of
thebeamenergyduetotheenergytransferfromthebeam
to the resonant modes [27]. This can cause an increase in
theenergyspread ofthebea... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 2 |
095ed491-8c49-4cb3-9494-b99b1f909dbb | beam quality, accurate simulations of the wakefield have
been done to achieve a reliable evaluation of the variation
of stored energy in the cavity as well as of the bunch energy
distribution. Depending on previous studies in these Refs
[23, 25, 26], we add the loss factor 𝑘𝑙𝑜𝑠𝑠contribution to Eq.
1. We evaluate b... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 2 |
68128100-0b8f-417a-b2fe-cc8a2abde483 | at the cavity entrance experiences no energy gain due to
the absence of stored energy required to evaluate HOMs.
However,subsequentbunchesbegin toaccelerate andgain
energy (as indicated by red arrows) or decelerate and lose
energy (as indicated by blue arrows), depending on their
injection phase.
Figure 5: Accumulated ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 2 |
ed557a8f-ef65-4303-aac7-5ad944543b29 | inginabeamdegradationofapproximately ±3×10−3. This
value was obtained under the worst-case scenario, where an
undamped HOM with the highest 𝑘𝑙𝑜𝑠𝑠value in a 7-cell SC
cavity was considered.
CONCLUSION
HOManalysisinatwo-passtwo-wayERLschemehasad-
dressedthechallengeofmissingenergyduringLinac’srecov-
ery operation. T... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 3 |
623e0b47-6d15-446b-89fb-9cc878ac127e | REFERENCES
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[2]W. ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA018.pdf | 3 |
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441a9ce5-b59d-4f52-bf3f-ef05af85c130 | [9]J.Gulliford etal.,“Experimentalresultsfromthecornell-bnl
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720934b0-f41b-4b99-b078-b7e840975cb5 | electron laser oscillator,” New Journal of Physics , vol. 22,
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73aa9894-d1a3-4282-b584-d2ab7fc90eef | ACHROMATIC LOW ENERGY MERGER FOR
ENERGY RECOVERY LINACS
M. Rossetti Conti∗, A. Bacci, D. Giove, S. Samsam, D. Sertore and L. Serafini,
INFN - Sezione di Milano, Milano and LASA, Segrate (MI), Italy
Abstract
Nowadays,EnergyRecoveryLinacs(ERLs)becamere-
allyappealingthankstotheirlowenvironmentalimpactand
high sustainabil... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 0 |
b54c11c4-adc9-416e-9a34-25fc45cb3ce4 | have been studied to address this problem.
Here we present a different approach that allowed us to
exploitastandarddoglegtodesignaverylowenergymerger
foranERL.Thishasbeenmadepossiblethankstotheappli-
cation of the GIOTTO AI code that optimizes of the optics
setting finding a proper achromatic configuration.
INTRODUCTIO... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 0 |
4fdc2e55-f667-463e-b84d-c633b652e2dc | on the neutron production, leading to further complications
fromtheradiationprotectionpointofview. Nowadays,many
acceleratorsfacilityprojectsarebeginningtoconsiderERLs
as asolid solution[1]. This trend islargely attributableto
thehighenergy-efficiencyofthesekindsofmachines,which
offerexceptionalbeamfluxperformancethatw... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 0 |
56aaba9e-2237-46d5-9443-63574e04805c | 𝑃dump=𝐸0·𝑓·𝑄𝑏
𝑒(1)
∗marcello.rossetti@mi.infn.itwith𝑄𝑏/𝑒the number of particles per bunch and 𝑓the
rep.rate, it is straightforward that the energy 𝐸0should be
as low as possible.
Thedrawbackofalow-energyinjectioncomesfromspace-
charge (SC) effects which are dumped with a power that
scales with1
(𝛽𝛾)3and a ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 0 |
445c2e3c-0a8c-4f1f-b85f-1a79dae659ae | beam energy and beam compression control.
INJECTOR DESIGN RATIONALE
TheERLinjector/mergerhereproposedandsketchedin
Fig. 1 is based on consolidated technologies. A compari-
sonwithothermainworldwideprojectsshowshowwiththe
scheme here presented is possible to inject at 4.5 MeVwith
abunchchargeof 100 pC,versusthe 8 MeVand... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 0 |
4905621c-a443-45bd-bcc0-139f7a187a9f | operating at 650 MHz. The decision touse asub-harmonic
frequencyof650MHzwasbasedonconsiderationsofbeam
dynamics. A longer rf bucket permits the trapping of longer
cigar-shapedelectronbunches,whichtypicallyexhibitlower
emittance. Moreover, a more linear accelerating field offers
significant benefits for energy spread re... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 0 |
5d837677-77bb-4f07-a192-8d9e95c45cb1 | Figure 1: The ERL injector schema: the DC-gun, the two bunchers, the injector booster and the low energy dogleg.
of achromaticity during beam transport. This phenomenon
issimilartotheeffectsobservedinmagneticcompressors
or arc compressors due to the presence of Coherent Syn-
chrotron Radiation (CSR) emission [7].
Theco... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 1 |
54987e13-dc3e-4195-a8b4-12aed5e38f8f | handling complex problems in which variables are strongly
correlated in a non-linear manner [11].
Inthisstudy,GIOTTOwasusedtodriveAstrainmulti-
objective optimizations.
OPTIMIZATIONS AND SIMULATIONS
The simulations presented in this section track a single
bunchwithachargeof 100 pC. TheSCeffectsarecomputed
alongthewhole... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 1 |
d5fec4f2-811d-44f1-85d7-73c1e649c956 | explained step by step below and visible in Fig. 2:
Gune-bunch generation by a Laser driven DC gun
250kV/m [5]. Laser pulse shaping data is reported
in Table 1.
Gun-solenoid A solenoid for the emittance compensation.
Figure 2: Upper plot: beam emittance and envelope. Lower
plot: beam energy gain, bunch length and energ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 1 |
9ab6ebcb-aa00-42c7-ba7f-e7443d7f7ae0 | Sb-buncher-II The second sub-harmonic buncher works
in a similar way to the previous one.
Second drift Here the beam continues its bunching and
its emittance oscillation reaches a relative minimum;
this is the correct condition to inject the beam into the
boosterexploitingthevelocitybunching[13]technique.
Injector boos... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 1 |
471560da-a3c7-41a2-9186-f4a95fc845a9 | Drift before the dogleg Here the beam has 4.5 MeVof en-
ergy and shows optimal and stable beam parameters
that are reported in Table 2.
The solenoids of the line (in Fig. 2 in pink) are 7 cmlong
capable to generate few hundreds of Gauss.
Table 2: Main Bunch Parameters at the Exit of the Booster
Parameter Value
𝜀𝑛,𝑥,... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 2 |
468a1bc4-0e3c-491b-8f73-e784353010a2 | can be used to overcome these effects, for example, the one
named “zigzag" scheme [14, 15]. The merger line we use is
a classic dogleg configuration: two dipoles ( 𝜃𝑏𝑒𝑛𝑑= 20 deg
and𝜌=0.28 m) and three quadrupoles (L = 0.1 m). Here
we show how the SC effects can be well compensated by
anappropriatebeamlinesettingf... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 2 |
ef7acefa-a65d-4055-bb18-3830a9923cb6 | 𝑄4,𝑄5,𝑄6(𝜂,𝜂′comp.) 1.016, -0.717, 0.964
*CavitiesΦ𝑖𝑛𝑗refers to the crest of the rf wave that is at 0
[deg].
AsitisvisibleinFig. 3,thedispersionisperfectlyclosed
on both planes ( 𝜂=0and𝜂′=0). It is visible a small
Figure 3: Dogleg beam tracking. The upper plot shows
the beam envelopes and the beam emittance. ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 2 |
b3c97445-33c1-4261-b984-e48571eb9842 | stream of the ERL the beam can be further compressed tak-
ingadvantageofahigherbeamenergy. Theenergyspread
increases from 8.9 keVto26.0 keVwhich is still a very low
value. ItisworthtonoteinFig.3howGIOTTOrestoresa
quasi cylindrical beam on the transverse plane at the end of
the dispersive path.
CONCLUSION
This paper pre... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 2 |
535cf0e2-516e-47e9-aea3-e77f2c59e97b | both with an ad hoc 𝜆𝑐𝑒𝑙𝑙for a better control of the beam
phase slippage (versus the accelerating wave) and the VB
itself. FurthertheseestablishedBDconcepts,weexploitthe
breakthroughforceoftheGIOTTO[10]codetocopewith
the complex problem of a space-charge dominated disper-
sivepath,avoidingtheuseofpeculiardispersiv... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 2 |
a4e1b3f1-bbad-4691-9964-c7e28188134b | REFERENCES
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[2]L.SerafiniandJ.B.Rosenzweig,“Envelopeanalysisofin-
tense relativisticquasilaminar beams in rf photoinjectors... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 3 |
90610538-9221-462b-b23c-85180ae7f1f6 | doi:10.18429/JACoW-IPAC2018-THPMF034
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8161bffc-cdde-48e4-9d14-ec537fa23968 | tionoffreeelectronlaserperformancebydispersion-based
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bb04b003-84d2-4048-94e9-614eb802df0a | no. 8, p. 737, 2009. doi:10.1119/1.3129242
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[14]V.N.Litvinenko,R.Hajima,andD.Kayran,“Mergerdesigns
forerls,” Nucl. Instrum. Methods Phys. Res., Sect. A ,vol.557,... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA019.pdf | 3 |
b28c41ac-897f-413f-96e5-06e4a54a1b47 | MAGNETIC DESIGN OF THE COMMUTATIONAL MAGNET
AND QUADRUPOLES FOR PERLE ACCELERATOR
R. Abukeshek∗, University Paris-Saclay, IJCLab, Orsay, France
H. Abualrob, An-Najah National University, Nablus, Palestine
A. Stocchi, L. Perrot, A. Fomin, J. Michaud, University Paris-Saclay, IJCLab, Orsay, France
A. Bogacz, J. Benesch†,... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 0 |
09586d1d-a746-49e5-b6cd-a6f48de6c578 | riesofquadrupolemagnetsisdiscussed. TheB-commagnet
is optimized for a 30𝑜bending angle with harmonic content
of0.036%. The quadrupole magnets generate a field gradi-
ent of34.15T/m. Further studies to suppress saturation at a
maximum gradient of 44.1T/m are undergoing.
INTRODUCTION
EnergyRecoveryLINAC(ERL)[1]providesL... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 0 |
3f1b4d1d-69be-4256-840c-d7dafc1635d1 | Parameter Value Unit
Injection energy 7 MeV
Max. Beam energy 500 MeV
Beam rigidity 1.67 T⋅m
Injection beam current 20 mA
Bunch charge 500 pC
Bunch length 3 mm
Injection Bunch spacing 25 ns
Normalized emittance 6mm⋅mrad
RF frequency 801.58 MHz
Duty factor CW
PERLEiscomposedofthreesections: theLINACsection
at each straig... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 0 |
a3b6ce92-3cf6-4841-8d1f-1659ba082bb3 | accommodate commutational dipole (B-com magnet) [6]
with horizontal magnetic field and a 30𝑜bending angle to
split/combine the beam vertically at three different energies:
171MeV,336MeV,and500MeV. A8.842cmverticalshift
is required for the lowest energy beam. Normal conduct-
ing, Iron-dominated electromagnet technology... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 0 |
df1ab375-e29b-4e71-b559-12827cc864d3 | forquadrupolemagnets. Non-allowedharmonicsarepresent
due tomanufacturing tolerances. The symmetry of the yoke
geometrycanrestrictthepresenceofhigher-orderharmon-
ics. Higher-orderharmonicsdegradethefielddistribution
and must be reduced for stable beam trajectory. Dipole field
errors lead to undesired beam oscillation a... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 0 |
36dd8359-2617-46c5-9dd4-d3090dcda93e | magnetaperture. Dipolemagnetpoleshapefollows 𝑦 = ±ℎ
2.
Quadrupolepoleshapeisahyperboliccontour 𝑥𝑦 = ±𝑟2
2[7].
B-COM MAGNET DESIGN
ThedesignwascarriedoutwithOpera3D,afiniteelement
analysis software [8]. From the beam dynamics study of
PERLElattice,thebeamsizedoesnotexceed 2mmat3𝜎
(see Figure 2). Taking into account... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 1 |
92c7ceab-6e43-468a-8be6-50929b263080 | andredbarsrepresentquadrupolemagnets. Thebeam size
is in mm corresponding to 3𝜎.
Table 2: Coil Design Parameters of PERLE B-com Magnet
Parameter Value
Conductor width 8 mm
Conductor aperture 5 mm
Conductor corner radius 0.5 mm
Ampere-turns NI 11520.2625 A ⋅turn
Number of turns/coil 30
Coil width 42.5 mm
Coil thickness... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 1 |
e92d2fee-be0f-4ab3-b87d-3a4b2af9c1f4 | energetic beam exits the steel at 8.85cm. The harmonic
components of the magnet were calculated on a circle of
1cmradiusalongthetrajectoryoftheparticleswith 0.25cm
intervals. Thesquarerootofthesumoftheharmoniccoeffi-
cients squared is 0.036%on the lowest energy beam. The
orderofmagnitudeofthefieldhomogeneity 10−4meetst... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 1 |
c0d30022-2741-46f4-81a6-998c1772ac5e | of quadrupoles and sextupoles.
(a)
(b)
Figure4: (a)Verticaldistributionofthehorizontalmagnetic
field. (b) Fieldhomogeneityalong the pole width.
Figure5: TrajectoryoftheelectronbeamthroughtheB-com
magnet at three energies: 171 MeV, 336 MeV, and 500 MeV.
Initial position of the beam is (4.4,0,-60) cm. | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 1 |
d0c8a1ac-9b15-4f63-8f7b-b3cbf9621fd4 | Figure 6: Higher harmonics with respect to the dipole com-
ponent𝑏1for electron energy of 171 MeV.
QUADRUPOLE MAGNET DESIGN
Figure7ashowsthemulti-coildesignofthe 15cmlength
quadrupole magnet. The yoke is a cylindrical tube of
250mmouterdiameterwith 35mmthicknessconsidering
the450mmverticalseparationbetweenthearcs. Ape... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 2 |
7cda9928-9d60-4198-ae11-acb3aafcc451 | Conductor aperture 2 mm
Conductor corner radius 0.5 mm
Excitation current 1750.7 A ⋅turn
Number of turns/pole 20
Current 87.535 A
Coil cross-section 20.25 mm2
Current density 2.882 A/mm2
Figure 8 shows the vertical field component 𝐵𝑦as a func-
tion of the horizontal direction 𝑥. The gradient generated by
the three-c... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 2 |
4ae7123d-0dff-408b-8480-a665bec9bbff | (a)
(b)
Figure 7: (a) Three-coil quadrupole design of the 𝑙 =15 cm
quadrupole series of PERLE. (b) One octant of the
quadrupole. Areas with a magneticfield higher than 2T are
not displayed.
Figure 8: Horizontal distribution of the vertical magnetic
field of the quadrupole.
updatedparametersfortheopticselementwillbeco... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 2 |
ddcc0307-a52c-48cd-89bc-bbe48c5b505e | et al., “CBETA Design Report, Cornell-BNL ERL Test Accel-
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H. W. Glock and F. Glöckner, et al., “Status Report of... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 2 |
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[6]Leemann, Christoph W and Douglas, David R and Krafft,
Geoffrey,“Thecontinuouselectronbeamacceleratorfacility:
CEBAF at the Jefferson Laboratory,” Annua... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA023.pdf | 3 |
56005907-0e38-4667-b89c-dc939e2c6eac | FIRST COAXIAL HOM COUPLER PROTOTYPES AND RF
MEASUREMENTS ON A COPPER CAVITY FOR THE PERLE PROJECT
C. Barbagallo∗1, P. Duchesne, W. Kaabi, G. Olivier, G. Olry, S. Roset, F. Zomer1
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Orsay, France
J. Henry, S. A. Overstreet, G.-T. Park, R. A. Rimmer, H. Wan... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA025.pdf | 0 |
9b9377da-7095-43ec-b174-e35470d2be31 | cavityhaverecentlystartedincollaborationwithJLaband
CERN.Thispaperprovidesanoverviewofthedesignofthe
fabricated HOM couplers and the first RF measurements of
thecavity’sHOMsperformedatwarmonan801.58MHz
2-cellcoppercavitytovalidatecouplerdesignperformances.
Measured cavity data is also compared to eigenmode simu-
lation... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA025.pdf | 0 |
cb9974b6-c7c5-4420-b9b7-35072bc73647 | based on the HOM spectrum of the 5-cell PERLE cavity
(as presented in [3]), we demonstrated in our previous work
(ref.[4])thatthesecouplerdesignsfulfillregenerativebeam
breakup (BBU) and fundamental mode (FM) RF-heating
requirements. Consequently, prototypes of each coupler
were fabricated, as illustrated in Fig. 1, to... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA025.pdf | 0 |
727bb3b5-7624-44fb-a441-0e2135dbbc1c | present external quality factor ( 𝑄ext) measurements for FM
andtrappedhigh 𝑅/𝑄HOMs,whicharethemostcritical,
toevaluatewhetherourmeasurementsetupisappropriate
for verifying the simulated eigenmode CST [5] results.
∗carmelo.barbagallo@ijclab.in2p3.fr
(a)
(b)
Figure 1: Mechanical design (a) and 3D-printed plastic and
c... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA025.pdf | 0 |
7d9c04bc-4f0b-4b9e-bd8f-2b39a7f17389 | 3D Printing for HOM Coupler Fabrication
The CERN Polymerlab team employed the Viper si2
SLA©(Stereolithography) rapid prototyping machine to 3D
printHOMcouplersusingbothAccura©25[6]andAccura© | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA025.pdf | 0 |
9595f0db-8318-4017-bea0-fe1a19e5721a | 48HTR(High-Heat-Resistant)[7]epoxy(seeFig.2.). Ac-
cura25(white)hasgreaterflexibilityandlowerstiffnessbut
also exhibits lower tensile strength and deflection temper-
ature at high pressure. Accura 48 HTR (transparent) has
higher strength, stiffness, and thermal stability, making it a
more robust material for 3D printin... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA025.pdf | 1 |
299b1961-e869-4e40-9c08-34db8a8bcbed | copper adhesion during coating, a light corundum-based
sandblasting treatment was applied to the printed parts at
a pressureof 3bars, followed bydegreasing usingan NGL
17-40-type detergent to remove any blasting residue. The
preparedcomponentswerethenimmersedinacarbon-based
bathtoallownegativelychargedcarbonparticlesto... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA025.pdf | 1 |
b666d597-8712-4ee3-b605-d740f28de7c9 | can reach up to 200 μm.
To ensure HOM coupler transmission was not affected by
geometricvariations,wesetaminimumfeasibletoleranceof
±0.5mmfortheentirecouplersurface,exceptfortheregions
influencing the notch frequency, where the tolerance was
established at±0.25 mm. 3D-scanning measurements were
carried-ou to asses the ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA025.pdf | 1 |
724cc6d0-129c-44f8-976d-507edcf73a53 | field coupling. In addition, excess material ranging from
0.815 to 0.968 mm was found on both sides of the small
straight part of the antenna, which can potentially affect the
electriccoupling,includingthenotchfrequencyoftheHook
coupler.
Figure 3: 3D-scanning measurements for the Accura 25
Hook coupler (HookV01).
HOM C... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA025.pdf | 1 |
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