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d5bc088c-2376-4d11-83af-5a3eff15db41 | IonCollider”, Phys. Rev. ST Accel. Beams ,vol.15,p.051004,
2012. doi:10.1103/PhysRevSTAB.15.051004
[10]D. Xu et al., “Study of Harmonic Crab Cavity in EIC Beam-
Beam Simulations”, BNL, NY, USA, BNL-222291-2021-
COPA, 2021.
[11]M. Bassetti and G. A. Erskine, “Closed expression for the
electrical field of a two-dimension... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA040.pdf | 3 |
f580dc22-7c7f-47c2-9bcd-ed8671e310ec | BEAM OPTICS UPDATE FOR EIC HSR-IR2∗
D. Xu†, J. S. Berg, W. Bergan, D. Holmes, H. Lovelace III, C. Liu,
S. Peggs, G. Robert-Demolaize, E. Wang, BNL, Upton, NY, USA
B. R. Gamage, Jefferson Lab, Newport News, VA, USA
Abstract
The Insertion Region 2 (IR2) will accommodate a Pre-
Cooler at injection energy ( 24 GeV) and a S... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 0 |
589c69b5-4a0c-4f3f-874a-b8a81b959d41 | beamtomatchtheelectronbeamsizeattheinteractionpoint
(IP). The technique of electron cooling is utilized to pre-
cool proton bunches at an injection energy of 23.8 GeV[1]
toachieveaflatprotonbeamprofilewithsmallemittance.
Once pre-cooled, the proton bunches are then accelerated
to the collision energy. At the top energy... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 0 |
37d430d8-2fbb-4264-a9d4-e207f2c08a45 | coolingandthepre-coolingsharethesameEnergyRecovery
Linac (ERL). In the case of strong hadron cooling, The pro-
tons and electrons co-propagate in the modulator and kicker
sections. TheCoulombinteractionbetweenprotonsandelec-
trons in the modulator section results in microscopic energy
perturbations on electrons. These ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 0 |
758c48dd-83af-447d-b242-ffd9d5a6bbc9 | 100 GeV and275 GeV.
∗Work supported by Brookhaven Science Associates, LLC under Contract
No. DE-SC0012704 with the U.S. Department of Energy
†dxu@bnl.gov
Figure 1: The strong hadron cooler and the pre-cooler in
HSR-IR2 share the same Energy Recovery Linac (ERL).
Protonsco-propagateswithelectrons inthemodulator and
kick... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 0 |
1aa13971-e121-4f97-bd74-2cdf5eb90af8 | Thesymbols⊕and⊖indicatetwodipolesthatdeflectthe
orbit in opposite directions.
Figure3: Theorbitforold(blue)andnew(orange)layout.
The entrance and exit of HSR-IR2 stay same as before.
InordertoincorporatetheSiberiansnakeintotheHSR-
IR2,thelatticestructurehasbeenalteredfromasymmetrical
to an asymmetrical layout. In the 6... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 0 |
ad735c8a-e671-46bb-9bb5-1a702ad22217 | snake located in IR2 must be positioned at an exact rotation
angle of 180◦away from the snake in IR8. However, the
snake’slocationdiffersbetweenthedesignsofcollidingIR8
and non-colliding IR8. More details about colliding IR8
andnon-collidingIR8canbefoundin[6]. Asaresult,the
regionbetweenQ9andQ8onthemodulatorside,aswell... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 1 |
014f2ad7-5caa-4d71-93ce-ea15bcca7953 | requisite for pre-cooling. To better match the optics for
horizontal cooling, a pair of dipoles has been inserted be-
tween the modulator and kicker. In order to maintain the
total bending angle, one dipole deflects the orbit inwards,
while the other deflects it outwards.
STRONG HADRON COOLING UPDATE
In accordance with... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 1 |
857a5521-1734-4e64-a697-d4cd979769e7 | thephaseadvancefromthemodulatorcentertothekicker
center.
Equation(1)isapplicableforbothhorizontalandvertical
planes. Inthelongitudinalplane,thecoolingcoefficientis
represented by
𝑆𝑧=𝑅ℎ
56−𝑆𝑥−𝑆𝑦, (2)where𝑅ℎ
56is the strength of the hadron chicane between
the modulator and kicker section. The cooling rates are
ap... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 1 |
23b0cc1c-9be2-45b4-83f2-0febde1218b7 | Δ𝑍𝑧=(𝑅ℎ
56−𝑆𝑥−𝑆𝑦)𝜎𝛿. (5)
Ideally,allofthesedelays, Δ𝑍𝑥,Δ𝑍𝑦,Δ𝑍𝑧shouldbesmall
incomparisontoaquarterwakewavelength. Inthematching
process,if𝑆𝑥and𝑆𝑦aresettoaspecificvalue,thelongitudi-
naldelaywillautomaticallysatisfytheconstraint,andhence
Δ𝑍𝑧is not considered in the matching. The requirements
for𝑆�... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 1 |
6a5b4c4e-5f99-4bfd-bd50-ff301a53c883 | ERL.Inthecourseofthisalignment,themeansizeofthe
beams is employed as a criterion, which can be expressed
mathematically as follows:
<𝜎 >=1
𝐿∫𝐿
0𝜎d𝑠=1
𝐿∫𝐿
0√︃
𝛽𝜖+𝐷2𝜎2
𝛿d𝑠,(6)
where𝐿is the length of the overlap region in the modulator
or kicker sections.
Table2presentstheconstraintsfortheaveragesizeofthe
pr... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 1 |
4920ff00-c913-42b8-91d4-3cf8a6c48313 | Table 2: Constraints for Average Beam Sizes at 100 GeV
and275 GeV
parameter relation unit 275 GeV 100 GeV
<𝜎𝑥,𝑚> ⪅ mm 0.9 1.0
<𝜎𝑦,𝑚> ⪅ mm 0.4 0.3
<𝜎𝑥,𝑘> ⪅ mm 0.6 1.0
<𝜎𝑦,𝑘> ⪅ mm 0.2 0.3
There are 19quadrupoles in the asymmetric layout in
Fig. 2. Their strengths are varied to match the cooling re-
quirements... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 2 |
7125c328-e73c-4ef6-b5bc-cb6e2c1d52ef | To obtain the global minimum, the BlackBoxOptim pack-
age [9] within the Julia programming language is employed.
The resulting matches are illustrated in Fig. 5. All listed
constraintshavebeensatisfactorilymet,exceptforvertical
cooling, which requires vertical dispersion.
Figure 5: Beam optics matching results, top: 27... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 2 |
f055a094-2918-4a47-8081-cab5092ba300 | 𝑃𝑚
. (9)
BysubstitutingEq.(9)intoEq.(8),thecoolingcoefficient
𝑆becomes zero, indicating that no cooling occurs when no
dispersion is generated between the modulator and kicker
sections.
Toobtainanon-zerovaluefor 𝑆𝑦,twoconditionsmustbe
met. Firstly,anon-zeroverticaldispersionmustbepresentin
boththemodulatorandkick... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 2 |
a32e2eb3-9e57-43f9-a1b3-6b7466b40c2e | HSR-IR2intheEIC.ThepurposeofIR2istoaccommodate
apre-cooleratinjectionenergyandaStrongHadronCooling
facility at top energy. The original symmetrical layout of
IR2 has been transformed into an asymmetrical one to align
withtheIR8. Thelatticedesignhasbeenupdated tomeet
the requirements of the strong hadron cooling. The me... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 2 |
74a65fa6-2064-4ec6-8b42-b743ae894ea5 | p. 114402, 2018.
doi:10.1103/PhysRevAccelBeams.21.114402
[4]E.Wang et al.,“ElectronIonColliderStrongHadronCooling
InjectorandERL”,in Proc. LINAC’22 ,Liverpool,UK,Aug.-
Sep. 2022, pp. 7–12.
doi:10.18429/JACoW-LINAC2022-MO2AA04
[5]S. Peggs et al., “Optics for Strong Hadron Cooling in EIC
HSR-IR2”, in Proc. IPAC’22 , Bang... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 2 |
8f370d7c-aafc-48b8-9bdb-da29235856e1 | [6]B.R. Gamage et al.,“Second interactionregiondesign con-
cept for the Electron Ion Collider”, presented at IPAC’23,
Venice, Italy, 2023, paper MOPA022, this conference.
[7]P. Baxevanis and G. Stupakov, “Transverse dynamics con-
siderations for microbunched electron cooling”, Phys. Rev.
Accel. Beams , vol. 22, p. 0810... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA041.pdf | 3 |
0956bcb8-b66b-4269-928c-1f71d7b425ff | SIMULATION TEST OF VARIOUS CRAB DISPERSION CLOSURE
BUMPS FOR THE HADRON STORAGE RING
OF THE ELECTRON-ION COLLIDER*
Y. Luo†, J. S. Berg, M. Blaskiewicz, A. Drees, X. Gu, H. Lovelace III,
C. Montag, D. Marx, S. Peggs, V. Ptitsyn, F. Willeke, H. Witte, Q. Wu,
B. Xiao, D. Xu, Brookhaven National Laboratory, Upton, NY, USA
... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 0 |
2480b480-18e6-4916-a91d-8694055c6878 | energy range of 20-140 GeV. To compensate the geometric
luminosity loss due to a large crossing angle 25 mrad in
the EIC, crab cavities are to be installed on both sides of
theinteractionpoint(IP)inbothringstoconstructalocal
closedcrabbingbump. However,forthecurrentdesignlat-
ticeoftheHadronStorageRing,thecrabdispersio... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 0 |
5f9692f0-c84c-433e-a654-bdbfdaddd872 | Instead,weobservedthattheIRmagneticfielderrorsplay
anmoreimportantroletothedynamicaperturethanthecrab
dispersion bump closure.
INTRODUCTION
TheElectron-IonCollider(EIC)presentlyunderconstruc-
tionatBrookhavenNationalLaboratorywillcollidepolar-
ized high energy electron beams with hadron beams with
luminosities up to 1×... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 0 |
2ec2d5e5-d98c-452d-8f38-f5197703d5c9 | region (IR). The total phase advance between two side crab
cavities is therefore 175 degrees, 5 degrees short of 180
*WorksupportedbyBrookhavenScienceAssociates,LLCunderContract
No. DE-SC0012704 with the U.S. Department of Energy.
†yluo@bnl.govdegreestoclosethecrabdispersionbumplocally. Therefore,
there is crab dispers... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 0 |
faed7b80-3efc-4101-88c6-987915e4b898 | also will test various closed bump schemes in the HSR. By
insertingartificialphasetrombones,weconstructedanartifi-
cial local 3-bump and 4-bump of horizontal crab dispersion
in the IR6, and artificial 3-bump closed between IR6 and
IR8. The purpose of this study is to determine the negative
impactsfromtheunclosedcrabdis... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 0 |
d7451819-5d3a-4beb-9783-9c91b2337e68 | optics parameters used for this study.
Table1: Beam-beamRelatedBeam andOpticsParameters
forCollisionBetween10GeVElectronsand275GeVPro-
tons
quantity unit proton electron
Beam energy GeV 275 10
Bunch intensity 10110.668 1.72
(𝛽*
𝑥, 𝛽*
𝑦)at IP cm (80, 7.2) (55, 5.6)
RMS Beam sizes at IP µm (95, 8.5)
Bunch length cm 6... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 0 |
90a1d2f3-5b81-4bfc-941f-eeaa9cac0b35 | LEAKAGE OF CRAB DISPERSION
TheHSRwillhavefour197MHzandtwo394MHzcrab
cavities on each side of IP6 and they will tilt the proton
bunch in the 𝑥−𝑧plane by 12.5 mrad to restore head-on
collisions at the IP. Ideally, we need 90 degree horizontal
phaseadvancebetweenIP6andthecrabcavitiesoneither
side. Theminimumrequirementi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 1 |
890fc2fb-a281-4061-88c8-75270c385f9d | the IR6, and the maximum crab dispersion amplitude in the
arcs reaches 5 mrad.
Figure1: HorizontalcrabdispersionintheHSRringwith
the unclosed bump in the IR6.
CRAB DISPERSION BUMP SETUP
To assess the impacts of the unclosed crab dispersion
bump in the IR6 in the HSR, we also constructed a few
closed bumps for compariso... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 1 |
9c71468f-a2df-465a-a25e-6cb0b7e6c268 | cavities outside the existing crab cavities.
For the EIC, there are onging studies for a futrure second
interactionregionatIP8. Therefore,oneoptionistobuild
a closed 3-bump of crab dispersion between IR6 and IR8.
WewillinstallathirdcrabcavityinIR8. Wealsosimulatea
longer 3-bumpbetween IR6and IR10for comparison with
the... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 1 |
8dbf7417-3250-49c5-b1e8-582fe71c91ac | are launched in the first quadrant of phase space ( 𝑥/𝜎 𝑥,
𝑦/𝜎𝑦) in 5 equidistant phase angles and tracked up to 1
million turns. We search the minimum dynamic aperture in
eachdirectionofthosephaseangleswithastepsizeof0.1 𝜎.
In the dynamic aperture calculation, we included random
nonlinear magnetic field errors ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 1 |
45a7218c-0880-4d06-9917-802f42e7499e | Figure 3: Dynamic aperture with head-on collision and
crossing collision with the unclosed crab dispersion bump.
Figure 4 shows the dynamic apertures as function of half
crossing angle with the unclosed crab dispersion bump. For
eachhalfcrossingangle,were-matchedthevoltagesofcrab
cavities to restore head-on collision a... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 1 |
edc95079-e6c1-439b-8f83-e65216c3d229 | Figure 4: Dynamic aperture as function of crossing angle.
Table 2: Dynamic Aperture for Various Crab Dispersion
Closure Bumps
Case Minimum Maximum Average RMS
Name DA DA DA in DAs
head-on 8.3 13.0 10.5 1.0
unclosed 5.1 10.5 7.1 1.6
𝜋bump in IR6 4.6 11.1 7.8 1.5
3-bump in IR6 5.7 10.3 7.6 1.4
4-bump in IR6 4.9 10.7 7.3... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 2 |
aa08f13a-16b7-4d27-9996-f9d6f1f8cf1a | Unclosed vs Closed bumps
Table2liststhedynamicaperturecalculationresultsfor
the unclosed and closed crab dispersion bumps. There is
a very small difference between the unclosed and closed
bumps. The average dynamic apertureamong 40 seeds are
all above or very close to 7 𝜎. However, the minimum dy-
namicapertureofsomec... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 2 |
62772056-71ee-489d-8c11-718e5b68a373 | Figure 7 shows the dynamic aperture as function of seeds
ofrandomIRmagneticfielderrors. Someseedsalwayshave
larger dynamic apertures than other seeds, no matter with
whatkindsofcrabdispersionbumps. Thismeansthatthe
IR magnetic field errors play a more important role to the
dynamic aperture than the crab disperison bump... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 2 |
a41bf360-02f4-4938-a39e-e7a953b23428 | stead, we observed that the IR magnetic field errors play an
moreimportantroletothedynamicaperturethanthecrab
dispersionbumpclosure. Wewillre-visitthistopicwitha
better knowledge of IR magnetic field errors. | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 2 |
cddf72e3-c401-486b-a1ec-90fbcb41e9bd | REFERENCES
[1]J. Beebe-Wang et al., “Electron-Ion Collider: Conceptual De-
sign Report”, Brookhaven National Laboratory, Jefferson Lab,
2021. www.bnl.gov/EC/files/EIC_CDR_Final.pdf
[2]C.Montag et al.,“DesignStatusUpdateoftheElectron-Ion
Collider”, presented at IPAC’23, Venice, Italy, May 2023, pa-
per MOPA049, this con... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA045.pdf | 3 |
015e9914-7b3e-455a-a942-cb928dc15408 | REVISIT THE EFFECTS OF 10 HZ ORBIT OSCILLATION IN THE
RELATIVISTIC HEAVY ION COLLIDER*
Y. Luo†, M. Blaskiewicz, W. Fischer, D. Marx, C. Montag, B. Podobedov, D. Xu
Brookhaven National Laboratory, Upton, NY, USA
Abstract
10 Hz horizontal orbit oscillation due to helium flow was
observedintheroutineoperationoftheRelativi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 0 |
19c18f9d-27de-4b17-8660-4eabdf4e76e8 | Collider (EIC).
INTRODUCTION
Horizontal beam orbit oscillations at frequencies around
10 Hz had been observed in the Relativistic Heavy Ion Col-
lider(RHIC).Theoscillationamplitudeiscomparabletothe
RMSbeamsizeattheinteractionpoint(IP).The10Hzorbit
jitter made orbit correction difficult, especially when the be-
tatron t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 0 |
31a9e48c-31a9-47de-bbfa-129a52100208 | helium circulator. Thesemechanical triplet vibrations cause
sizeable horizontal orbit oscillation around the frequency
10 Hz in the ring [1]. For simplicity, we call this kind of
orbit oscillation 10 Hz orbit jitter.
Tocorrectthe10Hzhorizontalorbitoscillation,wedevel-
opedanorbitcorrectionfeedbacksystemwith12horizontal... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 0 |
1ea77a55-25f6-49e2-8d9f-72436da9081f | *WorksupportedbyBrookhavenScienceAssociates,LLCunderContract
No. DE-SC0012704 with the U.S. Department of Energy.
†yluo@bnl.govbeam-beam simulation was performed to determine the tol-
erance of beam orbit jitter at the IP and the current ripple
specifications for the ESR magnet power supplies [5]. In
this article, we r... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 0 |
410e4ae4-5470-4365-b5f1-15f777b81a26 | withoutandwith10Hzfeedback. Thedatawithoutfeedback
weretakenfromFill32805,andthedatawithfeedbackon
were taken from Fill 32811. The peak amplitude is 650 𝜇m
without feedback on, and 75 𝜇m with the feedback.
During the physics operation, the 10 Hz orbit feedback
wasalwayskepton. However,wenoticedthattherewasa
veryshort... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 0 |
3a5be1d0-14e2-4d64-9ee4-f042d094ef9b | 2022. Orbitdataweretakenfromdifferentfillsw/o10Hz
orbit feedback tuned in.
Besides the peak amplitude of orbit jitter, we are also
interested in its frequency spectrum. Figure 3 shows the
spectrum of BPM bi5-bh3 readings from Fill 32805, where
the 10 Hz orbit feedback was not tuned in. The 10 Hz is the
dominant frequen... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 0 |
20288aaa-0156-4a1f-be2c-8ce869a7091d | Figure 2: Orbit jitter measured in Fill 33273 during the
physics operation. Here 10 Hz orbit feedback was intention-
ally turned off before re-bucketing.
peakamplitude20timessmallerthanthe10Hzpeak. 60Hz
is the frequency of AC electricity in the United States.
Figure 3: Spectrum oforbit jitterwithout 10Hz orbitfeed-
bac... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 1 |
58533926-4a64-4948-a3b1-e4127e83983f | arelessthan1Hz. Tobetterquantifytheiramplitudes,we
integrated all the spectrum amplitudes in the neighboring
frequencies. Based on the optics model, we are able to
scaletheamplitudesoforbitjittersfromBPMbi5-bh3tothe
IP.Theratioofthesquarerootof 𝛽-functionsatthosetwoTable 1: Beam and Optics Parameters for the Simulatio... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 1 |
81550b75-3c17-4206-9f2d-a040d85678c4 | With the 10 Hz feedback on, its amplitude drops to 1.3 𝜇m.
BEAM-BEAM SIMULATION
In thefollowing, we presentthe simulation results based
onweak-strongbeam-beamsimulations[6]. Inthismodel,
one proton bunch in one ring was represented by 0.5 mil-
lionmacro-particles, andthe otherbunch inanotherring is
representedbyarigid... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 1 |
a51ce82e-0aee-4756-8ede-7fe30b9820a2 | isthetotalbeam-beamparameterwith2IPsinRHIC.The
orbitjittersareintroducedonlyinthehorizontalplaneatthe
IP.
Figure5showsoneexampleofRMSbeamsizeevolution
in106turns. Hereweintroducedasinglesinusoidalwaveof
obitjittteratIP6withitsamplitude60 𝜇m. Welinearlyfit
therecordedbeamsizetogettherelativebeamsizeincrease
perturn,fro... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 1 |
04574bd7-d410-4628-83ac-5aa1c1e8b64d | Table 2: Simulated Growth Rates with Single Frequency
Orbit Jitter at IP
Horizontal Beam Vertical Beam
Case Size Growth Rate Size Growth Rate
Amplitude ( %/hour ) ( %/hour )
no jitter:
0𝜇m 1.9 0.02
10 Hz:
60𝜇m 17.5 1.5
30𝜇m 14.0 0.6
10𝜇m 4.2 0.008
5𝜇m 2.9 -0.002
1𝜇m 3.1 -0.06
60 Hz:
60𝜇m 10.8 0.2
30𝜇m 5.8 0.1
1... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 2 |
92d33582-8a28-4cf7-89ee-b5ae451b9d6c | less than 5 𝜇m beam-beam offset for both 10 Hz and 60 Hz
oscillations, thehorizontalbeamsizegrowthrateisabout
3%/hour. As we mentioned earlier, with the 10 Hz orbit
feedback on in the RHIC, the peak amplitudes of 10 Hz and
60 Hz oscillations are about 1 𝜇m at IP.
In the following, we introduce a bandwidth to the orbi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 2 |
dab1fd7d-6358-4ace-88dd-175e1100cf85 | haveabandwidthof ±0.5Hz. WesimulatedtheRMSvalues
of the orbit jitters 1 𝜇m to 3 𝜇m for each frequency band.Table 4: Simulated Growth Rates with Combined Orbit
Jitter with 10 Hz and 60 Hz
RMS of Horizontal Beam Vertical Beam
Orbit Jitter Size Growth Rate Size Growth Rate
( %/hour ) ( %/hour )
1𝜇m 2.9 0.0003
2𝜇m 2.6 ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 2 |
df37b2b9-06a7-443f-8989-f604c2dd934d | which we believe is not only from the numerical noises.
To determine the uncertainty in the beam size growth
ratecalculationinaboveweak-strongsimulations,wedoa
convergencestudywithvariednumberofmacro-particles.
Here we use 10 Hz ±0.5Hz frequency bandwidth and set
the RMS of orbit variation to be 1 𝜇m. The number of
ma... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 2 |
dcad593c-6bcb-4660-93bb-6185755aa75b | frequencies around 10 Hz. With the 10 Hz orbit feedback
on, the peak amplitude of all frequencies was reduced by a
factorof10andthepeakamplitudesofresidual10Hzand
60 Hz orbit oscillations are about 1 𝜇m. Weak-strong beam-
beamsimulationwascarriedouttoevaluatetheirimpacts
on the beam size growth with collision. Our sim... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 2 |
b699621d-5fa6-449f-8bfc-01bb2155ca9d | REFERENCES
[1]C.Montag et al.,“Observationofheliumflowinducedbeam
orbitoscillationsatRHIC”, Nucl. Instrum. Methods Phys. Res.,
Sect. A, vol. 564, pp.26-31, 2006. doi:10.1016/j.nima.
2006.03.030
[2]R. J. Michnoff et al., “RHIC 10 Hz Global Orbit Feedback
System”, in Proc. PAC’11 , New York, NY, USA, Mar.-Apr.
2011, pape... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 3 |
0f87804f-4b2e-4ef0-83a8-e8053bcd9bbd | [6]Y.Luo,“SimTrack: Acompactc++codeforparticleorbitand
spin tracking in accelerators”, Nucl. Instrum. Methods Phys.
Res., Sect. A , vol. 801, pp. 95-103, 2015. doi:10.1016/j.
nima.2015.08.014 | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA046.pdf | 3 |
76a3b6e4-b827-49ed-8fba-59f55c3ccc29 | OPTIMIZING THE DESIGN TUNES OF
THE ELECTRON STORAGE RING OF THE ELECTRON-ION COLLIDER*
Y. Luo†, J. S. Berg, M. Blaskiewicz, C. Montag, D. Marx, S. Peggs, V. Ptitsyn,
S. Tepikian, F. Willeke, D. Xu, Brookhaven National Laboratory, Upton, NY, USA
Eliana Gianfelice-Wendt, Fermi National Accelerator Laboratory, Batavia, IL... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 0 |
3d736ad6-8eaa-4ae0-8e29-6d9f08597f69 | resulted in an optimum working point (0.08, 0.06) for the
Electron Storage Ring (ESR) of the EIC. During the ESR
polarization simulation study, this working point was found
to beless than optimalfor theelectron polarization. In this
article,wepresentrecentbeam-beamsimulationresultsin
a wide range tune scan to search fo... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 0 |
dd16d177-e372-46ad-ad2d-13c88b9d6842 | largecrossingangle25mradwithcrabcavitiesinbothrings,
and a novel strong hadron cooling in the Hadron Storage
Ring (HSR) to counteract the intra-beam scattering (IBS) at
store.
FortheEIC,highpolarizationisrequiredfortheelectron,
proton, and light ion beams. Near half-integer tunes have
been used for most previous and ex... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 0 |
53e06df7-8550-404f-bec3-8d3de5da8d13 | large beam-beam parameters for both electron and proton
beamsbasedonthesuccessfulexperiencesfromKEK-Band
RHIC.However,suchacombinationoflargebeam-beampa-
*WorksupportedbyBrookhavenScienceAssociates,LLCunderContract
No. DE-SC0012704 with the U.S. Department of Energy.
†yluo@bnl.govrameters for both electron and proton b... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 0 |
6415360e-561b-4fa0-af0a-d95cb0ad7830 | ESR,itisdifficulttocorrectandcontrolverticalorbitand
the global betatron coupling. For example, to maintain a
relativelyhighelectronpolarization,thebetatroncoupling
in the ESR has to be tightly controlled. The global coupling
coefficientshouldbelessthan0.0002. Inthisarticle,wewill
present our recent new ESR tune scan t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 0 |
a4b6df64-a907-4d45-91cf-996605a2bd63 | 0.1 for the electron beam and 0.015 for the proton beam,
and the peak luminosity reaches its maximum design value
1.0×1034cm−2s−1in the EIC.
In the weak-strong tune scan, we assume that the pro-
tonbunchisrigidandtheelectronbunchisrepresentedby
50,000 macro-particles. Both the horizontal and vertical
electrontunesaresc... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 0 |
6b2cb923-b7b5-4d2b-acff-4f65b549a611 | zontaltuneisbelow0.10,especiallywithahighervertical
tune than the horizontal tune in the upper-left corner of the
shown tune space.
In the strong-strong electron tune scan, both bunches are
represented by 500,000macro-particles andare trackedfor | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 0 |
a738d578-ae6e-4084-b719-7de4692af723 | Figure 1: Luminosity averaged over the last 1000 turns of a
weak-strongsimulationasfunctionofelectrontunes. Values
are in units of 1034cm−2sec−1.
50,000turns. Theprotontunesarefixedat(0.228,0.210).
Boththe horizontal andvertical tunesof theelectron beam
are scanned from 0.02 through 0.20 with a step size of 0.02.
Figur... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 1 |
9cd2c53b-f8fa-4a53-8987-61ffccf31afd | instability happens when the electron horizontal tune is be-
tween 0.1 and 0.14. This instability had been studied in
details and it can be explained by the sum coupling reso-
nancebetweentheelectronbeammodeandtheprotonbeam
mode [4].
For the EIC, besides the maximum design luminosity, we
also pay attention to the long-... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 1 |
ca8e9138-6072-40a8-9ef1-b148c8140716 | Table1: Beam-beamRelatedBeam andOpticsParameters
for the New ESR Tune Scan
quantity unit proton electron
Beam energy GeV 275 10
Bunch intensity 10110.668 1.72
(𝛽*
𝑥, 𝛽*
𝑦)at IP cm (80, 7.2) (55, 5.6)
Beam sizes at IP µm (95, 8.5)
Bunch length cm 6 0.7
Energy spread 10−46.8 5.8
Transverse tunes (0.228,0.210) to be s... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 1 |
f4b99ad6-f6fc-4e15-8f54-756df2f8408c | instability. A better option is to increase the vertical design
tune. Ahigherverticaltunewillbenefittheglobalvertical
orbit correction and a large tune split will benefit the global
betatron coupling compensation, too. In the new tune scan,
wescanthehorizontaltunefrom0.06to0.12andthevertical
tune from 0.1 to 0.2 with a... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 1 |
8f7b603a-2b47-438a-8efe-9e786eceaa39 | higher than 0.1, the proton’s horizontal beam size growth
rate quickly increases. On the other hand, when the ESR
horizontal tune is less than 0.06, the proton’s emittance
growth rates increase too due to the pinch effect for the | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 1 |
9ba40a95-a136-4237-bdf0-14f4962bd37d | electronbeam. Fortheelectron’sverticaltune,weneedto
keep it away from the fifth resonance line at 0.2.
BasedonthenewESRtunescan,werecommendanew
ESR design working point (0.08, 0.14) for further dynamic
apertureandelectronpolarizationsimulationstudies. Note
thatthereisstillsomesafetunespacearound(0.08,0.14).
For example... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 2 |
3e2f406e-f216-4c81-9df1-a0d31546959b | To adjust the electron bunch’s beam sizes at IP, we normally
adjust its 𝛽*s at IP and/or the design electron emittances.
Here we only adjusted the electron beam’s 𝛽*s. Figures 5
- 7 show the evolution of luminosity, horizontal, and ver-
tical beam sizes after re-matching the electron and proton
transverse beam sizes ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 2 |
a98b39d3-8a5c-4028-a2f2-b9afe2c7d24d | ESR design tunes (0.08, 0.14).
Figure 7: Evolution of vertical beam sizes with the new
ESR design tunes (0.08, 0.14).
Table2: ESRDesignParameterswiththeNewESRDesign
Tunes (0.08,0.14)
collision (275GeV, 10GeV) (275GeV, 18GeV )
lattice tunes (0.08, 0.14)
tunes with BB (0.146,0.226) (0.158. 0.225)
𝛽*
𝑥,𝑦(cm) (55, 6.5) ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 2 |
4e33857b-0e03-4c47-a9b2-10e4cf70752b | recommend a new design working point (0.08, 0.14) for the
ESR. We re-matched the beam sizes of electron and proton
beam sizes at IP and also tested the new working point with
other collision mode. Studies are ongoing to evaluate the
effectofthenewworkingpointonelectronpolarizationand
dynamic aperture. | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 2 |
92224e2c-ea68-48d8-8f6f-2357c45e817b | REFERENCES
[1]J. Beebe-Wang et al., “Electron-Ion Collider: Conceptual De-
sign Report”, Brookhaven National Laboratory, Jefferson Lab,
2021. www.bnl.gov/EC/files/EIC_CDR_Final.pdf
[2]C.Montag et al.,“DesignStatusUpdateoftheElectron-Ion
Collider”, presented at IPAC’23, Venice, Italy, May 2023, pa-
per MOPA049, this con... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA047.pdf | 3 |
65303b7c-c795-4d68-9457-cb40d6a2a9af | DYNAMIC APERTURE STUDIES FOR THE
EIC ELECTRON STORAGE RING*
Y . Nosochkov†, Y . Cai, Stanford Linear Accele rator Center, Menlo Park, CA 94025, USA
J. S. Berg, J. Kewisch, Y . Li, D. Marx, C. Montag, S. Peggs, S. Tepikian, H. Witte,
Brookhaven National Laboratory, Upton, NY 11973, USA
G. H. Hoffstaetter, J. Unger... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 0 |
bf8e0644-9b7d-46ad-bdbd-d3148f465984 | ring lattices have been continually optimized to improve the geometric and optics conditions. This paper presents
results of the DA studies for the recent lattices of the Elec-
tron Storage Ring at different energies, including non-lin-ear chromaticity correction, eff ects of errors, magnet field
quality, and orbit c... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 0 |
e38005e5-c3ef-4c77-b85b-de9c5a1f8fec | sufficient beam lifetime requires that dynamic aperture (DA) in both transverse and momentum dimensions
reaches the size of 10 σ of beam distribution. This is a chal-
lenge because the IR final focus quadrupoles, where beta
functions are very high, generate huge linear and non-lin-
ear chromaticity and cause stro ng ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 0 |
d997b02e-9839-4ac0-9d1b-8962df55a837 | order to counterbalance the emittance growth with en-
ergy.
2. The large rms energy spread of σ
p ≈ 0.1%. The 10
GeV and 6 GeV configurations use the weaker 60° arc
optics, where the rms energy spread is about 0.06%.
The two-IP lattices have more high-beta IR quadrupoles,
thus creating the strongest chromatic a... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 0 |
42e26726-b411-453e-a893-4fd52ba52966 | CHROMATICITY
The chromaticity correction scheme for the most chal-
lenging 18 GeV lattice with two IPs is described in detail
in [3, 4]. It consists of mu lti-family chromatic sextupoles,
located in the arcs, and harmonic sextupoles in straight sec-
tions. The scheme provides efficient correction of the non-
linear... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 0 |
1ac1eab2-2289-4d7d-a767-4169ee63f9ae | used in the 60° arcs of the lower energy lattices; however,
their arrangement is different. As a result, different sextu-
pole families must be used in the 90° and 60° lattices, even
though both corrections are based on the same principles.
Since both configurations must use the same physical mag-nets, the sextupol... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 0 |
f0c9aa86-990a-44c0-9757-cdd3ff65a26d | For these studies, the betatron tune is ν
x = 43.12, νy = 38.1,
and the beta functions at the IP6, IP8 are βx* = 45 cm, βy*
= 5.6 cm [6].
The IR high-beta final focu s quadrupoles create signifi-
cant non-linear chromaticity in the form of chromatic beta beating and high order tune shift, which severely limit the
... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 0 |
a1831cda-cdc2-4210-afed-d6c0e9d6f9de | leaved -I sextupole pairs [7]. Therefore, the IR chromatic-
ity correction has to be carried out by sextupoles in the
arcs, called a semi-local correction.
Figure 1: ESR beta functions at 10 GeV with two IRs.
Schematic of the semi-local sextupole scheme on one
side of the IP is shown in Fig. 2. Here, the six in... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 1 |
d47a42f2-f107-4834-a7ad-231f52ab6065 | Fig. 2 by “phase trombone”. The chromatic beta beating is
traditionally described by the Montague functions [8] or by the W-functions. The linear chromaticity in this region is
also optimized for the best non-linear correction.
In this scheme, ideally, the IP W-functions are matched
to zero, and the large W-funct... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 1 |
72bbb315-85ea-4333-9186-b143a04573f5 | scheme on one side of IP, where the columns are quadru-
poles and the hexagons are six-family sextupoles.
The optimal correction of the 10 GeV lattice with a sin-
gle IR6 required an extension of the semi-local scheme to
two arcs per each side of the IR6. The resulting cancella-tion of the IR large W-functions in the... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 1 |
4a6189da-ac7a-4641-a02e-411b86e52f76 | there is only one arc-7 between the IRs. Therefore, sextu-
poles in this arc must compensate both IRs. In this case, the semi-local scheme uses 18 sextupole families in arcs 5, 7,
and 9. LEGO optimization determined that another six
chromatic sextupole families are necessary in the remain-ing three arcs for both line... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 1 |
c95af05d-b37b-4984-a134-7637a98172ae | effects are included; and the rms beam size ( σ) is deter-
mined conservatively for a fully coupled emittance of
ε
x = 22 nm and εy = εx / 2.
Figure 3: W-functions in the 10 GeV lattice with the low-
beta IR6, starting from IP6.
Figure 4: Tune vs δ, and DA without errors at δ = 0 to 0.7%
in the 10 GeV lat... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 1 |
22e8fad1-09e2-4aa0-85bc-e848f751c804 | errors make distortions of beam orbit, dispersion, beta
functions, x-y coupling, chromaticity, betatron tune, and
excite non-linear resonances. The strongest effects come
from errors in the high-beta magnets near the IP.
To avoid unstable optics and minimize the DA reduction,
the error effects are corrected usin... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 1 |
fd93f94f-8cb9-4e78-b9e8-9039d16a82f6 | in LEGO. The betatron tune and linear chromaticity are
maintained at their design values using two-family arc
quadrupoles and sextupoles. The orbit is minimized with
dipole correctors and BPMs, wh ere the vertical correctors
are also used to minimize the vertical dispersion. The trans-
verse coupling is corrected ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 2 |
745e8693-a9f5-42e6-bed7-c70968c09166 | for 10 seeds of random errors. Synchrotron oscillations and
effects of non-linear fringe field in quadrupoles and dipoles [11] are included. The DA size is defined as the minimum
DA among the 10 seeds. Simulations without radiation ef-
fects yield a pessimistic DA estimate, while the radiation damping reduces the ele... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 2 |
29ad0e24-4eb3-4a1e-8cd5-7c7cce52e0ab | quadrupoles and dipoles near IP. Typical residual rms dis-
tortions after correction are: 0.3-0.4 mm of orbit, ~1 m of
Δβ, ~10 cm of horizontal and ~3 cm vertical dispersion.
Various options for the magnet non-linear field have
been examined. Measured mu ltipoles of PEP-II [12],
HERA [13], and APS [14-16] magnets h... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 2 |
2219db85-820d-4c53-ba2e-eca4f94508be | plied to all magnets except the high-beta IR magnets. Mul-tipole tolerances in the high-beta quadrupoles and dipoles
near IP are determined separate ly due to their strong impact
on the DA.
Dynamic aperture with errors for one-IR lattices at
10 GeV and 18 GeV are shown in Fig. 6. The multipole
field in these case... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 2 |
57eb5334-218b-4167-9d02-dc966ef08534 | for one-IR lattices at 10 GeV (left) and 18 GeV (right),
where multipoles from the HE RA quadrupoles are used.
Dynamic aperture for the more challenging two-IR lat-
tice at 18 GeV is shown in Fig. 7 for the multipole options based on 1) HERA quadrupoles and ESR sextupoles, and
2) APS quadrupoles and sextupoles, whe... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 2 |
cafe3858-029e-473f-831a-71f41d207d3f | Assuming a reuse of the APS dual-plane correctors,
which quantity is limited, we examined the scheme where
these correctors and dual-plane BPMs are included only at
defocusing quadrupoles, except in the ±100 m area around IP, where they are at all quad rupoles. This was compared
to more traditional schemes with a ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 2 |
aef9e1d8-af5d-4752-9d03-9686ddc40374 | the DA due to the larger emi ttance should be considered
when deciding on the op timal correction scheme.
This study demonstrates that the required 10 σ DA in
both transverse and momentum dimensions has been achieved with the described chromaticity correction scheme and a careful correction of errors, including the ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 2 |
54ef68a7-e7c9-4cc1-b83c-5c86ff0b0e06 | REFERENCES
[1] J. Beebe-Wang et al., “Electron-ion collider: conceptual de-
sign report", Brookhaven National Laboratory, Thomas Jef-
ferson National Accelerator Facility, 2021.
www.bnl.gov/EC/files/EIC_CDR_Final.pdf
[2] C. Montag et al ., “Design status of the electron-ion col-
lider", presented at IPAC’23, Venic... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 3 |
3347d8f9-0663-4115-8879-e5d477657841 | [5] K. L. Brown and R. V. Serv ranckx, “Optics modules for cir-
cular accelerator design”, SLAC-PUB-3957, May 1986.
[6] Y. Luo et al., “Optimizing the design tunes of the electron
storage ring of the electron-ion collider,” presented at
IPAC’23, Venice, Italy, Ma y 2023, paper MOPA047, this
conference.
[7] M. Dona... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 3 |
b3118c67-898c-484e-8b84-af21dc911f8b | accelerators", Nucl. Instrum. Methods , vol. 797, pp. 172-18,
2015.
[11] Y . Cai and Y . Nosochkov, “Dynamical effects due to fringe
field of the magnet in circular accelerators", in Proc.
PA C ’ 0 5 , Knoxville, TN, USA, May 2005, paper MPPE025,
pp. 1907-1909.
[12] “PEP-II: an asymmetric B factory. Conceptual d... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 3 |
8ad1d4fe-8072-4afd-a17b-e57fde84cbbb | 2807.
[15] S. H. Kim, D. W. Carnegie, C. Doose, R. Hogrefe, K. Kim,
and R. Merl, “Statistical analyses of the magnet data for the
Advanced Photon Source storage ring magnets", in Proc.
PA C ’ 9 5 , Dallas, Texas, USA, May 1995, pp. 1310-1315.
[16] C. L. Doose, privat e communication, Mar. 2023.
[17] H. Witter, ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA048.pdf | 3 |
167e9675-da45-4cfd-9e4c-7a3bdfe62b48 | DESIGN STATUS OF THE ELECTRON-ION COLLIDER∗
C. Montag†, E. C. Aschenauer, B. Bhandari, P. Baxevanis, J. S. Berg, W. Bergan, M. Blaskiewicz,
A. Blednykh, Z. Conway, K. A. Drees, A. V. Fedotov, W. Fischer, C. Folz, D. Gassner, X. Gu,
R. Gupta, K. Hamdi, Y. Hao, C. Hetzel, D. Holmes, H. Huang, J. Jamilkowski, D. Kayran,
J... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA049.pdf | 0 |
fb50bcc2-b293-47b2-afb9-a71f0c1cc69e | R. Rimmer, T. Satogata, A. Seryi, M. Wiseman, TJNAF, Newport News, USA,
V. Morozov, F. Lin, Oak Ridge National Laboratory, TN, USA
E. Gianfelice-Wendt, Fermi National Accelerator Laboratory, Batavia, IL, USA,
Y. Cai, Y. Nosochkov, G. Stupakov, M. Sullivan, SLAC, Menlo Park, CA, USA
G. Hoffstaetter, D. Sagan, M. G. Sign... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA049.pdf | 0 |
1d522ea4-33f4-4c6e-869c-17c9c69082b6 | and the overall status of the project, and present the plans
for future activities.
OVERVIEW
The Electron-Ion Collider (EIC) will be built at
BrookhavenNationalLaboratoryinapartnershipbetween
BNLandTJNAF.Theprojectutilizestheexistinginfrastruc-
ture of the Relativistic Heavy Ion Collider (RHIC) accel-
eratorcomplex. Th... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA049.pdf | 0 |
2d1a71c7-7d2c-4993-b534-6cbe47ffd365 | and sPHENIX detectors, respectively. While only the inter-
action region and corresponding detector in IR6 are within
thescopeoftheEIC,asecondinteractionregionishighly
desirable. Therefore,itismandatorytodemonstratethatthe
EIC is indeed capable of supporting two interaction regions,
both in terms of geometric layout an... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA049.pdf | 0 |
07cf8d6d-7c13-4cf1-b56a-1f29127438c8 | radiationlossesto10MW,theelectronbeamintensityhas
tobereducedaccordingly,resultinginacorrespondingre-
duction in luminosity.
HADRON STORAGE RING
Thehadronstoragering(HSR)consistsofamixtureof
the superconducting arcs of the existing RHIC facility, with
some necessary modifications, both to the lattice and layout
of the ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA049.pdf | 0 |
efc56488-212a-4c71-8253-4a051f0ab437 | energyrange[5]. Toaccommodatethelargenumberofhigh
intensity,shortbunches,pre-coated,activelycooledbeam
screens will be inserted into the beam pipes. The copper
coatingofthesesleeveswillreducetheresistivewallheating
tolevelsmanageablebythecryogenicsystem,whileanaddi-
tional amorphous carbon coating will reduce the secon... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA049.pdf | 0 |
3e3b6cf4-1243-4cfe-89e9-6ae8fbecaafe | prove the polarization transmission for protons on the ramp,
four additional Siberian snakes will be installed in the HSR,
bringing the total number to six [10 –12]. Spin tracking sim-
ulations have been performed to demonstrate the feasibility
ofacceleratingpolarized3Heinthisconfiguration[13]. The
spinrotatorsaroundth... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA049.pdf | 1 |
20f26112-4e3c-4e81-b2c2-8f323f494a6d | ationdampingatenergiesbelow10GeV[16]. Inaneffort
to reduce cost, the existing quadrupoles, sextupoles and
dual-planedipolecorrectorsoftheAdvancedPhotonSource
(APS)willbere-usedthroughoutthearcsandmostofthe
straight sections. Dipole magnets as well as a small num-
ber of special quadrupoles for installation in tight spa... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA049.pdf | 1 |
13da6f90-e545-4d29-9b56-7c835b503c15 | A particular challenge in this respect is the generation of
a vertical emittance of about 3 nm (10 percent emittance
coupling)withoutnegativelyaffectingpolarization[23]. Pre-
liminary design of the components of the ESR is underway,
like the SRF cavities [24], vacuum components [25], or
collimators [26].
RAPID CYCLING ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA049.pdf | 1 |
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