01 Circular and Linear Colliders
A19 Electron-Hadron Colliders
Paper Title Page
TUOCB2
JLEIC Ultimate Luminosity With Strong Electron Cooling  
 
  • Y. Zhang, Y.S. Derbenev, F. Lin, V.S. Morozov, G.H. Wei
    JLab, Newport News, Virginia, USA
 
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
The de­sign strat­egy of an elec­tron-ion col­lider for reach­ing high lu­mi­nosi­ties is presently based on ap­pli­ca­tion of strong cool­ing of the ion beams dur­ing col­li­sions. In this paper, we pre­sent the main de­sign pa­ra­me­ters for JLEIC, a Jef­fer­son Lab pro­posal of an elec­tron-ion col­lider, to reach ul­ti­mate high lu­mi­nos­ity up to 2x1034 /cm2/s.
 
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WEPIK038 Acceleration of Polarized Protons and Deuterons in the Ion Collider Ring of JLEIC 3014
 
  • V.S. Morozov, Y.S. Derbenev, F. Lin, Y. Zhang
    JLab, Newport News, Virginia, USA
  • Y. Filatov
    MIPT, Dolgoprudniy, Moscow Region, Russia
  • A.M. Kondratenko, M.A. Kondratenko
    Science and Technique Laboratory Zaryad, Novosibirsk, Russia
 
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
The fig­ure-8-shaped ion col­lider ring of Jef­fer­son Lab Elec­tron-Ion Col­lider (JLEIC) is trans­par­ent to the spin. It al­lows one to pre­serve pro­ton and deuteron po­lar­iza­tions using weak sta­bi­liz­ing so­le­noids when ac­cel­er­at­ing the beam up to 100 GeV/c. When the sta­bi­liz­ing so­le­noids are in­tro­duced into the col­lider's lat­tice, the par­ti­cle spins pre­cess about a spin field, which con­sists of the field in­duced by the sta­bi­liz­ing so­le­noids and the zero-in­te­ger spin res­o­nance strength. Dur­ing ac­cel­er­a­tion of the beam, the in­duced spin field is main­tained con­stant while the res­o­nance strength ex­pe­ri­ences sig­nif­i­cant changes in the re­gions of in­ter­fer­ence peaks. The beam po­lar­iza­tion de­pends on the field ramp rate of the arc mag­nets. Its com­po­nent along the spin field is pre­served if ac­cel­er­a­tion is adi­a­batic. We pre­sent the re­sults of our the­o­ret­i­cal analy­sis and nu­mer­i­cal mod­el­ing of the spin dy­nam­ics dur­ing ac­cel­er­a­tion of pro­tons and deuterons in the JLEIC ion col­lider ring. We demon­strate high sta­bil-ity of the deuteron po­lar­iza­tion in fig­ure-8 ac­cel­er­a­tors. We an­a­lyze a change in the beam po­lar­iza­tion when cross­ing the tran­si­tion en­ergy.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK038  
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WEPIK041 Update on the JLEIC Electron Collider Ring Design 3018
 
  • Y.M. Nosochkov, Y. Cai, M.K. Sullivan
    SLAC, Menlo Park, California, USA
  • Y.S. Derbenev, F. Lin, V.S. Morozov, F.C. Pilat, G.H. Wei, Y. Zhang
    JLab, Newport News, Virginia, USA
  • M.-H. Wang
    Self Employment, Private address, USA
 
  Funding: Authored by Jefferson Science Associates, LLC under US DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported by the US DOE Contract DE-AC02-76SF00515.
We pre­sent an up­date on the lat­tice de­sign of the elec­tron ring of the Jef­fer­son Lab Elec­tron-Ion Col­lider (JLEIC). The elec­tron and ion col­lider rings fea­ture a unique fig­ure-8 lay­out pro­vid­ing op­ti­mal con­di­tions for preser­va­tion of beam po­lar­iza­tion. The rings in­clude two arcs and two in­ter­sect­ing long straight sec­tions con­tain­ing a low-beta in­ter­ac­tion re­gion (IR) with spe­cial op­tics for de­tec­tor po­larime­try, elec­tron beam spin ro­ta­tor sec­tions, ion beam cool­ing sec­tions, and RF-cav­ity sec­tions. Re­cent de­vel­op­ment of the elec­tron ring lat­tice has been fo­cused on min­i­miz­ing the beam emit­tance while pro­vid­ing an ef­fi­cient non-lin­ear chro­matic­ity cor­rec­tion and large dy­namic aper­ture. We de­scribe and com­pare three lat­tice de­signs, from which we de­ter­mine the best op­tion.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK041  
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WEPIK043 Modeling Local Crabbing Dynamics in the JLEIC Ion Collider Ring 3022
 
  • S.I. Sosa Guitron, J.R. Delayen
    ODU, Norfolk, Virginia, USA
  • V.S. Morozov
    JLab, Newport News, Virginia, USA
 
  The Jef­fer­son Lab Elec­tron-Ion Col­lider (JLEIC) de­sign con­sid­ers a 50 mrad cross­ing angle at the In­ter­ac­tion Point. With­out ap­pro­pri­ate com­pen­sa­tion, this could geo­met­ri­cally re­duce the lu­mi­nos­ity by an order of mag­ni­tude. A local crab­bing scheme is im­ple­mented to avoid the lu­mi­nos­ity loss: crab cav­i­ties are placed at both sides of the in­ter­ac­tion re­gion to re­store a head-on col­li­sion sce­nario. In this con­tri­bu­tion, we re­port on the im­ple­men­ta­tion of a local crab­bing scheme in the JLEIC ion ring. The ef­fects of this cor­rec­tion scheme on the sta­bil­ity of pro­ton bunches are an­a­lyzed using the par­ti­cle track­ing soft­ware el­e­gant.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK043  
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WEPIK044 Effects of Crab Cavitiy Multipoles on JLEIC Ion Ring Dynamic Aperture 3025
 
  • S.I. Sosa Guitron, S.U. De Silva, J.R. Delayen
    ODU, Norfolk, Virginia, USA
  • V.S. Morozov
    JLab, Newport News, Virginia, USA
 
  We study the ef­fects of crab cav­ity mul­ti­pole fields on the beam dy­namic aper­ture of the Jef­fer­son Lab Elec­tron-Ion Col­lider (JLEIC) ion ring. Crab cav­i­ties are needed to com­pen­sate for lu­mi­nos­ity loss due to a 50 mrad cross­ing angle at the in­ter­ac­tion point. New com­pact crab cav­ity de­signs are in­ter­est­ing as they do not re­quire con­sid­er­able space in the ring but their non-lin­ear field needs to be well un­der­stood. In this con­tri­bu­tion, we study the im­pact of field mul­ti­poles on the beam dy­namic aper­ture and re­port tol­er­ance val­ues for crab cav­ity mul­ti­poles.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK044  
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WEPIK047 Frequency Choice Studies of eRHIC Crab Cavity 3028
 
  • Y. Hao, Y. Luo, V. Ptitsyn
    BNL, Upton, Long Island, New York, USA
  • J. Qiang
    LBNL, Berkeley, California, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Crab cross­ing scheme is es­sen­tial col­li­sion scheme to achieve high lu­mi­nos­ity for the fu­ture elec­tron-ion col­lider (EIC). Since the ion beam is long when cool­ing is not pre­sent, the non­lin­ear de­pen­dence of the crab­bing kick may pre­sent a chal­lenge to the beam dy­nam­ics of the ion beam, hence a im­pact to the lu­mi­nos­ity life­time. In this paper, we pre­sent the ini­tial re­sult of the weak-strong and strong-strong beam-beam track­ing with the crab cross­ing scheme. The re­sult pro­vides beam dy­nam­ics guid­ance in choos­ing the proper fre­quency the crab cav­ity for the fu­ture EIC.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK047  
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WEPIK048 Evaluation and Mitigation of Synchrotron Radiation Background in the eRHIC Ring-Ring Interaction Region 3032
 
  • C. Montag
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Syn­chro­tron ra­di­a­tion is a po­ten­tial source of back­ground in the de­tec­tor of any fu­ture elec­tron-ion col­lider. In the case of the eRHIC ring-ring de­sign, a 22m­rad cross­ing angle elim­i­nates the need for a sep­a­ra­tor di­pole, which would oth­er­wise be a major source of syn­chro­tron ra­di­a­tion. How­ever, elec­trons in the trans­verse tails ex­pe­ri­ence strong mag­netic fields in the low-beta quadrupoles near the in­ter­ac­tion point. De­spite the low elec­tron den­sity in the tails the re­sult­ing hard ra­di­a­tion gen­er­ated in these strong fields is a major con­cern, and a set of masks needs to be in place to shield the de­tec­tor from these pho­tons. We pre­sent sim­u­la­tion stud­ies and a first de­sign of a syn­chro­tron ra­di­a­tion mask­ing scheme.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK048  
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WEPIK049 Overview of the eRHIC Ring-Ring Design 3035
 
  • C. Montag, G. Bassi, J. Beebe-Wang, J.S. Berg, M. Blaskiewicz, J.M. Brennan, A.V. Fedotov, W. Fischer, W. Guo, Y. Hao, A. Hershcovitch, Y. Luo, F. Méot, R.B. Palmer, B. Parker, S. Peggs, V. Ptitsyn, V.H. Ranjbar, S. Seletskiy, T.V. Shaftan, V.V. Smaluk, S. Tepikian, D. Trbojevic, E. Wang, F.J. Willeke, H. Witte, Q. Wu
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The ring-ring elec­tron-ion col­lider eRHIC aims at an elec­tron-ion lu­mi­nos­ity in the range from 1032 to 1033cm-2sec-1 over a cen­ter-of-mass en­ergy range from 20 to 140GeV. To min­i­mize the tech­ni­cal risk the de­sign is based on ex­ist­ing tech­nolo­gies and beam pa­ra­me­ters that have al­ready been achieved rou­tinely in hadron-hadron col­li­sions at RHIC, and in elec­tron-positron col­li­sions else­where. This de­sign has evolved con­sid­er­ably over the last two years, and a high level of ma­tu­rity has been achieved. We will pre­sent the lat­est de­sign sta­tus and give an overview of stud­ies to­wards eval­u­at­ing the fea­si­bil­ity.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK049  
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WEPIK050 Parameters for eRHIC 3038
 
  • R.B. Palmer, C. Montag
    BNL, Upton, Long Island, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
Re­quire­ments for the pro­posed BNL eRHIC Ring-Ring Elec­tron Ion Col­lider (EIC) are dis­cussed, to­gether with the de­pen­dence of lu­mi­nos­ity with the beam di­ver­gence and for­ward pro­ton ac­cep­tance. Pa­ra­me­ters are given for four cases. The first two use no cool­ing and could rep­re­sent a first phase of op­er­a­tion. The next two use strong cool­ing and in­creased beam cur­rents. In each case pa­ra­me­ters are given that 1) meets the re­quire­ment for for­ward pro­ton ac­cep­tance, and 2) has some­what higher di­ver­gences giv­ing some­what higher lu­mi­nos­ity.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK050  
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