Author: Polizzo, S.
Paper Title Page
MOPAB009 Review of the Fixed Target Operation at RHIC in 2020 69
 
  • C. Liu, P. Adams, E.N. Beebe, S. Binello, I. Blackler, M. Blaskiewicz, K.A. Brown, D. Bruno, B.D. Coe, K.A. Drees, A.V. Fedotov, W. Fischer, C.J. Gardner, C.E. Giorgio, X. Gu, T. Hayes, K. Hock, H. Huang, R.L. Hulsart, T. Kanesue, D. Kayran, N.A. Kling, B. Lepore, Y. Luo, D. Maffei, G.J. Marr, A. Marusic, K. Mernick, R.J. Michnoff, M.G. Minty, J. Morris, C. Naylor, S. Nemesure, M. Okamura, I. Pinayev, S. Polizzo, D. Raparia, G. Robert-Demolaize, T. Roser, J. Sandberg, V. Schoefer, S. Seletskiy, F. Severino, T.C. Shrey, P. Thieberger, M. Valette, A. Zaltsman, I. Zane, K. Zeno, W. Zhang
    BNL, Upton, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
As part of the Beam En­ergy Scan (BES) physics pro­gram, RHIC op­er­ated in Fixed Tar­get mode at var­i­ous beam en­er­gies in 2020. The fixed tar­get ex­per­i­ment, achieved by scrap­ing the beam halo of the cir­cu­lat­ing beam on a gold ring in­serted in the beam pipe up­stream of the ex­per­i­men­tal de­tec­tors, ex­tends the range of the cen­ter-of-mass en­ergy for BES. The ma­chine con­fig­u­ra­tion, con­trol of rates, and re­sults of the fixed tar­get ex­per­i­ment op­er­a­tion in 2020 will be pre­sented in this re­port.
 
poster icon Poster MOPAB009 [2.913 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB009  
About • paper received ※ 16 May 2021       paper accepted ※ 17 August 2021       issue date ※ 23 August 2021  
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MOPAB010 RHIC Beam Energy Scan Operation with Electron Cooling in 2020 72
 
  • C. Liu, P. Adams, E.N. Beebe, S. Binello, I. Blackler, M. Blaskiewicz, K.A. Brown, D. Bruno, B.D. Coe, K.A. Drees, A.V. Fedotov, W. Fischer, C.J. Gardner, C.E. Giorgio, X. Gu, T. Hayes, K. Hock, H. Huang, R.L. Hulsart, T. Kanesue, D. Kayran, N.A. Kling, B. Lepore, Y. Luo, D. Maffei, G.J. Marr, A. Marusic, K. Mernick, R.J. Michnoff, M.G. Minty, J. Morris, C. Naylor, S. Nemesure, M. Okamura, I. Pinayev, S. Polizzo, D. Raparia, G. Robert-Demolaize, T. Roser, J. Sandberg, V. Schoefer, S. Seletskiy, F. Severino, T.C. Shrey, P. Thieberger, M. Valette, A. Zaltsman, I. Zane, K. Zeno, W. Zhang
    BNL, Upton, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
RHIC pro­vided Au-Au col­li­sions at beam en­er­gies of 5.75 and 4.59 GeV/nu­cleon for the physics pro­gram in 2020 as a part of the Beam En­ergy Scan II ex­per­i­ment. The op­er­a­tional ex­pe­ri­ence at these en­er­gies will be re­ported with em­pha­sis on their unique fea­tures. These unique fea­tures in­clude the ad­di­tion of a third har­monic RF sys­tem to en­able a large lon­gi­tu­di­nal ac­cep­tance at 5.75 GeV/nu­cleon, the ap­pli­ca­tion of ad­di­tional lower fre­quency cav­i­ties for al­le­vi­at­ing space charge ef­fects, and the world-first op­er­a­tion of cool­ing with an RF-ac­cel­er­ated bunched elec­tron beam.
 
poster icon Poster MOPAB010 [3.523 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB010  
About • paper received ※ 17 May 2021       paper accepted ※ 29 July 2021       issue date ※ 10 August 2021  
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MOPAB359 Operational Experience and Redesign of the Tuner without Spring Fingers for the LEReC Warm Cavity 1116
 
  • B.P. Xiao, J.M. Brennan, J.C. Brutus, K. Mernick, S. Polizzo, S.K. Seberg, F. Severino, K.S. Smith, A. Zaltsman
    BNL, Upton, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
A folded coax­ial tuner with­out spring fin­gers was de­signed for the Low En­ergy RHIC elec­tron Cooler (LEReC) 2.1 GHz warm cav­ity. Dur­ing RHIC run 2019, this tuner was found to cause cav­ity trips via dif­fer­ent fail­ure modes. After an­a­lyz­ing these fail­ure modes, a new straight coax­ial tuner with­out spring fin­gers was pro­posed and was in­stalled. We show the op­er­a­tional ex­pe­ri­ence of the new tuner in this paper.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB359  
About • paper received ※ 17 May 2021       paper accepted ※ 25 June 2021       issue date ※ 29 August 2021  
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