Author: Wang, G.
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TUPAM1R1
 Observation of the Ion Imprint in CeC Electron Beam  
 
  • V. Litvinenko, J.C. Brutus, P. Inacker, Y.C. Jing, J. Ma, I. Petrushina, I. Pinayev, G. Wang
    BNL, Upton, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886.
Process of imprinting density microbunching (perturbation) in co-moving electron beam in one the key processed in Coherent electron Cooling. We present results of experimental observation of such imprint in electron beam from 26.5 GeV/u ions circulating RHIC storage ring. 		 
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TUPAM2R2
 Experimental Demonstration of High-Gain Plasma Cascade Amplifier  
 
  • V. Litvinenko, J.C. Brutus, C.M. Degen, P. Inacker, Y.C. Jing, J. Ma, R.J. Michnoff, I. Petrushina, I. Pinayev, K. Shih, G. Wang
    BNL, Upton, New York, USA
  
  Plasma-Cascade micro-bunching Amplifier has potential of providing largest bandwidth for boosting ion imprint in Coherent electron Cooling systems. We present results of experimental demonstration of High gain Plasma Cascade Amplifier in the Coherent electron Cooling experiment system at BNL. We present results our simulation, experimental set-up and analysis of our measurements.  
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WEPAM1R2
 Advances and Challenges in Coherent Electron Cooling Experiment at RHIC  
 
  • V. Litvinenko
    Stony Brook University, Stony Brook, USA
  • J.C. Brutus, D. Chan, A.J. Curcio, L. DeSanto, K. Decker, A. Di Lieto, K.A. Drees, R.L. Hulsart, M. Ilardo, P. Inacker, Y.C. Jing, D. Kayran, J. Ma, G.J. Mahler, R.J. Michnoff, G. Narayan, L.K. Nguyen, M.C. Paniccia, W.E. Pekrul, I. Petrushina, I. Pinayev, M.P. Sangroula, S. Seletskiy, F. Severino, K. Shih, J. Skaritka, L. Smart, Z. Sorrell, A. Sukhanov, R. Than, G. Wang, D. Weiss, A. Zaltsman
    BNL, Upton, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886.
We discuss current advances and remaining challenges in demonstrating Coherent electron Cooling for 26.5 GeV/u ion beam circulating in Relativistic Heavy Ion Colder, RHIC. Since 2020, the CeC experiment utilizes a 4-cell Plasma Cascade micro-bunching Amplifier (PCA) with bandwidth of 20 THz. We report on results obtained during CeC last four years of CeC experiment, including measurements of ion imprint in electron beam, demonstration of high PCA gain and observation of recombination of electrons and Au ions. While we were unable to clearly established CeC cooling, we clearly observed weak regular electron cooling of 26.5 GeV/u ions - the record energy for electron cooling. We discuss challenges experienced during last runs, improvements to the CeC X system and our plans for demonstration of CeC cooling in near future. 		 
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THPAM2R1
 Towards More Realistic Simulations of the Coherent Electron Cooling Experiment  
 
  • G. Wang, Y.C. Jing, V. Litvinenko, J. Ma
    BNL, Upton, New York, USA
  • V. Litvinenko
    Stony Brook University, Stony Brook, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
The CeC experiment based on the Plasma-cascade Amplifier (PCA) at RHIC will be completed in the next few years. Accurate predicting tools are needed for optimizing the performance of the cooler. In the past, simulations had been carried out separately for the electron beam transport and the cooling force in the common section with only average parameters of the whole electron bunch passed from one to the other. When the electrons are non-uniform and the beam parameters vary substantially along the electron bunch, the cooling force received by an ion strongly depends on its location within the electron bunch. In this work, we divide the cooling electrons into multiple longitudinal slices and the parameters for each slice are calculated, which are then used to calculate the cooling forces through the 3-D PIC simulations. In addition, the cooling forces are calculated at various transverse displacements across the electron bunch. Consequently, we obtain the cooling force which depends both on the longitudinal and transverse location of the ion. We will discuss how the performance of the PCA-based CeC cooler is affected by the non-uniformity of the electron bunch. 		 
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THPAM2R2
 Design to Achieve Uniform Electron Beam in Coherent Electron Cooling  
 
  • Y.C. Jing, A.V. Fedotov, D. Kayran, V. Litvinenko, J. Ma, I. Petrushina, I. Pinayev, S. Seletskiy, K. Shih, G. Wang
    BNL, Upton, New York, USA
  • V. Litvinenko
    Stony Brook University, Stony Brook, USA
  • I. Petrushina
    SUNY SB, Stony Brook, New York, USA
  • K. Shih
    SBU, Stony Brook, New York, USA
  
  The Coherent electron Cooling (CeC) proof of principle experiment requires a high quality electron beam with uniform temporal profile in the cooling section for optimized cooling performance. Due to the nature of strong ballistic compression in the CeC accelerator, a regular initial laser distribution fails to generate such uniform electron beam. Wide choices of initial laser profile with unconventional beam distributions have been studied in simulation. In this paper, we present our findings to possible solution(s) in achieving the uniform electron beam for cooling experiments.  
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THPOSRP01 Influences of the Longitudinal Shift of the Electron Bunch to the Longitudinal Cooling Rate 46
 
  • G. Wang, A.V. Fedotov, D. Kayran
    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 two major techniques of cooling a bunched hadron beam in a storage ring, both coherent electron cooling and rf-based traditional electron cooling involve overlapping the cooling electron bunches with the circulating ion bunch. It is common for the cooling electron bunch to have a longitudinal offset from the center of the ion bunch either due to multiple electron bunches being used for cooling a single ion bunch or for the ions with large synchrotron amplitude to be cooled more efficiently. In this work, we derive how the cooling rate is affected by such a longitudinal offset. We use the EIC pre-cooler as an example to study how different overlapping pattern of the cooling electron bunches, e.g. the number of the cooling electron bunches and their longitudinal positions, affect the evolution of the circulating hadron bunches. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-COOL2023-THPOSRP01  
About • Received ※ 06 October 2023 — Revised ※ 08 October 2023 — Accepted ※ 21 November 2023 — Issued ※ 02 December 2023
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