RHIC performance with 56 MHz RF and gold ion beams pre-cooled at lower energy

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Presently there is an R&D ERL under construction at Collider-Accelerator Department (CAD) at BNL with its commissioning scheduled for FY09-10 [1]. The use of this full energy 21 MeV ERL in RHIC tunnel was recently proposed for a Proof-of-Principle demonstration of Coherent Electron Cooling of gold ions at 40 GeV/nucleon [2]. The purpose of this Note is to summarize numerical studies aimed at understanding the potential improvement of RHIC luminosity by using this R&D ERL for pre-cooling of Au ion beams with conventional electron cooling system at 40 GeV/nucleon. The constraints were such that electron beam parameters should be close ... continued below

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Fedotov,A. October 1, 2008.

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Presently there is an R&D ERL under construction at Collider-Accelerator Department (CAD) at BNL with its commissioning scheduled for FY09-10 [1]. The use of this full energy 21 MeV ERL in RHIC tunnel was recently proposed for a Proof-of-Principle demonstration of Coherent Electron Cooling of gold ions at 40 GeV/nucleon [2]. The purpose of this Note is to summarize numerical studies aimed at understanding the potential improvement of RHIC luminosity by using this R&D ERL for pre-cooling of Au ion beams with conventional electron cooling system at 40 GeV/nucleon. The constraints were such that electron beam parameters should be close to those expected from R&D ERL. Additionally, the cooling section in RHIC should not require major RHIC modification. As a result of these studies it was found that pre-cooling of gold ion at about 40 GeV/nucleon approximately doubles the average store luminosity of RHIC at top energy of 100 GeV/nucleon compared to the expected luminosity improvement with 56MHz RF upgrade [3, 4]. Significant luminosity improvement may be also gained on top of future expected luminosity performance with combined upgrades of 56MHz RF and all-plane stochastic cooling system with present beam parameters [5]. The electron beam parameters needed for such pre-cooling (see Table 1) are close to those expected from the R&D ERL which is presently under construction at BNL. With electron beam parameters from Table 1 it takes about 20 minutes to cool the transverse emittance of gold ions by a factor of two at 40 GeV/nucleon. Similar studies were done for protons as well. However, it was found that the electron beam parameters needed for pre-cooling of protons would require a significant upgrade of the present injector of the R&D ERL. Thus, discussion about protons is omitted from the present Note.

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  • Report No.: BNL--81723-2008-IR
  • Grant Number: DE-AC02-98CH10886
  • DOI: 10.2172/944959 | External Link
  • Office of Scientific & Technical Information Report Number: 944959
  • Archival Resource Key: ark:/67531/metadc896925

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  • October 1, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 1, 2016, 5:32 p.m.

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Fedotov,A. RHIC performance with 56 MHz RF and gold ion beams pre-cooled at lower energy, report, October 1, 2008; United States. (digital.library.unt.edu/ark:/67531/metadc896925/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.