Paper | Title | Page |
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MOOHC2 | The US Electron Ion Collider Accelerator Designs | 1 |
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With the completion of the National Academies of Sciences Assessment of a US Electron-Ion Collider, the prospects for construction of such a facility have taken a step forward. This paper provides an overview of the two site-specific EIC designs: JLEIC (Jefferson Lab) and eRHIC (BNL) as well as brief overview of ongoing EIC R&D. | ||
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Slides MOOHC2 [14.774 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-MOOHC2 | |
About • | paper received ※ 29 August 2019 paper accepted ※ 04 September 2019 issue date ※ 08 October 2019 | |
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MOYBA4 | eRHIC Design Update | 18 |
TUPLO11 | use link to see paper's listing under its alternate paper code | |
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Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The future electron-ion collider (EIC) aims at an electron-proton luminosity of 1033 to 1034 cm-2 sec-1 and a center-of-mass energy range from 20 to 140 GeV. The eRHIC design has been continuously evolving over a couple of years and has reached a considerable level of maturity. The concept is generally conservative with very few risk items which are mitigated in various ways. |
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Slides MOYBA4 [5.466 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-MOYBA4 | |
About • | paper received ※ 24 August 2019 paper accepted ※ 31 August 2019 issue date ※ 08 October 2019 | |
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MOYBA6 | Accelerator Performance During the Beam Energy Scan II at RHIC in 2019 | 26 |
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Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. RHIC provided Au-Au collisions at beam energies of 9.8, 7.3, 4.59 and 3.85 GeV/nucleon during the first year of the Beam Energy Scan II in 2019. The physics goals at the first two higher beam energies were achieved. At the two lower beam energies, bunched electron beam cooling has been demonstrated successfully. The accelerator performance was improved compared to when RHIC was operated at these energies in earlier years. This article will introduce the challenges to operate RHIC at low energies and the corresponding countermeasures, and review the improvement of accelerator performance during the operation in 2019. |
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Slides MOYBA6 [6.579 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-MOYBA6 | |
About • | paper received ※ 21 August 2019 paper accepted ※ 06 September 2019 issue date ※ 08 October 2019 | |
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TUPLO05 | Fixed Target Operation at RHIC in 2019 | 542 |
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Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. RHIC operated in fixed target mode at beam energies 4.59, 7.3, and 31.2 GeV/nucleon in 2019 as a part of the Beam Energy Scan II program. To scrape beam halo effectively at the fixed target which is 2.05 m away from the center of the STAR detectors, lattice design with relative large beta function at STAR was implemented at the two lower energies. The kickers of the base-band tune (BBQ) measurement system were engaged to dilute the beam transversely to maintain the event rate except for 31.2 GeV/nucleon. In addition, beam orbit control, tune and chromaticity adjustments were used to level the event rate. This paper will review the operational experience of RHIC in fixed target mode at various energies. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-TUPLO05 | |
About • | paper received ※ 21 August 2019 paper accepted ※ 15 September 2019 issue date ※ 08 October 2019 | |
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WEPLS11 | Simulation of Transparent Spin Experiment in RHIC | 789 |
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Funding: Work supported by the U.S. DOE under Contracts No. DE-AC05-06OR23177 and DE-AC02-98CH10886. The transparent spin mode has been proposed as a new technique for preservation and control of the spin polari-zation of ion beams in a synchrotron. The ion rings of the proposed Jefferson Lab Electron-Ion Collider (JLEIC) adopted this technique in their figure-8 design. The transparent spin mode can also be setup in a racetrack with two identical Siberian snakes. There is a proposal to test the predicted features of the spin transparent mode in Relativistic Heavy Ion Collider (RHIC), which already has all of the necessary hardware capabilities. We have earlier analytically estimated the setup parameters and developed a preliminary experimental plan. In this paper we describe simulation setup and benchmarking for the proposed experiment using a Zgoubi model of RHIC. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2019-WEPLS11 | |
About • | paper received ※ 03 September 2019 paper accepted ※ 05 September 2019 issue date ※ 08 October 2019 | |
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