RHIC EBIS: basics of design and status of commissioning

Pikin, A.; Alessi, J.; Beebe, E.; Kponou, A.; Lambiase, R.; Lockey, R.; Raparia, D.; Ritter, J.; Snydstrup, L.; Tan, Y.

doi:10.1088/1748-0221/5/09/c09003

Cited by 24 publications

(25 citation statements)

References 10 publications

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“…The small magnetic moment of deuterium precludes its direct use in RHIC, but polarized 3 He offers an attractive alternative. Nearly 90% of the time, 3 He is found in its spatially symmetric S-state, in which its protons are in a singlet and the nuclear spin is carried by the neutron. In the context of spin asymmetries then, a polarized 3 He beam can act as a surrogate for a polarized neutron beam, whose magnetic moment allows manipulation in the RHIC rings.…”

Section: Introductionmentioning

confidence: 99%

Development of a Polarized Helium-3 Source for RHIC and eRHIC

Maxwell

Epstein

Milner

et al. 2016

Int. J. Mod. Phys. Conf. Ser.

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The addition of a polarized 3 He ion source for use at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory would enable a host of new measurements, particularly in the context of a planned eRHIC. We are developing such a source using metastability exchange optical pumping to polarize helium-3, which will be then transferred into RHIC's Electron Beam Ion Source for ionization. We aim to deliver nuclear polarization of near 70%, and roughly 10 11 doubly-ionized 3 He ++ ions will be created in each 20 µsec pulse. We discuss the design of the source, and the status of its development.

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Section: Introductionmentioning

confidence: 99%

Development of a Polarized Helium-3 Source for RHIC and eRHIC

Maxwell

Epstein

Milner

et al. 2016

Int. J. Mod. Phys. Conf. Ser.

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“…EBIS charge breeders, while more complicated, have produced better breeding efficiencies and ion beams with fewer contaminants than ECR sources [5,6]. The CARIBU EBIS charge breeder will utilize technology recently developed at Brookhaven National Laboratory (BNL) [7,8], and is largely based on BNL's test EBIS (T-EBIS) [9], whose performance provides an operational baseline. A single charge state breeding efficiency of 17% was reported for 133 Cs þ8 from 133 Cs þ1 at the T-EBIS using a 1.5 A electron beam, an electron beam current density in the trap of 76 A=cm 2 , an electron beam energy of 19 keV, and a breeding time of 5.3 ms [10].…”

Section: Introductionmentioning

confidence: 99%

Simulation and design of an electron beam ion source charge breeder for the californium rare isotope breeder upgrade

Dickerson

Mustapha

Pikin

et al. 2013

Phys. Rev. ST Accel. Beams

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An electron beam ion source (EBIS) will be constructed and used to charge breed ions from the californium rare isotope breeder upgrade (CARIBU) for postacceleration into the Argonne tandem linear accelerator system (ATLAS). Simulations of the EBIS charge breeder performance and the related ion transport systems are reported. Propagation of the electron beam through the EBIS was verified, and the anticipated incident power density within the electron collector was identified. The full normalized acceptance of the charge breeder with a 2 A electron beam, 0:024 mm mrad for nominal operating parameters, was determined by simulating ion injection into the EBIS. The optics of the ion transport lines were carefully optimized to achieve well-matched ion injection, to minimize emittance growth of the injected and extracted ion beams, and to enable adequate testing of the charge bred ions prior to installation in ATLAS.

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“…Deformed nuclei collisions such as U+U will allows us to investigate the initial conditions, hydrodynamic behavior, path length dependence of partonic energy loss [2][3][4], possible local parity violation [5] and other physics topics beyond what we have learned from Au+Au collisions. The commissioning of the Electron Beam Ion Sources [6] will enable RHIC to collide Uranium ions. U+U collisions are being planned for 2012 with center of mass energy around 200 GeV [7].…”

Section: Introductionmentioning

confidence: 99%

Multiplicity, average transverse momentum, and azimuthal anisotropy in U+U collisions atSNN=200GeV using a multiphase transport mode

2012

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Using a multi-phase transport (AMPT) model that includes the implementation of deformed Uranium nuclei, we have studied the centrality dependence of the charged particle multiplicity (N ch , dN ch /dη), average transverse momentum ( pT ), eccentricity (ε2), triangularity (ε3), their fluctuations, elliptic flow (v2) and triangular flow (v3) for different configurations of U+U collisions at midrapidity for √ sNN = 200 GeV. The calculations have been done for both the default and string melting versions of the AMPT model. The results are compared to the corresponding observations from Au+Au collisions. We find that for the U+U collisions the dN ch /dη at midrapidity is enhanced by about 15-40% depending on the collision and model configuration chosen, compared to Au+Au collisions. Within the several configurations studied, the tip-to-tip collisions leads to the largest values of N ch , transverse energy (ET) and pT . The ε2 and its fluctuation shows a rich centrality dependence, whereas not much variations are observed for ε3 and its fluctuations. The U+U sideon-side collision configuration provides maximum values of ε2 and minimum values of eccentricity fluctuations, whereas for peripheral collisions and mid-central collisions minimum values of ε2 and maximum value of eccentricity fluctuations are observed for body-to-body configuration and the tip-to-tip configuration has minimum value of ε2 and maximum value of eccentricity fluctuations for central collisions. The calculated v2 closely correlates with the eccentricity in the model. It is smallest for the body-to-body configuration in peripheral and mid-central collisions while it is minimum for tip-to-tip configuration in central collisions. For peripheral collisions the v2 in U+U can be about 40% larger than in Au+Au whereas for central collisions it can be a factor 2 higher depending on the collision configuration. It is also observed that the v3(pT) is higher for tip-to-tip and body-to-body configurations compared to other systems for the collision centrality studied.

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RHIC EBIS: basics of design and status of commissioning

Cited by 24 publications

References 10 publications

Development of a Polarized Helium-3 Source for RHIC and eRHIC

Development of a Polarized Helium-3 Source for RHIC and eRHIC

Simulation and design of an electron beam ion source charge breeder for the californium rare isotope breeder upgrade

Multiplicity, average transverse momentum, and azimuthal anisotropy in U+U collisions atSNN=200GeV using a multiphase transport mode

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