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in subjects: "Space Charge Relativistic Heavy Ion Collider"

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Simulation study of beam-beam effects in ion beams with large space charge tuneshift

During low-energy operations with gold-gold collisions at 3.85 GeV beam energy, significant beam lifetime reductions have been observed due to the beam-beam interaction in the presence of large space charge tuneshifts. These beam-beam tuneshift parameters were about an order of magnitude smaller than during regular high energy operations. To get a better understanding of this effect, simulations have been performed. Recent results are presented.

Date: May 20, 2012

Creator: Montag, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Multiple error data analysis for RHIC low-energy operations

In FY10, RHIC operated with gold beams at three different energies below its regular injection energy, namely at {radical}s = 5 GeV; 7.7 GeV; and 11.5 GeV: While beam lifetimes of about 10 minutes were achieved at 11.5 GeV and 7.7 GeV; leading to stable collider operation, beam lifetimes during tests at {radical}s = 5 GeV were only of the order of several seconds. Though space charge effects are a major concern in low energy operations due to the 1/{gamma}{sup 2} scaling of the space charge for… more

Date: January 1, 2011

Creator: Montag, C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Interplay of space-charge and beam-beam effects in a collider

Operation of a collider at low energy or use of cooling techniques to increase beam density may result in luminosity limitation due to the space-charge effects. Understanding of such limitation became important for Low-Energy RHIC physics program with heavy ions at the center of mass energies of 5-20 GeV/nucleon. For a collider, we are interested in a long beam lifetime, which limits the allowable space-charge tune shift. An additional complication comes from the fact that ion beams are collidi… more

Date: September 27, 2010

Creator: Fedotov, A. V.; Blaskiewicz, M.; Fischer, W.; Satogata, T. & Tepikian, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Ion Optics of RHIC EBIS

RHIC EBIS has been commissioned to operate as a versatile ion source on RHIC injection facility supplying ion species from He to Au for Booster. Except for light gaseous elements RHIC EBIS employs ion injection from several external primary ion sources. With electrostatic optics fast switching from one ion species to another can be done on a pulse to pulse mode. The design of an ion optical structure and the results of simulations for different ion species are presented. In the choice of optica… more

Date: September 10, 2011

Creator: Pikin, A.; Alessi, J.; Beebe, E.; Kponou, A.; Okamura, M.; Raparia, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Potential for luminosity improvement for low-energy RHIC operation

At the Brookhaven National Laboratory, a physics program, motivated by the search of the QCD phase transition critical point, requires operation of the Relativistic Heavy Ion Collider (RHIC) with heavy ions at very low beam energies corresponding to 2.5-20 GeV/n. Several physics runs were already successfully performed at these low energies. However, the luminosity is very low at lowest energies of interest (< 10 GeV/n) limited by the intra-beam scattering and space-charge, as well as by mac… more

Date: May 20, 2012

Creator: V., Fedotov A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A mulitple cathode gun design for the eRHIC polarized electron source

The future electron-ion collider eRHIC requires a high average current ({approx}50 mA), short bunch ({approx}3 mm), low emittance ({approx}20 {micro}m) polarized electron source. The maximum average current of a polarized electron source so far is more than 1 mA, but much less than 50 mA, from a GaAs:Cs cathode. One possible approach to overcome the average current limit and to achieve the required 50 mA beam for eRHIC, is to combine beamlets from multiple cathodes to one beam. In this paper, w… more

Date: March 28, 2011

Creator: Chang, X.; Ben-Zvi, Ilan; Kewisch, J.; Litvinenko, V.; Pikin, A.; Ptitsyn, V. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department