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Title: Status of RHIC head-on beam-beam compensation project

Abstract

Two electron lenses are under construction for RHIC to partially compensate the head-on beam-beam effect in order to increase both the peak and average luminosities. The final design of the overall system is reported as well as the status of the component design, acquisition, and manufacturing. An overview of the RHIC head-on beam-beam compensation project is given in [1], and more details in [2]. With 2 head-on beam-beam interactions in IP6 and IP8, a third interaction with a low-energy electron beam is added near IP10 to partially compensate the the head-on beam-beam effect. Two electron lenses are under construction, one for each ring. Both will be located in a region common to both beams, but each lens will act only on one beam. With head-on beam-beam compensation up to a factor of two improvement in luminosity is expected together with a polarized source upgrade. The current RHIC polarized proton performance is documented in Ref. [4]. An electron lens (Fig. 1) consists of an DC electron gun, warm solenoids to focus the electron beam during transport, a superconducting main solenoid in which the interaction with the proton beam occurs, steering magnets, a collector, and instrumentation. The main developments in the lastmore » year are given below. The experimental program for polarized program at 100 GeV was expected to be finished by the time the electron lenses are commissioned. However, decadal plans by the RHIC experiments STAR and PHENIX show a continuing interest at both 100 GeV and 250 GeV, and a larger proton beam size has been accommodated in the design (Tab. 1). Over the last year beam and lattice parameters were optimized, and RHIC proton lattices are under development for optimized electron lens performance. The effect of the electron lens magnetic structure on the proton beam was evaluated, and found to be correctable. Experiments were done in RHIC and the Tevatron.« less

Authors:
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Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
DOE - Office Of Science
OSTI Identifier:
1011455
Report Number(s):
BNL-94072-2011-CP
R&D Project: KBCH139; 18026; KB0202011; TRN: US1102176
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: 2011 Particle Accelerator Conference (PAC'11); New York, NY; 20110328 through 20110401
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; BEAM-BEAM INTERACTIONS; CONSTRUCTION; DESIGN; ELECTRON BEAMS; ELECTRON GUNS; ELECTRONS; FERMILAB TEVATRON; LATTICE PARAMETERS; LENSES; LUMINOSITY; MAGNETS; MANUFACTURING; PERFORMANCE; PROTON BEAMS; PROTONS; SOLENOIDS; TRANSPORT

Citation Formats

Fischer, W, Anerella, M, Beebe, E, Bruno, D, Gassner, D M, Gu, X, Gupta, R C, Hock, J, Jain, A K, Lambiase, R, Liu, C, Luo, Y, Mapes, M, Montag, C, Oerter, B, Okamura, M, Pikin, A I, Raparia, D, Tan, Y, Than, R, Thieberger, P, Tuozzolo, J, and Zhang, W. Status of RHIC head-on beam-beam compensation project. United States: N. p., 2011. Web.
Fischer, W, Anerella, M, Beebe, E, Bruno, D, Gassner, D M, Gu, X, Gupta, R C, Hock, J, Jain, A K, Lambiase, R, Liu, C, Luo, Y, Mapes, M, Montag, C, Oerter, B, Okamura, M, Pikin, A I, Raparia, D, Tan, Y, Than, R, Thieberger, P, Tuozzolo, J, & Zhang, W. Status of RHIC head-on beam-beam compensation project. United States.
Fischer, W, Anerella, M, Beebe, E, Bruno, D, Gassner, D M, Gu, X, Gupta, R C, Hock, J, Jain, A K, Lambiase, R, Liu, C, Luo, Y, Mapes, M, Montag, C, Oerter, B, Okamura, M, Pikin, A I, Raparia, D, Tan, Y, Than, R, Thieberger, P, Tuozzolo, J, and Zhang, W. Mon . "Status of RHIC head-on beam-beam compensation project". United States. https://www.osti.gov/servlets/purl/1011455.
@article{osti_1011455,
title = {Status of RHIC head-on beam-beam compensation project},
author = {Fischer, W and Anerella, M and Beebe, E and Bruno, D and Gassner, D M and Gu, X and Gupta, R C and Hock, J and Jain, A K and Lambiase, R and Liu, C and Luo, Y and Mapes, M and Montag, C and Oerter, B and Okamura, M and Pikin, A I and Raparia, D and Tan, Y and Than, R and Thieberger, P and Tuozzolo, J and Zhang, W},
abstractNote = {Two electron lenses are under construction for RHIC to partially compensate the head-on beam-beam effect in order to increase both the peak and average luminosities. The final design of the overall system is reported as well as the status of the component design, acquisition, and manufacturing. An overview of the RHIC head-on beam-beam compensation project is given in [1], and more details in [2]. With 2 head-on beam-beam interactions in IP6 and IP8, a third interaction with a low-energy electron beam is added near IP10 to partially compensate the the head-on beam-beam effect. Two electron lenses are under construction, one for each ring. Both will be located in a region common to both beams, but each lens will act only on one beam. With head-on beam-beam compensation up to a factor of two improvement in luminosity is expected together with a polarized source upgrade. The current RHIC polarized proton performance is documented in Ref. [4]. An electron lens (Fig. 1) consists of an DC electron gun, warm solenoids to focus the electron beam during transport, a superconducting main solenoid in which the interaction with the proton beam occurs, steering magnets, a collector, and instrumentation. The main developments in the last year are given below. The experimental program for polarized program at 100 GeV was expected to be finished by the time the electron lenses are commissioned. However, decadal plans by the RHIC experiments STAR and PHENIX show a continuing interest at both 100 GeV and 250 GeV, and a larger proton beam size has been accommodated in the design (Tab. 1). Over the last year beam and lattice parameters were optimized, and RHIC proton lattices are under development for optimized electron lens performance. The effect of the electron lens magnetic structure on the proton beam was evaluated, and found to be correctable. Experiments were done in RHIC and the Tevatron.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {3}
}

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