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Title: Time evolution of the luminosity of colliding heavy-ion beams in BNL Relativistic Heavy Ion Collider and CERN Large Hadron Collider

Abstract

We have studied the time evolution of the heavy ion luminosity and bunch intensities in the Relativistic Heavy Ion Collider (RHIC), at BNL, and in the Large Hadron Collider (LHC), at CERN. First, we present measurements from a large number of RHIC stores (from Run 7), colliding 100 GeV/nucleon {sup 197}Au{sup 79}+ beams without stochastic cooling. These are compared with two different calculation methods. The first is a simulation based on multi-particle tracking taking into account collisions, intrabeam scattering, radiation damping, and synchrotron and betatron motion. In the second, faster, method, a system of ordinary differential equations with terms describing the corresponding effects on emittances and bunch populations is solved numerically. Results of the tracking method agree very well with the RHIC data. With the faster method, significant discrepancies are found since the losses of particles diffusing out of the RF bucket due to intrabeam scattering are not modeled accurately enough. Finally, we use both methods to make predictions of the time evolution of the future {sup 208}Pb+{sup 82+} beams in the LHC at injection and collision energy. For this machine, the two methods agree well.

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider
Sponsoring Org.:
DOE - Office Of Science
OSTI Identifier:
991724
Report Number(s):
BNL-94129-2010-JA
R&D Project: KBCH139; 18031; KB0202011; TRN: US1007548
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Review Special Topics: Accelerators and Beams
Additional Journal Information:
Journal Volume: 13; Journal Issue: 9
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BETATRONS; BNL; CALCULATION METHODS; CERN; DAMPING; DIFFERENTIAL EQUATIONS; HADRONS; HEAVY IONS; LUMINOSITY; RADIATIONS; SCATTERING; SIMULATION; STOCHASTIC COOLING; SYNCHROTRONS; relativistic heavy ion collider

Citation Formats

Bruce, R, Blaskiewicz, M, Jowett, J M, and Fischer, W. Time evolution of the luminosity of colliding heavy-ion beams in BNL Relativistic Heavy Ion Collider and CERN Large Hadron Collider. United States: N. p., 2010. Web. doi:10.1103/PhysRevSTAB.13.091001.
Bruce, R, Blaskiewicz, M, Jowett, J M, & Fischer, W. Time evolution of the luminosity of colliding heavy-ion beams in BNL Relativistic Heavy Ion Collider and CERN Large Hadron Collider. United States. doi:10.1103/PhysRevSTAB.13.091001.
Bruce, R, Blaskiewicz, M, Jowett, J M, and Fischer, W. Tue . "Time evolution of the luminosity of colliding heavy-ion beams in BNL Relativistic Heavy Ion Collider and CERN Large Hadron Collider". United States. doi:10.1103/PhysRevSTAB.13.091001.
@article{osti_991724,
title = {Time evolution of the luminosity of colliding heavy-ion beams in BNL Relativistic Heavy Ion Collider and CERN Large Hadron Collider},
author = {Bruce, R and Blaskiewicz, M and Jowett, J M and Fischer, W},
abstractNote = {We have studied the time evolution of the heavy ion luminosity and bunch intensities in the Relativistic Heavy Ion Collider (RHIC), at BNL, and in the Large Hadron Collider (LHC), at CERN. First, we present measurements from a large number of RHIC stores (from Run 7), colliding 100 GeV/nucleon {sup 197}Au{sup 79}+ beams without stochastic cooling. These are compared with two different calculation methods. The first is a simulation based on multi-particle tracking taking into account collisions, intrabeam scattering, radiation damping, and synchrotron and betatron motion. In the second, faster, method, a system of ordinary differential equations with terms describing the corresponding effects on emittances and bunch populations is solved numerically. Results of the tracking method agree very well with the RHIC data. With the faster method, significant discrepancies are found since the losses of particles diffusing out of the RF bucket due to intrabeam scattering are not modeled accurately enough. Finally, we use both methods to make predictions of the time evolution of the future {sup 208}Pb+{sup 82+} beams in the LHC at injection and collision energy. For this machine, the two methods agree well.},
doi = {10.1103/PhysRevSTAB.13.091001},
journal = {Physical Review Special Topics: Accelerators and Beams},
number = 9,
volume = 13,
place = {United States},
year = {2010},
month = {9}
}