ELECTRON COOLING SIMULATIONS FOR LOW-ENERGY RHIC OPERATION.

Conference · Mon Sep 10 04:00:00 EDT 2007

OSTI ID:918594

FEDOTOV, A V; BEN-ZVI, I; CHANG, X; KAYRAN, D; SATOGATA, T

Recently, a strong interest emerged in running the Relativistic Heavy Ion Collider (RHIC) at low beam total energies of 2.5-25 GeV/nucleon, substantially lower than the nominal beam total energy of 100 GeV/nucleon. Collisions in this low energy range are motivated by one of the key questions of quantum chromodynamics (QCD) about the existence and location of critical point on the QCD phase diagram. Applying electron cooling directly at these low energies in RHIC would result in significant luminosity increase and long beam stores for physics. Without direct cooling in RHIC at these low energies, beam lifetime and store times are very short, limited by strong transverse and longitudinal intrabeam scattering (IBS). In addition, for the lowest energies of the proposed energy scan, the longitudinal emittance of ions injected from the AGS into RHIC may be too big to fit into the RHIC RF bucket. An improvement in the longitudinal emittance of the ion beam can be provided by an electron cooling system at the AGS injection energy. Simulations of electron cooling both for direct cooling at low energies in RHIC and for injection energy cooling in the AGS were performed and are summarized in this report.

• Research Organization: Brookhaven National Laboratory
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 918594
• Report Number(s): BNL--78081-2007-CP; KB0202011
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BEAM COOLING
ELECTRON COOLING
ENERGY RANGE
HEAVY IONS
ION BEAMS
LIFETIME
LUMINOSITY
PHASE DIAGRAMS
PHYSICS
QUANTUM CHROMODYNAMICS
SCATTERING