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Title: ABSOLUTE MEASUREMENT OF THE POLARIZATION OF HIGH ENERGY PROTON BEAMS AT RHIC

Abstract

The spin physics program at the Relativistic Heavy Ion Collider (RHIC) requires knowledge of the beam polarization to better than 5%. Such a goal is made the more difficult by the lack of knowledge of the analyzing power of high energy nuclear physics processes. To overcome this, a polarized hydrogen jet target was constructed and installed at one intersection region in RHIC where it intersects both beams and utilizes the precise knowledge of the jet atomic hydrogen beam polarization to measure the analyzing power in proton-proton elastic scattering in the Nuclear Coulomb Interference (CNI) region at the prescribed RHIC proton beam energy. The reverse reaction is used to assess the absolute beam polarization. Simultaneous measurements taken with fast high statistics polarimeters that measure the p-Carbon elastic scattering process also in the CNI region use the jet results to calibrate the latter.

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
910389
Report Number(s):
BNL-77350-2007-CP
R&D Project: 18092; TRN: US0704188
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: 22ND PARTICLE ACCELERATOR CONFERENCE; ALBUQUERQUE, NEW MEXICO; 20070625 through 20070629
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 43 PARTICLE ACCELERATORS; ACCELERATORS; ELASTIC SCATTERING; HEAVY IONS; HYDROGEN; NUCLEAR PHYSICS; PHYSICS; POLARIMETERS; POLARIZATION; PROTON BEAMS; SPIN; STATISTICS; TARGETS

Citation Formats

MAKDISI,Y., BRAVAR, A. BUNCE, G. GILL, R., HUANG, H., and ET AL. ABSOLUTE MEASUREMENT OF THE POLARIZATION OF HIGH ENERGY PROTON BEAMS AT RHIC. United States: N. p., 2007. Web.
MAKDISI,Y., BRAVAR, A. BUNCE, G. GILL, R., HUANG, H., & ET AL. ABSOLUTE MEASUREMENT OF THE POLARIZATION OF HIGH ENERGY PROTON BEAMS AT RHIC. United States.
MAKDISI,Y., BRAVAR, A. BUNCE, G. GILL, R., HUANG, H., and ET AL. Mon . "ABSOLUTE MEASUREMENT OF THE POLARIZATION OF HIGH ENERGY PROTON BEAMS AT RHIC". United States. doi:. https://www.osti.gov/servlets/purl/910389.
@article{osti_910389,
title = {ABSOLUTE MEASUREMENT OF THE POLARIZATION OF HIGH ENERGY PROTON BEAMS AT RHIC},
author = {MAKDISI,Y. and BRAVAR, A. BUNCE, G. GILL, R. and HUANG, H. and ET AL.},
abstractNote = {The spin physics program at the Relativistic Heavy Ion Collider (RHIC) requires knowledge of the beam polarization to better than 5%. Such a goal is made the more difficult by the lack of knowledge of the analyzing power of high energy nuclear physics processes. To overcome this, a polarized hydrogen jet target was constructed and installed at one intersection region in RHIC where it intersects both beams and utilizes the precise knowledge of the jet atomic hydrogen beam polarization to measure the analyzing power in proton-proton elastic scattering in the Nuclear Coulomb Interference (CNI) region at the prescribed RHIC proton beam energy. The reverse reaction is used to assess the absolute beam polarization. Simultaneous measurements taken with fast high statistics polarimeters that measure the p-Carbon elastic scattering process also in the CNI region use the jet results to calibrate the latter.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 25 00:00:00 EDT 2007},
month = {Mon Jun 25 00:00:00 EDT 2007}
}

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  • The performance and unique features of the RHIC polarized jet target and our solutions to the important design constraints imposed on the jet by the RHIC environment are described. The target polarization and thickness were measured to be 0.924 {+-} 2% and 1.3 {+-} 0.2 x 10{sup 12} atoms/cm{sup 2} respectively.
  • We have now seen the first results from experiments with high energy nuclear beams at Brookhaven and CERN. These experiments, which began about a year ago, use fixed targets at the AGS and SPS. These programs have begun with relatively light ions (A less than or equal to 32 amu) to explore states of compressed nuclear matter in which high energy density is achieved in an environment of high baryon density at energies near the maximum for nuclear stopping. The widespread interest and excitement which these experiments have generated is due in large part to the fact that they aremore » providing the first glimpse of what is expected to be an entire new regime of physical phenomena, and that these experiments will be followed in the near future by measurements with much higher beam masses and much higher collision energies. This is the mission of the Relativistic Heavy Ion Collider (RHIC) project now being prepared for construction at Brookhaven. In this presentation the author briefly describes the experiments which are now being carried out with ions accelerated in the AGS and the plans for heavier beams in the near future with the completion of the AGS Booster Synchrotron, which is now under construction. The author then discusses the status of the RHIC project.« less
  • The design and proposed experiments are presented for the Relativistic Heavy Ion Collider at Brookhaven. The plans are to begin with relatively light ions (A approx. = 32amu) and to extend over the mass range to A = 200. With these relativistic beams one will be able to investigate thermodynamic conditions with near-zero baryon number which can be compared with quantum chromodynamics. 14 refs., 10 figs., 3 tabs. (WRF)
  • The authors measure the absolute wavefront of Beamlet output pulses and actively correct for slowly varying aberrations present when the power amplifiers are not fired. Provision is also made for active precompensation of pump-induced amplifier aberrations.