RHIC: The World's First High-Energy, Polarized-Proton Collider (423rd Brookhaven Lecture)
Abstract
The Relativistic Heavy Ion Collider (RHIC) at BNL has been colliding polarized proton at a beam energy of 100 billion electron volts (GeV) since 2001. In addition to reporting upon the progress of RHIC polarized-proton program, this talk will focus upon the mechanisms that cause the beam to depolarize and the strategies developed to overcome this. As the world first polarized-proton collider, RHIC is designed to collide polarized protons up to an energy of 250 GeV, thereby providing an unique opportunity to measure the contribution made by the gluon to a proton's spin and to study the spin structure of proton. Unlike other high-energy proton colliders, however, the challenge for RHIC is to overcome the mechanisms that cause partial or total loss of beam polarization, which is due to the interaction of the spin vector with the magnetic fields. In RHIC, two Siberian snakes have been used to avoid these spin depolarizing resonances, which are driven by vertical closed-orbit distortion and vertical betatron oscillations. As a result, polarized-proton beams have been accelerated to 100 GeV without polarization loss, although depolarization has been observed during acceleration from 100 GeV to 205 GeV.
- Authors:
-
- Collider-Accelerator Department
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1005239
- Report Number(s):
- BNL-83200-2007-CP
TRN: US1104101
- DOE Contract Number:
- AC02-98CH10886
- Resource Type:
- Multimedia
- Resource Relation:
- Conference: Brookhaven Lecture Series: 1960 - Present, Brookhaven National Laboratory, Upton, New York (United States), presented on March 28, 2007
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 74 ATOMIC AND MOLECULAR PHYSICS; ACCELERATION; BETATRON OSCILLATIONS; BNL; DEPOLARIZATION; ELECTRONS; GLUONS; HEAVY IONS; MAGNETIC FIELDS; POLARIZATION; PROTONS; SNAKES; SPIN; VECTORS
Citation Formats
Bai, Mei. RHIC: The World's First High-Energy, Polarized-Proton Collider (423rd Brookhaven Lecture). United States: N. p., 2007.
Web.
Bai, Mei. RHIC: The World's First High-Energy, Polarized-Proton Collider (423rd Brookhaven Lecture). United States.
Bai, Mei. Wed .
"RHIC: The World's First High-Energy, Polarized-Proton Collider (423rd Brookhaven Lecture)". United States. https://www.osti.gov/servlets/purl/1005239.
@article{osti_1005239,
title = {RHIC: The World's First High-Energy, Polarized-Proton Collider (423rd Brookhaven Lecture)},
author = {Bai, Mei},
abstractNote = {The Relativistic Heavy Ion Collider (RHIC) at BNL has been colliding polarized proton at a beam energy of 100 billion electron volts (GeV) since 2001. In addition to reporting upon the progress of RHIC polarized-proton program, this talk will focus upon the mechanisms that cause the beam to depolarize and the strategies developed to overcome this. As the world first polarized-proton collider, RHIC is designed to collide polarized protons up to an energy of 250 GeV, thereby providing an unique opportunity to measure the contribution made by the gluon to a proton's spin and to study the spin structure of proton. Unlike other high-energy proton colliders, however, the challenge for RHIC is to overcome the mechanisms that cause partial or total loss of beam polarization, which is due to the interaction of the spin vector with the magnetic fields. In RHIC, two Siberian snakes have been used to avoid these spin depolarizing resonances, which are driven by vertical closed-orbit distortion and vertical betatron oscillations. As a result, polarized-proton beams have been accelerated to 100 GeV without polarization loss, although depolarization has been observed during acceleration from 100 GeV to 205 GeV.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 28 00:00:00 EDT 2007},
month = {Wed Mar 28 00:00:00 EDT 2007}
}