Calculating the polarization lifetime from the Thomas-Bargmann-Michel-Telegdi equation
Abstract
It was observed at the Relativistic Heavy Ion Collider that the polarization of the stored beam decays by 0.17 to 3% per hour. This effect could not be simulated up to now since the simulation time for an exact calculation exceeded the computer capacity. To solve this problem the action of the whole arc was considered as one element acting on the spin and not, as before, each optical element in the arc individually (called lattice independent integration). In addition to former simulations the coupling of synchrotron and betatron motions in the beam interaction regions and their action on the polarization were taken into account (called addition of longitudinal dynamics). It is shown that with these two changes the action on the polarization life time can be explained.
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1566891
- Alternate Identifier(s):
- OSTI ID: 1566301
- Report Number(s):
- BNL-212129-2019-JAAM
Journal ID: ISSN 2469-9888; PRABCJ; 091001
- Grant/Contract Number:
- AC02-98CH10886; AC02-05CH11231; SC0012704
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Accelerators and Beams
- Additional Journal Information:
- Journal Name: Physical Review Accelerators and Beams Journal Volume: 22 Journal Issue: 9; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
Citation Formats
Ranjbar, V. H. Calculating the polarization lifetime from the Thomas-Bargmann-Michel-Telegdi equation. United States: N. p., 2019.
Web. doi:10.1103/PhysRevAccelBeams.22.091001.
Ranjbar, V. H. Calculating the polarization lifetime from the Thomas-Bargmann-Michel-Telegdi equation. United States. https://doi.org/10.1103/PhysRevAccelBeams.22.091001
Ranjbar, V. H. Sun .
"Calculating the polarization lifetime from the Thomas-Bargmann-Michel-Telegdi equation". United States. https://doi.org/10.1103/PhysRevAccelBeams.22.091001.
@article{osti_1566891,
title = {Calculating the polarization lifetime from the Thomas-Bargmann-Michel-Telegdi equation},
author = {Ranjbar, V. H.},
abstractNote = {It was observed at the Relativistic Heavy Ion Collider that the polarization of the stored beam decays by 0.17 to 3% per hour. This effect could not be simulated up to now since the simulation time for an exact calculation exceeded the computer capacity. To solve this problem the action of the whole arc was considered as one element acting on the spin and not, as before, each optical element in the arc individually (called lattice independent integration). In addition to former simulations the coupling of synchrotron and betatron motions in the beam interaction regions and their action on the polarization were taken into account (called addition of longitudinal dynamics). It is shown that with these two changes the action on the polarization life time can be explained.},
doi = {10.1103/PhysRevAccelBeams.22.091001},
journal = {Physical Review Accelerators and Beams},
number = 9,
volume = 22,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 2019},
month = {Sun Sep 01 00:00:00 EDT 2019}
}
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevAccelBeams.22.091001
https://doi.org/10.1103/PhysRevAccelBeams.22.091001
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FIG. 1: RHIC-AGS complex.
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Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.