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Title: An ergodic approach to polarization in eRHIC electron storage ring

Abstract

Electron polarization in a storage ring is subject to two long term effects: Sokolov-Ternov polarization and depolarization by diffusion, which over a long time scale lead to an equilibrium state. Simulation-wise, this can be highly CPU time and memory consuming. Simulations aimed at determining optimal ring storage energy in an electron-ion collider use to track thousand particle bunches, for a long time - yet still short compared to depolarization time scales, due to HPC limitations. Based on considerations of ergodicity of electron bunch dynamics in the presence of synchrotron radiation, tracking a single particle instead is investigated. This allows substantial saving in teh required HPC volume, “CPU-time×Memory-allocation”. The concept is illustrated with polarization lifetime and equilibrium polarization simulations at the eRHIC electron-ion collider.

Authors:
 [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1480979
Report Number(s):
eRHIC/-59; BNL-209351-2018-TECH
DOE Contract Number:  
SC0012704
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Meot, Francois. An ergodic approach to polarization in eRHIC electron storage ring. United States: N. p., 2018. Web. doi:10.2172/1480979.
Meot, Francois. An ergodic approach to polarization in eRHIC electron storage ring. United States. doi:10.2172/1480979.
Meot, Francois. Fri . "An ergodic approach to polarization in eRHIC electron storage ring". United States. doi:10.2172/1480979. https://www.osti.gov/servlets/purl/1480979.
@article{osti_1480979,
title = {An ergodic approach to polarization in eRHIC electron storage ring},
author = {Meot, Francois},
abstractNote = {Electron polarization in a storage ring is subject to two long term effects: Sokolov-Ternov polarization and depolarization by diffusion, which over a long time scale lead to an equilibrium state. Simulation-wise, this can be highly CPU time and memory consuming. Simulations aimed at determining optimal ring storage energy in an electron-ion collider use to track thousand particle bunches, for a long time - yet still short compared to depolarization time scales, due to HPC limitations. Based on considerations of ergodicity of electron bunch dynamics in the presence of synchrotron radiation, tracking a single particle instead is investigated. This allows substantial saving in teh required HPC volume, “CPU-time×Memory-allocation”. The concept is illustrated with polarization lifetime and equilibrium polarization simulations at the eRHIC electron-ion collider.},
doi = {10.2172/1480979},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {10}
}