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Title: Comparison of electron cloud simulation and experiments in the high-current experiment

Abstract

A set of experiments has been performed on the High-Current Experiment (HCX) facility at LBNL, in which the ion beam is allowed to collide with an end plate and thereby induce a copious supply of desorbed electrons. Through the use of combinations of biased and grounded electrodes positioned in between and downstream of the quadrupole magnets, the flow of electrons upstream into the magnets can be turned on or off. Properties of the resultant ion beam are measured under each condition. The experiment is modeled via a full three-dimensional, two species (electron and ion) particle simulation, as well as via reduced simulations (ions with appropriately chosen model electron cloud distributions, and a high-resolution simulation of the region adjacent to the end plate). The three-dimensional simulations are the first of their kind and the first to make use of a timestep-acceleration scheme that allows the electrons to be advanced with a timestep that is not small compared to the highest electron cyclotron period. The simulations reproduce qualitative aspects of the experiments, illustrate some unanticipated physical effects, and serve as an important demonstration of a developing simulation capability.

Authors:
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Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director. Office of Science. Office of Fusion Energy Sciences, Lawrence Livermore National Laboratory Contract W-7405-ENG-48; U.S. Department of Defense. Small Business Innovation Research Grant at Tech-X (US)
OSTI Identifier:
835822
Report Number(s):
LBNL-56496; HIFAN 1372
R&D Project: Z46010; TRN: US0500411
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 27 Aug 2004
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 43 PARTICLE ACCELERATORS; AVAILABILITY; CLOUDS; CYCLOTRONS; ELECTRODES; ELECTRONS; ION BEAMS; MAGNETS; QUADRUPOLES; SIMULATION; ELECTRON CLOUD SIMULATIONS HIGH CURRENT

Citation Formats

Cohen, R H, Friedman, A, Covo, M Kireeff, Lund, S M, Molvik, A W, Bieniosek, F M, Seidl, P A, Vay, J -L, Verboncoeur, J, Stoltz, P, and Veitzer, S. Comparison of electron cloud simulation and experiments in the high-current experiment. United States: N. p., 2004. Web. doi:10.2172/835822.
Cohen, R H, Friedman, A, Covo, M Kireeff, Lund, S M, Molvik, A W, Bieniosek, F M, Seidl, P A, Vay, J -L, Verboncoeur, J, Stoltz, P, & Veitzer, S. Comparison of electron cloud simulation and experiments in the high-current experiment. United States. doi:10.2172/835822.
Cohen, R H, Friedman, A, Covo, M Kireeff, Lund, S M, Molvik, A W, Bieniosek, F M, Seidl, P A, Vay, J -L, Verboncoeur, J, Stoltz, P, and Veitzer, S. Fri . "Comparison of electron cloud simulation and experiments in the high-current experiment". United States. doi:10.2172/835822. https://www.osti.gov/servlets/purl/835822.
@article{osti_835822,
title = {Comparison of electron cloud simulation and experiments in the high-current experiment},
author = {Cohen, R H and Friedman, A and Covo, M Kireeff and Lund, S M and Molvik, A W and Bieniosek, F M and Seidl, P A and Vay, J -L and Verboncoeur, J and Stoltz, P and Veitzer, S},
abstractNote = {A set of experiments has been performed on the High-Current Experiment (HCX) facility at LBNL, in which the ion beam is allowed to collide with an end plate and thereby induce a copious supply of desorbed electrons. Through the use of combinations of biased and grounded electrodes positioned in between and downstream of the quadrupole magnets, the flow of electrons upstream into the magnets can be turned on or off. Properties of the resultant ion beam are measured under each condition. The experiment is modeled via a full three-dimensional, two species (electron and ion) particle simulation, as well as via reduced simulations (ions with appropriately chosen model electron cloud distributions, and a high-resolution simulation of the region adjacent to the end plate). The three-dimensional simulations are the first of their kind and the first to make use of a timestep-acceleration scheme that allows the electrons to be advanced with a timestep that is not small compared to the highest electron cyclotron period. The simulations reproduce qualitative aspects of the experiments, illustrate some unanticipated physical effects, and serve as an important demonstration of a developing simulation capability.},
doi = {10.2172/835822},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {8}
}