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Title: Evaluation method of beam instability in laser ion source using solenoid

Abstract

In a laser ion source using solenoid field confinement, it is known that an ion beam becomes unstable in the certain range of a magnetic field. Although it is essential to quantify the instability when discussing the unstable region of the beam, it is difficult to evaluate the beam instability by peak current or the amount of charge because an irregular change of temporal profile occurs in addition to the shot-by-shot fluctuation of amplitude. In this study, I propose the most appropriate method to evaluate the beam instability using the difference from an average waveform. The validity of the new method was evaluated by comparing three evaluation methods (variation of maximum value, variation of integral of waveforms, and the proposed evaluation method) with the experimentally obtained waveforms with the stable and unstable regions of a solenoid field. The proposed method was verified to best represent the beam instability by laser-induced plasma.

Authors:
 [1];  [2]
  1. Utsunomiya Univ. (Japan); RIKEN Center for Accelerator-Based Science, Wako (Japan)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1618412
Report Number(s):
BNL-215916-2020-JAAM
Journal ID: ISSN 0034-6748
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 91; Journal Issue: 3; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Faraday cups; Electromagnetic coils; Lasers; Plasma temperature; Plasma instabilities; Ion sources; Plasma heating; Magnetic fields

Citation Formats

Karino, Takahiro, and Kanesue, Takeshi. Evaluation method of beam instability in laser ion source using solenoid. United States: N. p., 2020. Web. https://doi.org/10.1063/1.5129170.
Karino, Takahiro, & Kanesue, Takeshi. Evaluation method of beam instability in laser ion source using solenoid. United States. https://doi.org/10.1063/1.5129170
Karino, Takahiro, and Kanesue, Takeshi. Tue . "Evaluation method of beam instability in laser ion source using solenoid". United States. https://doi.org/10.1063/1.5129170. https://www.osti.gov/servlets/purl/1618412.
@article{osti_1618412,
title = {Evaluation method of beam instability in laser ion source using solenoid},
author = {Karino, Takahiro and Kanesue, Takeshi},
abstractNote = {In a laser ion source using solenoid field confinement, it is known that an ion beam becomes unstable in the certain range of a magnetic field. Although it is essential to quantify the instability when discussing the unstable region of the beam, it is difficult to evaluate the beam instability by peak current or the amount of charge because an irregular change of temporal profile occurs in addition to the shot-by-shot fluctuation of amplitude. In this study, I propose the most appropriate method to evaluate the beam instability using the difference from an average waveform. The validity of the new method was evaluated by comparing three evaluation methods (variation of maximum value, variation of integral of waveforms, and the proposed evaluation method) with the experimentally obtained waveforms with the stable and unstable regions of a solenoid field. The proposed method was verified to best represent the beam instability by laser-induced plasma.},
doi = {10.1063/1.5129170},
journal = {Review of Scientific Instruments},
number = 3,
volume = 91,
place = {United States},
year = {2020},
month = {3}
}

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