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Title: Numerical study on wave-induced beam ion prompt losses in DIII-D tokamak

Abstract

A numerical study is performed on the coherent beam ion prompt losses driven by Alfven eigenmodes (AEs) in DIII-D plasmas using realistic parameters and beam ion deposition profiles. The synthetic signal of a fast-ion loss detector (FILD) is calculated for a single AE mode. The first harmonic of the calculated FILD signal is linearly proportional to the AE amplitude with the same AE frequency in agreement with the experimental measurement. The calculated second harmonic is proportional to the square of the first harmonic for typical AE amplitudes. The coefficient of quadratic scaling is found to be sensitive to the AE mode width. The second part of this work considers the AE drive due to coherent prompt loss. As a result, it is shown that the loss-induced mode drive is much smaller than the previous estimate and can be ignored for mode stability.

Authors:
 [1];  [1]; ORCiD logo [2];  [3];  [4]
  1. Zhejiang Univ., Hangzhou (China)
  2. Zhejiang Univ., Hangzhou (China); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Univ. of California, Irvine, CA (United States)
  4. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Contributing Org.:
Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Zhejiang, Peoples R China; Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China
OSTI Identifier:
1398341
Alternate Identifier(s):
OSTI ID: 1377684
Grant/Contract Number:  
AC02-09CH11466; FC02-04ER54698
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 8; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; toroidal Alfven eigenmodes

Citation Formats

Feng, Zhichen, Zhu, Jia, Fu, Guo -Yong, Heidbrink, W. W., and Van Zeeland, M. A.. Numerical study on wave-induced beam ion prompt losses in DIII-D tokamak. United States: N. p., 2017. Web. doi:10.1063/1.5000073.
Feng, Zhichen, Zhu, Jia, Fu, Guo -Yong, Heidbrink, W. W., & Van Zeeland, M. A.. Numerical study on wave-induced beam ion prompt losses in DIII-D tokamak. United States. doi:10.1063/1.5000073.
Feng, Zhichen, Zhu, Jia, Fu, Guo -Yong, Heidbrink, W. W., and Van Zeeland, M. A.. Wed . "Numerical study on wave-induced beam ion prompt losses in DIII-D tokamak". United States. doi:10.1063/1.5000073. https://www.osti.gov/servlets/purl/1398341.
@article{osti_1398341,
title = {Numerical study on wave-induced beam ion prompt losses in DIII-D tokamak},
author = {Feng, Zhichen and Zhu, Jia and Fu, Guo -Yong and Heidbrink, W. W. and Van Zeeland, M. A.},
abstractNote = {A numerical study is performed on the coherent beam ion prompt losses driven by Alfven eigenmodes (AEs) in DIII-D plasmas using realistic parameters and beam ion deposition profiles. The synthetic signal of a fast-ion loss detector (FILD) is calculated for a single AE mode. The first harmonic of the calculated FILD signal is linearly proportional to the AE amplitude with the same AE frequency in agreement with the experimental measurement. The calculated second harmonic is proportional to the square of the first harmonic for typical AE amplitudes. The coefficient of quadratic scaling is found to be sensitive to the AE mode width. The second part of this work considers the AE drive due to coherent prompt loss. As a result, it is shown that the loss-induced mode drive is much smaller than the previous estimate and can be ignored for mode stability.},
doi = {10.1063/1.5000073},
journal = {Physics of Plasmas},
number = 8,
volume = 24,
place = {United States},
year = {Wed Aug 30 00:00:00 EDT 2017},
month = {Wed Aug 30 00:00:00 EDT 2017}
}

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