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Title: First experimental measurements of a new fast ion driven micro-burst instability in a field-reversed configuration plasma

Abstract

In modern field-reversed configuration (FRC) experiments at TAE Technologies, classical FRC instabilities are suppressed by advanced neutral beam injection and edge biasing methods, leading to high plasma confinement and fast ion pressure built-up which is comparable to the bulk plasma pressure. In some of these high performance FRC plasmas, a new macroscopically non-destructive fast ion driven micro-burst instability is observed as periodic small amplitude bursts with frequency down chirping in the diamagnetic drift frequency range, repeating about every 0.1 to 0.5 ms. The occurrence of these micro-bursts and burst-free operation can be controlled by changing the injected neutral beam energy. Furthermore, major observed characteristics of this new instability are presented. Possible explanation of the phenomenon is suggested.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1] more »;  [1];  [1];  [1];  [3] « less
  1. TAE Technologies, Inc., Rancho Santa Margarita, CA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Univ. of Texas at Austin, Austin, TX (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
[The TAE Team]
OSTI Identifier:
1484350
Grant/Contract Number:  
[AC02-09CH11466]
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
[ Journal Volume: 58; Journal Issue: 12]; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; field-reversed configuration; micro-burst instability; fast ion

Citation Formats

Deng, B. H., Douglass, J. D., Roche, T., Belova, E. V., Beall, M., Binderbauer, M. W., Clary, R., Dettrick, S. A., Gota, H., Granstedt, E., Korepanov, S., Magee, R. M., Necas, A., Onofri, M., Putvinski, S., Smirnov, A., Song, Y., Tajima, T., Thompson, M. C., Tuszewski, M., Van Drie, A. D., Yang, X., Zhai, K., and Horton, W. First experimental measurements of a new fast ion driven micro-burst instability in a field-reversed configuration plasma. United States: N. p., 2018. Web. doi:10.1088/1741-4326/aae5df.
Deng, B. H., Douglass, J. D., Roche, T., Belova, E. V., Beall, M., Binderbauer, M. W., Clary, R., Dettrick, S. A., Gota, H., Granstedt, E., Korepanov, S., Magee, R. M., Necas, A., Onofri, M., Putvinski, S., Smirnov, A., Song, Y., Tajima, T., Thompson, M. C., Tuszewski, M., Van Drie, A. D., Yang, X., Zhai, K., & Horton, W. First experimental measurements of a new fast ion driven micro-burst instability in a field-reversed configuration plasma. United States. doi:10.1088/1741-4326/aae5df.
Deng, B. H., Douglass, J. D., Roche, T., Belova, E. V., Beall, M., Binderbauer, M. W., Clary, R., Dettrick, S. A., Gota, H., Granstedt, E., Korepanov, S., Magee, R. M., Necas, A., Onofri, M., Putvinski, S., Smirnov, A., Song, Y., Tajima, T., Thompson, M. C., Tuszewski, M., Van Drie, A. D., Yang, X., Zhai, K., and Horton, W. Mon . "First experimental measurements of a new fast ion driven micro-burst instability in a field-reversed configuration plasma". United States. doi:10.1088/1741-4326/aae5df. https://www.osti.gov/servlets/purl/1484350.
@article{osti_1484350,
title = {First experimental measurements of a new fast ion driven micro-burst instability in a field-reversed configuration plasma},
author = {Deng, B. H. and Douglass, J. D. and Roche, T. and Belova, E. V. and Beall, M. and Binderbauer, M. W. and Clary, R. and Dettrick, S. A. and Gota, H. and Granstedt, E. and Korepanov, S. and Magee, R. M. and Necas, A. and Onofri, M. and Putvinski, S. and Smirnov, A. and Song, Y. and Tajima, T. and Thompson, M. C. and Tuszewski, M. and Van Drie, A. D. and Yang, X. and Zhai, K. and Horton, W.},
abstractNote = {In modern field-reversed configuration (FRC) experiments at TAE Technologies, classical FRC instabilities are suppressed by advanced neutral beam injection and edge biasing methods, leading to high plasma confinement and fast ion pressure built-up which is comparable to the bulk plasma pressure. In some of these high performance FRC plasmas, a new macroscopically non-destructive fast ion driven micro-burst instability is observed as periodic small amplitude bursts with frequency down chirping in the diamagnetic drift frequency range, repeating about every 0.1 to 0.5 ms. The occurrence of these micro-bursts and burst-free operation can be controlled by changing the injected neutral beam energy. Furthermore, major observed characteristics of this new instability are presented. Possible explanation of the phenomenon is suggested.},
doi = {10.1088/1741-4326/aae5df},
journal = {Nuclear Fusion},
number = [12],
volume = [58],
place = {United States},
year = {2018},
month = {10}
}

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Figures / Tables:

Fig. 1 Fig. 1: In some high performance FRC plasma discharges in C-2U the excluded flux radius (a) shows step drops, correlated with periodic micro-bursts in the FIR interferometer data (b).

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