Global Alfvén eigenmode scaling and suppression: experiment and theory
Abstract
The spherical tokamak NSTX has been upgraded to include a second neutral beam line, with three independent beam sources, and to be capable of higher toroidal fields and longer duration plasmas [Ono, et al., Nucl. Fusion 55 (2015) 073007]. In this paper we describe some of the initial observations of the affect that the higher field and the modified fast-ion distributions have had on the nature of the global Alfvén eigenmodes (GAE). We also report that the GAE excited through a Doppler-shifted ion cyclotron resonance (DCR) were suppressed in a large number of shots with the injection of a small amount of high pitch (V||/V) fast ions, consistent with the predictions of an analytic theory [Gorelenkov, et al., Nucl. Fusion 43 (2003) 228]. We show that the experimental scaling of the GAE frequency and toroidal mode numbers with toroidal field is qualitatively consistent with the predictions of the analytic theory, providing validation for the DCR model. The observed suppression of GAE has also been reproduced in simulations with the hybrid ideal stability code HYM [Belova, et al., Phys. Plasmas 24 (2017), 042505].
- Authors:
-
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Univ. of California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- the NSTX-U team
- OSTI Identifier:
- 1463512
- Grant/Contract Number:
- AC02-09CH11466; DESC-SC0011810
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 8; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Fredrickson, E. D., Belova, E. V., Gorelenkov, N. N., Podesta, M., Bell, R. E., Crocker, N. A., Diallo, A., and LeBlanc, B. P. Global Alfvén eigenmode scaling and suppression: experiment and theory. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aac64c.
Fredrickson, E. D., Belova, E. V., Gorelenkov, N. N., Podesta, M., Bell, R. E., Crocker, N. A., Diallo, A., & LeBlanc, B. P. Global Alfvén eigenmode scaling and suppression: experiment and theory. United States. https://doi.org/10.1088/1741-4326/aac64c
Fredrickson, E. D., Belova, E. V., Gorelenkov, N. N., Podesta, M., Bell, R. E., Crocker, N. A., Diallo, A., and LeBlanc, B. P. Mon .
"Global Alfvén eigenmode scaling and suppression: experiment and theory". United States. https://doi.org/10.1088/1741-4326/aac64c. https://www.osti.gov/servlets/purl/1463512.
@article{osti_1463512,
title = {Global Alfvén eigenmode scaling and suppression: experiment and theory},
author = {Fredrickson, E. D. and Belova, E. V. and Gorelenkov, N. N. and Podesta, M. and Bell, R. E. and Crocker, N. A. and Diallo, A. and LeBlanc, B. P.},
abstractNote = {The spherical tokamak NSTX has been upgraded to include a second neutral beam line, with three independent beam sources, and to be capable of higher toroidal fields and longer duration plasmas [Ono, et al., Nucl. Fusion 55 (2015) 073007]. In this paper we describe some of the initial observations of the affect that the higher field and the modified fast-ion distributions have had on the nature of the global Alfvén eigenmodes (GAE). We also report that the GAE excited through a Doppler-shifted ion cyclotron resonance (DCR) were suppressed in a large number of shots with the injection of a small amount of high pitch (V||/V) fast ions, consistent with the predictions of an analytic theory [Gorelenkov, et al., Nucl. Fusion 43 (2003) 228]. We show that the experimental scaling of the GAE frequency and toroidal mode numbers with toroidal field is qualitatively consistent with the predictions of the analytic theory, providing validation for the DCR model. The observed suppression of GAE has also been reproduced in simulations with the hybrid ideal stability code HYM [Belova, et al., Phys. Plasmas 24 (2017), 042505].},
doi = {10.1088/1741-4326/aac64c},
journal = {Nuclear Fusion},
number = 8,
volume = 58,
place = {United States},
year = {Mon May 21 00:00:00 EDT 2018},
month = {Mon May 21 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Works referencing / citing this record:
Analytic stability boundaries for compressional and global Alfvén eigenmodes driven by fast ions. I. Interaction via ordinary and anomalous cyclotron resonances
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Numerical simulations of global Alfvén eigenmodes excitation and stabilization in NSTX-U
journal, September 2019
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Figures / Tables found in this record: