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Title: Stable compression of a spherical tokamak plasma

Abstract

In this study, an analysis of toroidal plasma compression by a collapsing flux conserver reveals linearly stable scenarios of operation to high compression ratios. The resistive and ideal MHD stability is calculated in full toroidal geometry using the asymptotic matching method in realistic conditions. A time dependent MHD simulation of the compression is conducted to confirm the conservation principles used to calculate the equilibrium states for the analysis. The near edge current profile, controlled by toroidal field ramping during compression, is shown to be critical to stability due to coupling between poloidal components of the least stable mode. Two cases with slight differences in edge current are examined, one with a stable corridor to high compression and one without.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2];  [2]; ORCiD logo [1];  [2];  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. General Fusion Inc., Burnaby, BC (Canada)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1650654
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 4; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Brennan, Dylan, Froese, Aaron, Reynolds, Meritt, Barsky, Sandra, Wang, Zhirui, Delage, Michael, and Laberge, Michel. Stable compression of a spherical tokamak plasma. United States: N. p., 2020. Web. https://doi.org/10.1088/1741-4326/ab74a2.
Brennan, Dylan, Froese, Aaron, Reynolds, Meritt, Barsky, Sandra, Wang, Zhirui, Delage, Michael, & Laberge, Michel. Stable compression of a spherical tokamak plasma. United States. https://doi.org/10.1088/1741-4326/ab74a2
Brennan, Dylan, Froese, Aaron, Reynolds, Meritt, Barsky, Sandra, Wang, Zhirui, Delage, Michael, and Laberge, Michel. Thu . "Stable compression of a spherical tokamak plasma". United States. https://doi.org/10.1088/1741-4326/ab74a2. https://www.osti.gov/servlets/purl/1650654.
@article{osti_1650654,
title = {Stable compression of a spherical tokamak plasma},
author = {Brennan, Dylan and Froese, Aaron and Reynolds, Meritt and Barsky, Sandra and Wang, Zhirui and Delage, Michael and Laberge, Michel},
abstractNote = {In this study, an analysis of toroidal plasma compression by a collapsing flux conserver reveals linearly stable scenarios of operation to high compression ratios. The resistive and ideal MHD stability is calculated in full toroidal geometry using the asymptotic matching method in realistic conditions. A time dependent MHD simulation of the compression is conducted to confirm the conservation principles used to calculate the equilibrium states for the analysis. The near edge current profile, controlled by toroidal field ramping during compression, is shown to be critical to stability due to coupling between poloidal components of the least stable mode. Two cases with slight differences in edge current are examined, one with a stable corridor to high compression and one without.},
doi = {10.1088/1741-4326/ab74a2},
journal = {Nuclear Fusion},
number = 4,
volume = 60,
place = {United States},
year = {2020},
month = {3}
}

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