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Title: Observations of Improved Stability and Confinement in a High-{beta} Self-Organized Spherical-Torus-Like Field-Reversed Configuration

Abstract

An extremely high-{beta} (over 85%) self-organized field-reversed configuration (FRC) with a spherical-torus- (ST-)like core is produced in the translation, confinement, and sustainment experiment by highly super-Alfvenic translation of a spheromaklike plasmoid. Substantial flux conversion from toroidal into poloidal occurs during the capture process, resulting in the ST-like core. This plasma state exhibits a remarkable stabilizing property for the ubiquitous n=2 centrifugally driven interchange modes present in {theta}-pinch formed FRCs. This is explained, for the first time, by a simple model taking into account magnetic shear and centrifugal effects. The FRC-ST configuration has up to 4 times improvement in flux confinement times over the scaling of conventional {theta}-pinch formed FRCs and, thus, a significant improvement in the resistivity and transport.

Authors:
; ; ;  [1]
  1. Redmond Plasma Physics Laboratory, University of Washington, Seattle, Washington 98195 (United States)
Publication Date:
OSTI Identifier:
20699474
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 95; Journal Issue: 17; Other Information: DOI: 10.1103/PhysRevLett.95.175001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPTURE; CHARGED-PARTICLE TRANSPORT; FIELD-REVERSED THETA PINCH DEVICES; PLASMA; PLASMA CONFINEMENT; PLASMA INSTABILITY; REVERSE-FIELD PINCH; SPHERICAL CONFIGURATION; STABILITY

Citation Formats

Guo, H.Y., Hoffman, A.L., Steinhauer, L.C., and Miller, K.E. Observations of Improved Stability and Confinement in a High-{beta} Self-Organized Spherical-Torus-Like Field-Reversed Configuration. United States: N. p., 2005. Web. doi:10.1103/PhysRevLett.95.175001.
Guo, H.Y., Hoffman, A.L., Steinhauer, L.C., & Miller, K.E. Observations of Improved Stability and Confinement in a High-{beta} Self-Organized Spherical-Torus-Like Field-Reversed Configuration. United States. doi:10.1103/PhysRevLett.95.175001.
Guo, H.Y., Hoffman, A.L., Steinhauer, L.C., and Miller, K.E. Fri . "Observations of Improved Stability and Confinement in a High-{beta} Self-Organized Spherical-Torus-Like Field-Reversed Configuration". United States. doi:10.1103/PhysRevLett.95.175001.
@article{osti_20699474,
title = {Observations of Improved Stability and Confinement in a High-{beta} Self-Organized Spherical-Torus-Like Field-Reversed Configuration},
author = {Guo, H.Y. and Hoffman, A.L. and Steinhauer, L.C. and Miller, K.E.},
abstractNote = {An extremely high-{beta} (over 85%) self-organized field-reversed configuration (FRC) with a spherical-torus- (ST-)like core is produced in the translation, confinement, and sustainment experiment by highly super-Alfvenic translation of a spheromaklike plasmoid. Substantial flux conversion from toroidal into poloidal occurs during the capture process, resulting in the ST-like core. This plasma state exhibits a remarkable stabilizing property for the ubiquitous n=2 centrifugally driven interchange modes present in {theta}-pinch formed FRCs. This is explained, for the first time, by a simple model taking into account magnetic shear and centrifugal effects. The FRC-ST configuration has up to 4 times improvement in flux confinement times over the scaling of conventional {theta}-pinch formed FRCs and, thus, a significant improvement in the resistivity and transport.},
doi = {10.1103/PhysRevLett.95.175001},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 17,
volume = 95,
place = {United States},
year = {2005},
month = {10}
}