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Title: Experimental Verification of the Kruskal-Shafranov Stability Limit in Line-Tied Partial Toroidal Plasmas

Abstract

The stability properties of partial toroidal flux ropes are studied in detail in the laboratory, motivated by ubiquitous arched magnetic structures found on the solar surface. The flux ropes studied here are magnetized arc discharges formed between two electrodes in the Magnetic Reconnection Experiment (MRX) [Yamada et al., Phys. Plasmas, 4, 1936 (1997)]. The three dimensional evolution of these flux ropes is monitored by a fast visible light framing camera, while their magnetic structure is measured by a variety of internal magnetic probes. The flux ropes are consistently observed to undergo large-scale oscillations as a result of an external kink instability. Using detailed scans of the plasma current, the guide field strength, and the length of the flux rope, we show that the threshold for kink stability is governed by the Kruskal-Shafranov limit for a flux rope that is held fixed at both ends (i.e., qa = 1).

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1030419
Report Number(s):
PPPL-4642
TRN: US1200431
DOE Contract Number:  
DE-ACO2-09CH11466
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRIC CURRENTS; ELECTRODES; KINK INSTABILITY; MAGNETIC PROBES; MAGNETIC RECONNECTION; OSCILLATIONS; STABILITY; VERIFICATION; Gas Discharges, Kink Instability, MHD Instability

Citation Formats

Oz, E., Myers, C. E., Yamada, M., Ji, H., Kulsrud, R. M., and Xie, J. Experimental Verification of the Kruskal-Shafranov Stability Limit in Line-Tied Partial Toroidal Plasmas. United States: N. p., 2011. Web. doi:10.2172/1030419.
Oz, E., Myers, C. E., Yamada, M., Ji, H., Kulsrud, R. M., & Xie, J. Experimental Verification of the Kruskal-Shafranov Stability Limit in Line-Tied Partial Toroidal Plasmas. United States. doi:10.2172/1030419.
Oz, E., Myers, C. E., Yamada, M., Ji, H., Kulsrud, R. M., and Xie, J. Tue . "Experimental Verification of the Kruskal-Shafranov Stability Limit in Line-Tied Partial Toroidal Plasmas". United States. doi:10.2172/1030419. https://www.osti.gov/servlets/purl/1030419.
@article{osti_1030419,
title = {Experimental Verification of the Kruskal-Shafranov Stability Limit in Line-Tied Partial Toroidal Plasmas},
author = {Oz, E. and Myers, C. E. and Yamada, M. and Ji, H. and Kulsrud, R. M. and Xie, J.},
abstractNote = {The stability properties of partial toroidal flux ropes are studied in detail in the laboratory, motivated by ubiquitous arched magnetic structures found on the solar surface. The flux ropes studied here are magnetized arc discharges formed between two electrodes in the Magnetic Reconnection Experiment (MRX) [Yamada et al., Phys. Plasmas, 4, 1936 (1997)]. The three dimensional evolution of these flux ropes is monitored by a fast visible light framing camera, while their magnetic structure is measured by a variety of internal magnetic probes. The flux ropes are consistently observed to undergo large-scale oscillations as a result of an external kink instability. Using detailed scans of the plasma current, the guide field strength, and the length of the flux rope, we show that the threshold for kink stability is governed by the Kruskal-Shafranov limit for a flux rope that is held fixed at both ends (i.e., qa = 1).},
doi = {10.2172/1030419},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {7}
}