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Title: Tearing and MHD Instability During Gun Injection into a Spheromak

Abstract

Linear stability analysis of a two-cylinder approximation to gun injection--one cylinder to represent the confined spheromak and another to represent the gun--is shown to yield equilibria in which tearing modes exist simultaneously at the magnetic axis and at the geometric (gun) axis, as might be required to sustain helicity injection. These equilibria are MHD stable at the two axes but may have localized MHD instability at an interior minimum in the q profile. The theory predicts two tearing thresholds with successively deeper q minima as the gun current is increased at constant bias flux.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15013537
Report Number(s):
UCRL-ID-139019
TRN: US0600822
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; HELICITY; INSTABILITY; ELECTRON GUNS; SPHEROMAK DEVICES; MAGNETOHYDRODYNAMICS

Citation Formats

Fowler, T K. Tearing and MHD Instability During Gun Injection into a Spheromak. United States: N. p., 2000. Web. doi:10.2172/15013537.
Fowler, T K. Tearing and MHD Instability During Gun Injection into a Spheromak. United States. doi:10.2172/15013537.
Fowler, T K. Thu . "Tearing and MHD Instability During Gun Injection into a Spheromak". United States. doi:10.2172/15013537. https://www.osti.gov/servlets/purl/15013537.
@article{osti_15013537,
title = {Tearing and MHD Instability During Gun Injection into a Spheromak},
author = {Fowler, T K},
abstractNote = {Linear stability analysis of a two-cylinder approximation to gun injection--one cylinder to represent the confined spheromak and another to represent the gun--is shown to yield equilibria in which tearing modes exist simultaneously at the magnetic axis and at the geometric (gun) axis, as might be required to sustain helicity injection. These equilibria are MHD stable at the two axes but may have localized MHD instability at an interior minimum in the q profile. The theory predicts two tearing thresholds with successively deeper q minima as the gun current is increased at constant bias flux.},
doi = {10.2172/15013537},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Technical Report:

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