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Title: Observation of a pressure limit in a gun-driven spheromak

Abstract

Density in a spheromak is lowered by action of a m/n=2/4 island, after which the electrons heat rapidly to give profiles of nT{sub before}=nT{sub after}, indicating that the spheromak heats up to a pressure limit. The spheromak core remains at T{sub e}{approx}150 eV for {approx}1/2 ms during a period exhibiting low amplitude incoherent fluctuations consistent with a pressure-driven mode, giving the volume-averaged electron beta <{beta}{sub e}>{approx}3% and peak {beta}{sub e} of {approx}6%. Calculations show that measured pressure profiles are close to the Mercier limit.

Authors:
; ; ; ; ; ; ; ; ;  [1]
  1. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
20782771
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 13; Journal Issue: 4; Other Information: DOI: 10.1063/1.2188086; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; ELECTRONS; EV RANGE; FLUCTUATIONS; MAGNETIC ISLANDS; PLASMA; PLASMA CONFINEMENT; PLASMA DENSITY; PLASMA INSTABILITY; PLASMA PRESSURE; RADIATION TRANSPORT; SPHEROMAK DEVICES

Citation Formats

Woodruff, S., Hooper, E.B., Pearlstein, L.D., Bulmer, R., Hill, D.N., Holcomb, C.T., McLean, H.S., Moller, J., Stallard, B.W., and Wood, R.D. Observation of a pressure limit in a gun-driven spheromak. United States: N. p., 2006. Web. doi:10.1063/1.2188086.
Woodruff, S., Hooper, E.B., Pearlstein, L.D., Bulmer, R., Hill, D.N., Holcomb, C.T., McLean, H.S., Moller, J., Stallard, B.W., & Wood, R.D. Observation of a pressure limit in a gun-driven spheromak. United States. doi:10.1063/1.2188086.
Woodruff, S., Hooper, E.B., Pearlstein, L.D., Bulmer, R., Hill, D.N., Holcomb, C.T., McLean, H.S., Moller, J., Stallard, B.W., and Wood, R.D. Sat . "Observation of a pressure limit in a gun-driven spheromak". United States. doi:10.1063/1.2188086.
@article{osti_20782771,
title = {Observation of a pressure limit in a gun-driven spheromak},
author = {Woodruff, S. and Hooper, E.B. and Pearlstein, L.D. and Bulmer, R. and Hill, D.N. and Holcomb, C.T. and McLean, H.S. and Moller, J. and Stallard, B.W. and Wood, R.D.},
abstractNote = {Density in a spheromak is lowered by action of a m/n=2/4 island, after which the electrons heat rapidly to give profiles of nT{sub before}=nT{sub after}, indicating that the spheromak heats up to a pressure limit. The spheromak core remains at T{sub e}{approx}150 eV for {approx}1/2 ms during a period exhibiting low amplitude incoherent fluctuations consistent with a pressure-driven mode, giving the volume-averaged electron beta <{beta}{sub e}>{approx}3% and peak {beta}{sub e} of {approx}6%. Calculations show that measured pressure profiles are close to the Mercier limit.},
doi = {10.1063/1.2188086},
journal = {Physics of Plasmas},
number = 4,
volume = 13,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}