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Title: Recent developments in linear theta-pinch and laser-heated solenoid research

Abstract

At LASL, the experimental results from the high energy (T/sub e/ + T/sub i/ = 3.3 keV, n/sub e/ = 1.5 x 10/sup 16/ cm/sup -3/) 5-m Scylla IV-P theta pinch support the following: (1) single mode m = 1 ''wobble'' instability rotation frequencies of approximately 180 kHz are associated with axial wavelengths of 400 to 800 cm; (2) ion thermal conduction is an unimportant loss mechanism; (3) evidence of rarefaction-like waves is seen; (4) the normalized end-loss time is independent of the plasma beta and collisionality regime; (5) plasma flow from the ends remains collimated and convects magnetic fields; (6) LiD end plugs produce a three-fold increase in energy containment time over the open-ended configuration. Theoretical work at LASL has demonstrated the following: (1) an explanation of the m = 1 ''wobble'' instability has been formulated; (2) a correct description of end-loss must include the magnetic curvature term in the axial momentum equation. Mirrors increase the lifetime of a collisional plasma less than guiding center theory predicts; (3) magnetic field gradient drift can reduce the growth rate of the universal drift instability; (4) collisionless magnetoacoustic heating can be an effective heating mechanism in theta pinches. At MSNW-UW, CO/sub 2/more » laser heating of low energy (T/sub e/ approximately equal to T/sub i/ approximately equal to 2 eV, n/sub e/ approximately equal to 2 x 10/sup 17/ cm/sup -3/) plasmas is accomplished over a one-meter column length. Maintenance of an on-axis density minimum is demonstrated.« less

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Mathematical Sciences Northwest, Inc., Bellevue, WA (USA); Univ. of Washington, Seattle, WA (United States)
OSTI Identifier:
6577232
Report Number(s):
LA-UR-78-1910; CONF-780811-9
TRN: 79-001638
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 7. conference on plasma physics and control, Innsbruck, Austria, 23 Aug 1978
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; LINEAR THETA PINCH DEVICES; PLASMA CONFINEMENT; PLASMA MACROINSTABILITIES; SOLENOIDS; LASER-RADIATION HEATING; DRIFT INSTABILITY; INSTABILITY GROWTH RATES; MAGNETOACOUSTIC WAVES; PLASMA HEATING; SCYLLA DEVICES; CONFINEMENT; ELECTRIC COILS; ELECTRICAL EQUIPMENT; EQUIPMENT; HEATING; HYDROMAGNETIC WAVES; INSTABILITY; LINEAR PINCH DEVICES; OPEN PLASMA DEVICES; PINCH DEVICES; PLASMA INSTABILITY; PLASMA MICROINSTABILITIES; THERMONUCLEAR DEVICES; 700101* - Fusion Energy- Plasma Research- Confinement, Heating, & Production; 700107 - Fusion Energy- Plasma Research- Instabilities

Citation Formats

McKenna, K F, Bartsch, R R, and Commisso, R J. Recent developments in linear theta-pinch and laser-heated solenoid research. United States: N. p., 1978. Web.
McKenna, K F, Bartsch, R R, & Commisso, R J. Recent developments in linear theta-pinch and laser-heated solenoid research. United States.
McKenna, K F, Bartsch, R R, and Commisso, R J. Sun . "Recent developments in linear theta-pinch and laser-heated solenoid research". United States. https://www.osti.gov/servlets/purl/6577232.
@article{osti_6577232,
title = {Recent developments in linear theta-pinch and laser-heated solenoid research},
author = {McKenna, K F and Bartsch, R R and Commisso, R J},
abstractNote = {At LASL, the experimental results from the high energy (T/sub e/ + T/sub i/ = 3.3 keV, n/sub e/ = 1.5 x 10/sup 16/ cm/sup -3/) 5-m Scylla IV-P theta pinch support the following: (1) single mode m = 1 ''wobble'' instability rotation frequencies of approximately 180 kHz are associated with axial wavelengths of 400 to 800 cm; (2) ion thermal conduction is an unimportant loss mechanism; (3) evidence of rarefaction-like waves is seen; (4) the normalized end-loss time is independent of the plasma beta and collisionality regime; (5) plasma flow from the ends remains collimated and convects magnetic fields; (6) LiD end plugs produce a three-fold increase in energy containment time over the open-ended configuration. Theoretical work at LASL has demonstrated the following: (1) an explanation of the m = 1 ''wobble'' instability has been formulated; (2) a correct description of end-loss must include the magnetic curvature term in the axial momentum equation. Mirrors increase the lifetime of a collisional plasma less than guiding center theory predicts; (3) magnetic field gradient drift can reduce the growth rate of the universal drift instability; (4) collisionless magnetoacoustic heating can be an effective heating mechanism in theta pinches. At MSNW-UW, CO/sub 2/ laser heating of low energy (T/sub e/ approximately equal to T/sub i/ approximately equal to 2 eV, n/sub e/ approximately equal to 2 x 10/sup 17/ cm/sup -3/) plasmas is accomplished over a one-meter column length. Maintenance of an on-axis density minimum is demonstrated.},
doi = {},
url = {https://www.osti.gov/biblio/6577232}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {1}
}

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