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Dynamic stabilization of disruption precursors in tokamak

Abstract

A method for dynamic stabilization of the disruption precursors in tokamak is proposed, that is a controlled ac current induced and added to the equilibrium current. The ac currents applied can be a sine alternative current with a relevant frequency, or a pulsed current with a suitable pulsed width {tau} and or a discontinuous pulsed current whose width {tau} is very shorter than the intervals between pulses, and or a `sawtooth` pulsed current with the time of ramp phase of the sawtooth is very much shorter than the sawtooth descending time, the ratio of them can be {<=}10{sup -3}. The physical model of the ac current drive is analyzed in detail. The suppression role of the ac current on the MHD perturbations was analyzed in theory and proved numerically. It is indicated that the ac current can make the discontinuous derivative, {Delta}`, more favorable for the tearing mode stabilities, and so, as long as the parameters of the applied ac currents are selected suitably, the MHD perturbations can be suppressed effectively, the perturbations will be in the zero-growing state, the profile of the plasma current and temperature remain in the initial states and not variate basically, the tokamak be in  More>>
Authors:
Maoquan, Wang; Jianshan, Mao; Yuan, Pan [1] 
  1. Academia Sinica, Hefei, AH (China). Inst. of Plasma Physics
Publication Date:
Dec 01, 1994
Product Type:
Technical Report
Report Number:
CNIC-00914; ASIPP-0045(12/1994)
Reference Number:
SCA: 700370; PA: AIX-27:003817; EDB-96:033496; NTS-96:009448; SN: 96001526757
Resource Relation:
Other Information: PBD: Dec 1994
Subject:
70 PLASMA PHYSICS AND FUSION; MHD EQUILIBRIUM; ALTERNATING CURRENT; TOKAMAK DEVICES; DISTURBANCES; MAGNETOHYDRODYNAMICS; TEARING INSTABILITY
OSTI ID:
169965
Research Organizations:
China Nuclear Information Centre, Beijing, BJ (China)
Country of Origin:
China
Language:
English
Other Identifying Numbers:
Other: ON: DE96609065; TRN: CN9501833003817
Availability:
INIS; OSTI as DE96609065
Submitting Site:
INIS
Size:
16 p.
Announcement Date:

Citation Formats

Maoquan, Wang, Jianshan, Mao, and Yuan, Pan. Dynamic stabilization of disruption precursors in tokamak. China: N. p., 1994. Web.
Maoquan, Wang, Jianshan, Mao, & Yuan, Pan. Dynamic stabilization of disruption precursors in tokamak. China.
Maoquan, Wang, Jianshan, Mao, and Yuan, Pan. 1994. "Dynamic stabilization of disruption precursors in tokamak." China.
@misc{etde_169965,
title = {Dynamic stabilization of disruption precursors in tokamak}
author = {Maoquan, Wang, Jianshan, Mao, and Yuan, Pan}
abstractNote = {A method for dynamic stabilization of the disruption precursors in tokamak is proposed, that is a controlled ac current induced and added to the equilibrium current. The ac currents applied can be a sine alternative current with a relevant frequency, or a pulsed current with a suitable pulsed width {tau} and or a discontinuous pulsed current whose width {tau} is very shorter than the intervals between pulses, and or a `sawtooth` pulsed current with the time of ramp phase of the sawtooth is very much shorter than the sawtooth descending time, the ratio of them can be {<=}10{sup -3}. The physical model of the ac current drive is analyzed in detail. The suppression role of the ac current on the MHD perturbations was analyzed in theory and proved numerically. It is indicated that the ac current can make the discontinuous derivative, {Delta}`, more favorable for the tearing mode stabilities, and so, as long as the parameters of the applied ac currents are selected suitably, the MHD perturbations can be suppressed effectively, the perturbations will be in the zero-growing state, the profile of the plasma current and temperature remain in the initial states and not variate basically, the tokamak be in the stabilized operation state. (8 figs.).}
place = {China}
year = {1994}
month = {Dec}
}