Magnetohydrodynamic computation of feedback stabilization of resistive-shell instabilities in the reversed field pinch
MHD computations demonstrate that feedback can sustain reversal and reduce loop voltage in resistive-shell reversed field pinch (RFP) plasmas. In the absence of a close-fitting conducting shell, feedback with conducting coils [approximately]2R/a tearing modes resonant near axis is found to restore plasma parameters to nearly their levels with a close-fitting conducting shell. When original dynamo modes are stabilized, neighboring tearing modes grow to maintain the RFP dynamo more efficiently. This suggests that experimentally observed limits on RFP pulselengths to the order of the shell time can be overcome by applying feedback to a few helical modes. Feedback with resistive coils yields information on requirements for more physically realistic feedback systems and on the potentiality of improvement of resistive-shell plasma parameters beyond the conducting-shell case. Plasma response to shell rotation is investigated, and issues relevant to mode locking and feedback rotation of individual modes are discussed.
- Research Organization:
- Wisconsin Univ., Madison, WI (United States). Plasma Physics Research
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-85ER53212
- OSTI ID:
- 6565658
- Report Number(s):
- DOE/ER/53212-212; ON: DE93013466
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Magnetohydrodynamic computation of feedback stabilization of resistive-shell instabilities in the reversed field pinch
MHD computation of feedback of resistive-shell instabilities in the reversed field pinch