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The magnitude of sawtooth crash events in multiple and quasi-single helicity states in a reversed-field-pinch plasma
Advanved insittute of Industrial Science and Technology (JAPAN). (Fusion Plasma Physics)ORCID iD: 0000-0002-9546-4494
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2005 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 12, no 8, 082507- p.Article in journal (Refereed) Published
Abstract [en]

Factors affecting the magnitude of sawtooth crashes in soft x-ray (SXR) signals (I-SXR) have been studied using data from high-Theta (pinch parameter) discharges in the toroidal pinch experiment TPE-1RM20 reversed-field pinch device [Y. Yagi , J. Plasma Fusion Research 69, 700 (1993)]. In TPE-1RM20, discharges with a high Theta that are free of large sawteeth (improved high-Theta mode discharges), spontaneously appeared [Y. Hirano , Nucl. Fusion 36, 721 (1996)] among typical conventional discharges exhibiting large sawtooth crashes. The reason for the spontaneous appearance of sawtooth-free discharges has been unclear. It is shown that the normalized magnitude of the SXR crashes, [Delta(I-SXR)/I-SXR], is well correlated with the m (poloidal mode number)=0 mode amplitude in the postcrash phase. It is also shown that Delta(I-SXR)/I-SXR is smaller when the quasi-single helicity state precedes the crash rather than when the multiple-helicity state precedes the crash, and Delta(I-SXR)/I-SXR is smaller when E-parallel to (the parallel electric field at the plasma surface) is approximately zero in the precrash phase rather than E-parallel to being negative.

Place, publisher, year, edition, pages
2005. Vol. 12, no 8, 082507- p.
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-71784DOI: 10.1063/1.2000887ISI: 000231310800032OAI: diva2:487001
QC 20120131Available from: 2012-01-31 Created: 2012-01-31 Last updated: 2012-01-31Bibliographically approved

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Frassinetti, Lorenzo
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