Analysis of the Ballooning Modes in High-[beta] ST with Magnetic Fluctuation Measurement

Analysis of the Ballooning Modes in High-[beta] ST with Magnetic Fluctuation Measurement

The Ballooning mode, which occurs at a region where the plasma pressure gradient exceeds a certain limit, needs to be suppressed to achieve high β. Using a magnetic-probe system with a high spatial resolution, we measured magnetic fluctuations in a very local area to get fluctuations due to the Ball...

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Veröffentlicht in:Denki Gakkai ronbunshi. A, Kiso zairyÅ Kiso zairyÅ, 2003-11, Vol.123 (11), p.1143
Hauptverfasser: Umeda, Kotaro, Ono, Yasushi
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Ono, Yasushi
description The Ballooning mode, which occurs at a region where the plasma pressure gradient exceeds a certain limit, needs to be suppressed to achieve high β. Using a magnetic-probe system with a high spatial resolution, we measured magnetic fluctuations in a very local area to get fluctuations due to the Ballooning mode. As its result, we found that the amount of fluctuation decreased with Itfc while Itfc < 40 kA, but that it increased while Itfc > 40 kA, which agreed with the earlier simulation of the ballooning mode. Analyzing the fluctuation of Itfc > 40 kA, we found that the frequency was 0.4 - 0.8 MHz and the mode number was about 10.
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title Analysis of the Ballooning Modes in High-[beta] ST with Magnetic Fluctuation Measurement
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