Reduction of Thermal Wall Load by Gas Puffing in Reversed-Field Pinch Device, TPE-RX
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概要
- 論文の詳細を見る
We report that the thermal wall load due to locked modes can be decreased by means of gas puffing in the reversed-field pinch (RFP) device, TPE-RX [Y. Yagi et al.: Fus. Eng. Design 45 (1999) 409]. Under standard RFP operation in TPE-RX, the phase- and wall-locked modes, i.e., spatially localized and stationary magnetic perturbations, respectively, appear after the current-rising phase. The locked modes cause a severe thermal wall load of the order of 100 MW/m2 on the first wall. It is estimated that the temperature on the plasma-facing wall at the mode-locking position sometimes exceeds the melting temperature of stainless steel. The thermal wall load increases with plasma current, $I_{\text{p}}$. We have succeeded in mitigating the high thermal wall load by gas puffing during discharges. It is shown that the maximum temperature increment of the vacuum vessel wall is halved when a gas-puffing rate of 200 Pa m3/s is applied at $I_{\text{p}}=350$ kA. The characteristics of the temperature increase of the vacuum vessel are presented, and they indicate the nature of the locked mode in RFP discharges in TPE-RX.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-12-15
著者
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YAGI Yasuyuki
National Institute of Advanced Industrial Science and Technology (AIST)
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KOGUCHI Haruhisa
National Institute of Advanced Industrial Science and Technology (AIST)
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SHIMADA Toshio
National Institute of Advanced Industrial Science and Technology (AIST)
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HIRANO Yoichi
National Institute of Advanced Industrial Science and Technology (AIST)
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Sakakita Hajime
National Institute Of Advanced Industrial Science And Technology
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Shimada Toshio
National Institute of Advanced Industrial Science and Technology (AIST), Central 2 bld., 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Yagi Yasuyuki
National Institute of Advanced Industrial Science and Technology (AIST), Central 2 bld., 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Sakakita Hajime
National Institute of Advanced Industrial Science and Technology (AIST), Central 2 bld., 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Koguchi Haruhisa
National Institute of Advanced Industrial Science and Technology (AIST), Central 2 bld., 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Hirano Yoichi
National Institute of Advanced Industrial Science and Technology (AIST), Central 2 bld., 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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