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Effects of low particle fuelling and electron heating on the internal transport barrier in ICRF heated reversed magnetic shear plasmas of JT-60U

M Iwase, Y Koide, K Tobita, S Moriyama, H Takenaga, T Fujita, H Shirai, Y Kusama, G J Kramer, H Kimura1999年Plasma Physics and Controlled FusionIF 2.2出版社

Plasmas with an internal transport barrier (ITB) were heated with a second-harmonic ion cyclotron range of frequency (ICRF) minority heating during the reversed magnetic shear (RS) experiments in JT-60U. In order to control the central particle fuelling, the input power of the neutral beam injection (NBI) heating during ICRF heating was scanned shot-by-shot. The electron temperature gradient around the ITB increased with the total input power. Steeper gradients were obtained with additional ICRF heating by avoiding collapses induced by the steep pressure gradient. The difference of the time derivative at the ICRF injection timing indicated a fast ion loss of about 40% during the RS operation. The density gradient was increased with the central fuelling by the NBI heating and the shoulder position of the slope at the ITB moved outward with the particle fuelling. The particle confinement time at the ITB increased with the central particle fuelling while the particle confinement time of the low-fuelling discharges were similar to that of the normal shear L-mode discharge.

日本語訳

内部輸送障壁(ITB)を有するプラズマに対し、JT-60Uにおける反転磁気シア(RS)実験中に、第二高調波イオンサイクロトロン周波数帯(ICRF)マイノリティ加熱を適用した。ICRF加熱中の中心粒子供給を制御するため、中性粒子ビーム入射(NBI)加熱の投入電力をショットごとに走査した。ITB周辺の電子温度勾配は全投入電力とともに増大した。より急峻な勾配は、急峻な圧力勾配によって誘起される崩壊を回避する追加のICRF加熱によって得られた。ICRF投入時点での時間微分の差は、RS運転中に高速イオン損失が約40%生じたことを示した。密度勾配はNBI加熱による中心粒子供給とともに増大し、ITBにおけるショルダー位置は粒子供給とともに外側へ移動した。ITBにおける粒子閉じ込め時間は中心粒子供給とともに増大した一方、低供給放電における粒子閉じ込め時間は通常シアのLモード放電と同程度であった。

wiki

Ion cyclotron heatingJT-60UTransport barrierInternal transport barrierMagnetic shearReversed magnetic shearFuellingElectron heating
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