Recent Progress in Plasma Control Studies on the Improvement of Plasma Performance in Heliotron J

Tohru MIZUUCHI; Kazunobu NAGASAKI; Hiroyuki OKADA; Shinji KOBAYASHI; Satoshi YAMAMOTO; Takashi MINAMI; Shinsuke OHSHIMA; Masaki TAKEUCHI; Kiyofumi MUKAI; Hyunyong LEE; Linge ZANG; Kohta NOMURA; et al.

Plasma Science and Technology > 2011 > 13(1): 21-25.

Tohru MIZUUCHI, Kazunobu NAGASAKI, Hiroyuki OKADA, Shinji KOBAYASHI, Satoshi YAMAMOTO, Takashi MINAMI, Shinsuke OHSHIMA, Masaki TAKEUCHI, Kiyofumi MUKAI, Hyunyong LEE, Linge ZANG, Kohta NOMURA, et al.. Recent Progress in Plasma Control Studies on the Improvement of Plasma Performance in Heliotron J[J]. Plasma Science and Technology, 2011, 13(1): 21-25.

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Recent Progress in Plasma Control Studies on the Improvement of Plasma Performance in Heliotron J

1Institute of Advanced Energy, Kyoto Univ., Gokasho, Uji, 611-0011 Japan. 2Kyoto Univ. Pioneering Research Unit for Next Generation, Gokasho, Uji, Japan. 3Graduate School of Energy Science, Kyoto Univ., Gokasho, Uji, Japan. 4Graduate School of Engineering, Hiroshima Univ., Higashi-Hiroshima, Japan. 5Plasma Research Center, Univ. of Tsukuba, Tsukuba, Japan.

Funds: supported by the JSPS-CAS Core University Program in the field of “Plasma and Nuclear Fusion”, the Collaboration Program of the Laboratory for Complex Energy Processes, IAE, Kyoto University, the NIFS Collaborative Research Program (NIFS10KUHL030, etc.) and the NIFS/NINS project of Formation of International Network for Scientific Collaborations, as well as the Grant-in-Aid for Sci. Research, MEXT.

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Abstract

Abstract

Recent progress in plasma control studies on the improvement of plasma performance in Heliotron J is reviewed. The supersonic molecular beam injection (SMBI) fueling is successfully applied to Heliotron J plasma. A supersonic H2-beam is effectively injected to increase fueling efficiency and generate a peaked density profile. Local fueling with a short-pulsed SMBI can increase the core plasma density and avoid the degradation arising from edge cooling. Second harmonic electron cyclotron current drive (ECCD) experiments were conducted by launching a focused Gaussian beam with -0.05 ? N|| ? 0.6. Results show that the EC driven current is determined not only by N|| but also by local magnetic field structure where the EC power is deposited. Detailed analysis of the observed N|| and B dependences is in progress with a ray-tracing simulation using the TRAVIS code. Fast ion velocity distribution was investigated using fast protons generated by ion cyclotron resonant frequency (ICRF) minority heating. For the standard configuration in Heliotron J, charge exchange neutral particle analysis (CX-NPA) measurements show higher effective temperature of fast minority protons in the on-axis resonance case compared to that in the HFS (high field side) off-axis resonance case. However, the increase in bulk ion temperature in the HFS resonance case is larger than that in the on-axis resonance.
- plasma control,
- Heliotron J,
- improved confinement,
- ECRH/ECCD,
- NBI,
- ICRF,
- minority heating,
- fueling control

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