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22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone

Dependence of RMP penetration threshold on plasma parameters and ion species in helical plasmas

24 Oct 2018, 08:30
Mahatma Mandir Conference Centre

Mahatma Mandir Conference Centre

Gandhinagar (nearest Airport: Ahmedabad), India
Poster P3 Posters


Dr Kiyomasa WATANABE (National Institute for Fusion Science)


We investigate the penetration threshold of the RMP (Resonant Magnetic Perturbation) by the external coils in the LHD (Large Helical Device) for the various configurations. In a configuration of the LHD, it has qualitative similar dependence with that in Ohmic tokamak plasmas. However, the qualitative dependence on the collisionality is opposite to that in a high plasma aspect configuration, which is a quite unique property, and first found in the LHD. Also, we investigate the threshold on the ion species, and find that the threshold of deuterium is quite smaller than that of hydrogen. In the above cases, the RMP penetration thresholds are higher as the poloidal rotation is faster, which is qualitatively consistent with the torque balance model between the electro-magnetic and the poloidal neoclassical viscous torque.
Country or International Organization Japan
Paper Number EX/P3-15

Primary author

Dr Kiyomasa WATANABE (National Institute for Fusion Science)


Prof. Satoru Sakakibara (National Institute for Fusion Science) Dr Satoshi Ohdachi (National Institute for Fusion Science) Dr Yasuhiro Suzuki (National Institute for Fusion Science) Dr Yoshiro NARUSHIMA (National Institute for Fusion Science) Dr Yuki Takemura (National Institute for Fusion Science)

Presentation Materials