[Table of Contents]

Plasma and Fusion Research

Volume 8, 2402141 (2013)

Regular Articles


Effects of Resonant Magnetic Perturbation on Particle Transport in LHD
Kenji TANAKA, Marcin JAKUBOWSKI1), Andreas DINKLAGE1), Yasuhiro SUZUKI, Motoshi GOTO, Tomohiro MORISAKI, Satoru SAKAKIBARA, Yoshiro NARUSHIMA, Tsuyoshi AKIYAMA, Tokihiko TOKUZAWA, Kazuo KAWAHATA, Ryo YASUHARA, Ichihiro YAMADA, Suguru MASUZAKI, Mikirou YOSHINUMA, Katsumi IDA, Leonid VYACHESLAVOV2), Clive MICHAEL3), David MIKKELSEN4) and Todd EVANS5)
National Institute for Fusion Science, Toki 509-5292, Japan
1)
Max-Planck Institut für Plasmaphysik, Greifswald, Germany
2)
Budker Institute of Nuclear Physics, SB RAS, Novosibirsk, Russia
3)
Australian National University, Canberra, Australia
4)
Princeton Plasma Physics Laboratory, New Jersey, U.S.A.
5)
General Atomics, San Diego, California, U.S.A.
(Received 7 December 2012 / Accepted 12 July 2013 / Published 15 November 2013)

Abstract

In this study, the effects of resonant magnetic perturbation (RMP) on particle transport are investigated in Large Helical device (LHD). The magnetic configuration is selected to be the outwardly shifted configuration, for which the magnetic axis position (Rax) is 3.9 m. At Rax = 3.9 m, the main plasma is surrounded by a thick ergodic layer, with width of about 30% of the plasma minor radius. The perturbation mode m/n = 1/1, where m and n are poloidal and toroidal mode numbers, is applied. The resonant layer is around the last closed flux surface. With RMP, a region in which both the connection and Kolmogorov lengths are finite and the magnetic field is ergodic forms; this region extends inside the main plasma. In the low-collisionality regime, where νh* < 1 (νh* = 1 is the boundary between the 1/ν and plateau regimes in stellarator/helical neoclassical transport), there is no apparent difference in particle transport with and without RMP. However, in the high-collisionality regime (νh* > 1), a clear difference in particle transport is found. A clear difference in turbulence is also observed, suggesting that turbulence plays a significant role in particle transport in the high-collisionality regime both with and without RMP.


Keywords

LHD, resonant magnetic perturbation, particle transport, turbulence, phase contrast imaging

DOI: 10.1585/pfr.8.2402141


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This paper may be cited as follows:

Kenji TANAKA, Marcin JAKUBOWSKI, Andreas DINKLAGE, Yasuhiro SUZUKI, Motoshi GOTO, Tomohiro MORISAKI, Satoru SAKAKIBARA, Yoshiro NARUSHIMA, Tsuyoshi AKIYAMA, Tokihiko TOKUZAWA, Kazuo KAWAHATA, Ryo YASUHARA, Ichihiro YAMADA, Suguru MASUZAKI, Mikirou YOSHINUMA, Katsumi IDA, Leonid VYACHESLAVOV, Clive MICHAEL, David MIKKELSEN and Todd EVANS, Plasma Fusion Res. 8, 2402141 (2013).