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          Institute: MPI für Plasmaphysik     Collection: Conference Papers     Display Documents

ID: 60418.0, MPI für Plasmaphysik / Conference Papers
MHD instabilities and their effects on plasma confinement in the large helical device plasmas
Authors:Toi, K.; Ohdachi, S.; Yamamoto, S.; Nakajima, N.; Sakakibara, S.; Watanabe, K. Y.; Inagaki, S.; Nagayama, Y.; Narushima, Y.; Yamada, H.; Narihara, K.; Morita, S.; Akiyama, T.; Ashikawa, N.; Ding, X.; Emoto, M.; Funaba, H.; Goto, M.; Ida, K.; Idei, H.; Ido, T.; Ikeda, K.; Imagawa, S.; Isobe, M.; Itoh, K.; Kaneko, O.; Kawahata, K.; Kobuchi, T.; Komori, A.; Kubo, S.; Kumazawa, R.; Li, J.; Liang, Y.; Masuzaki, S.; Mito, T.; Miyazawa, J.; Morisaki, T.; Murakami, S.; Muto, S.; Mutoh, T.; Nagaoka, K.; Nakamura, Y.; Nakanishi, H.; Nishimura, K.; Nishizawa, A.; Noda, N.; Notake, T.; Ohkubo, K.; Ohtake, I.; Ohyabu, N.; Oka, Y.; Okamura, S.; Ozaki, T.; Peterson, B. J.; Sagara, A.; Saida, T.; Saito, K.; Sakamoto, R.; Sasao, M.; Sato, K.; Sato, M.; Satow, T.; Seki, T.; Shimozuma, T.; Shoji, M.; Sudo, S.; Tanaka, M. Y.; Tamura, N.; Tanaka, K.; Tsumori, K.; Uda, T.; Watari, T.; Weller, A.; Xu, Y.; Yamada, I.; Yokoyama, M.; Yoshimura, S.; Yoshimura, Y.; Yamazaki, K.; Matsuoka, K.; Motojima, O.; Hamada, Y.; Fujiwara, M.
Publisher:International Atomic Energy Agency
Place of Publication:Vienna
Date of Publication (YYYY-MM-DD):2003
Title of Proceedings:Fusion Energy 2002
Sequence Number:EX/S3-2
Physical Description:CD-ROM
Name of Conference/Meeting:19th Fusion Energy Conference
Place of Conference/Meeting:Lyon (FR)
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:Internal review
Audience:Experts Only
Abstract / Description:MHD stability of NBI heated plasmas and impacts of MHD modes on plasma confinement are intensively studied in the Large Helical Device (LHD). Three characteristic MHD instabilities were observed, that is, (1) pressure driven modes excited in the plasma edge, (2) pressure driven mode in the plasma core, and (3) Alfvén eigenmodes (AEs) driven by energetic ions. MHD mode excited in the edge region accompanies multiple satellites, and is called Edge Harmonic Modes (EHMs). EHM sometimes has a bursting character. The bursting EHM transiently decreases the stored energy by about 15 percents. In the plasma core region, m=2/n=1 pressure driven mode is typically destabilized. The mode often induces internal collapse in the higher beta regime more than 1 percent. The internal collapse appreciably affects the global confinement. Energetic ion driven AEs are often detected in NBI-heated LHD plasmas. Particular AE with the frequency 8-10 times larger than TAE-frequency was detected in high beta plasmas more than 2 percent. The AE may be related to helicity-induced AE. Excitation of these three types of MHD instabilities and their impacts on plasma confinement are discussed.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E5
External Affiliations:National Institute for Fusion Science, Toki, Japan; Dep. of Energy Eng. and Science, Nagoya Univ., Nagoya, Japan; Res. Lab. for Nucl. Reactors, Tokyo Inst. Tech., Tokyo, Japan; Southwestern Institute of Physics, Chengdu, China; Institute of Plasma Physics, Akademia Sinica, Hefei, China; Dep. of Fusion Science, Graduate Univ. of Advanced Studies, Hayama, Japan
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