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Title: Influence of trapped electrons on ECCD in Heliotron J
Authors: Nagasaki, K.  kyouindb  KAKEN_id  orcid (unconfirmed)
Yamamoto, S.  kyouindb  KAKEN_id
Yoshino, H.
Sakamoto, K.
Marushchenko, N.B.
Turkin, Y.
Mizuuchi, T.  kyouindb  KAKEN_id
Okada, H.  kyouindb  KAKEN_id
Hanatani, K.
Minami, T.
Masuda, K.  kyouindb  KAKEN_id
Kobayashi, S.
Konoshima, S.
Takeuchi, M.
Nakamura, Y.  kyouindb  KAKEN_id  orcid (unconfirmed)
Ohshima, S.  kyouindb  KAKEN_id  orcid (unconfirmed)
Mukai, K.
Lee, H.Y.
Mizuno, K.
Yoshimura, Y.
Motojima, G.
Cappa, Á.
Blackwell, B.D.
Sano, F.  KAKEN_id
Author's alias: 長崎, 百伸
Issue Date: Sep-2011
Journal title: Nuclear Fusion
Volume: 51
Issue: 10
Thesis number: 103035
Abstract: Second-harmonic electron cyclotron current drive (ECCD) experiments have been performed in the stellarator/heliotron (S/H) device, Heliotron J. A focused Gaussian beam is injected with the parallel refractive index, N||, ranging from −0.05 to 0.6. The EC driven current is estimated by excluding the bootstrap current from the total current. The experimental results show that the EC driven current is determined by the local magnetic field structure where the EC power is deposited. The maximum EC driven current is attained around N|| = 0.5 when the EC power is deposited at nearly the top of the magnetic ripple. A large increase in electron cyclotron emission (ECE) signals is observed when the EC current is driven, indicating an important role for high-energy electrons in the ECCD. The experimental results for N|| and B dependence agree with a ray-tracing simulation using a parallel momentum conservation model in which the trapped particle effect is included.
Rights: © 2011 IAEA, Vienna
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1088/0029-5515/51/10/103035
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