Details

Autor(en) / Beteiligte

• SHIMOZUMA, Takashi
• TAKAHASHI, Hiromi
• KUBO, Shin
• YOSHIMURA, Yasuo
• IGAMI, Hiroe
• NISHIURA, Masaki
• OGASAWARA, Shinya
• MAKINO, Ryohei
• IDEI, Hiroshi
• MARUSHCHENKO, Nikolai B
• TURKIN, Yuri
• MUTOH, Takashi

Titel

High Harmonic ECH Experiment for Extension of Heating Parameter Regime in LHD

Ist Teil von

• Plasma and Fusion Research, 2013/06/19, Vol.8, pp.2402073-2402073

Ort / Verlag

The Japan Society of Plasma Science and Nuclear Fusion Research

Erscheinungsjahr

2013

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• High harmonic electron cyclotron resonance heating (ECH) can extend the plasma heating region to higher density and higher β compared to the normal heating scenario. In this study, the heating characteristics of the second-harmonic ordinary (O2) and third-harmonic extraordinary (X3) modes and the possible extension of heating regime are experimentally confirmed. At the same time, a comparative study using ray-tracing calculation was performed in the realistic three-dimensional configuration of the Large Helical Device. The O2 mode heating showed a 40% absorption rate even above the X2 mode cut-off density. The X3 mode heating using powerful 77 GHz gyrotrons demonstrated an increase of about 40% in the central electron temperature in the plasmas at β-value of about 1%. These results were quantitatively explained to some extent by ray-tracing calculations.