Abstract
This paper reports the recent status of the ECRH system in the LHD and introduces the experimental results that suggest the reasonable effects of the wave-plasma interaction in the plasma boundary including outside the LCFS. With increasing the available ECRH power, ECRH/ECCD have been performed in higher density target plasmas where the mode coupling between the O-mode and the X-mode caused by the magnetic shear occurs for long distance in the low density region of the plasma boundary including the ergodic layer outside the LCFS. In such a case, the incident polarization should be set by taking into account the mode coupling effect. Moreover, the refraction in the boundary region should be considered for accurate numerical prediction of the wave trajectory and power absorption with use of the ray-tracing calculation.
| Original language | English |
|---|---|
| Article number | 02011 |
| Journal | EPJ Web of Conferences |
| Volume | 87 |
| DOIs | |
| Publication status | Published - Mar 12 2015 |
| Event | 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2014 - Nara, Japan Duration: Apr 22 2014 → Apr 25 2014 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Cite this
Recent upgrading of ECRH system and studies to improve ECRH performance in the LHD. / Lhd Experiment Group.
In: EPJ Web of Conferences, Vol. 87, 02011, 12.03.2015.Research output: Contribution to journal › Conference article
}
TY - JOUR
T1 - Recent upgrading of ECRH system and studies to improve ECRH performance in the LHD
AU - Lhd Experiment Group
AU - Igami, Hiroe
AU - Kubo, Shin
AU - Shimozuma, Takashi
AU - Yoshimura, Yasuo
AU - Takahashi, Hiromi
AU - Kamio, Shuji
AU - Kobayashi, Sakuji
AU - Ito, Satoshi
AU - Mizuno, Yoshinori
AU - Okada, Kohta
AU - Makino, Ryohei
AU - Ogasawara, Shinya
AU - Kobayashi, Kenya
AU - Osakabe, Masaki
AU - Nagasaki, Kazunobu
AU - Idei, Hiroshi
AU - Idei, Hiroshi
PY - 2015/3/12
Y1 - 2015/3/12
N2 - This paper reports the recent status of the ECRH system in the LHD and introduces the experimental results that suggest the reasonable effects of the wave-plasma interaction in the plasma boundary including outside the LCFS. With increasing the available ECRH power, ECRH/ECCD have been performed in higher density target plasmas where the mode coupling between the O-mode and the X-mode caused by the magnetic shear occurs for long distance in the low density region of the plasma boundary including the ergodic layer outside the LCFS. In such a case, the incident polarization should be set by taking into account the mode coupling effect. Moreover, the refraction in the boundary region should be considered for accurate numerical prediction of the wave trajectory and power absorption with use of the ray-tracing calculation.
AB - This paper reports the recent status of the ECRH system in the LHD and introduces the experimental results that suggest the reasonable effects of the wave-plasma interaction in the plasma boundary including outside the LCFS. With increasing the available ECRH power, ECRH/ECCD have been performed in higher density target plasmas where the mode coupling between the O-mode and the X-mode caused by the magnetic shear occurs for long distance in the low density region of the plasma boundary including the ergodic layer outside the LCFS. In such a case, the incident polarization should be set by taking into account the mode coupling effect. Moreover, the refraction in the boundary region should be considered for accurate numerical prediction of the wave trajectory and power absorption with use of the ray-tracing calculation.
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U2 - 10.1051/epjconf/20158702011
DO - 10.1051/epjconf/20158702011
M3 - Conference article
VL - 87
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
SN - 2101-6275
M1 - 02011
ER -