TY - JOUR
T1 - High-field-side RF injection for excitation of electron Bernstein waves
AU - Yoneda, Ryota
AU - Hanada, Kazuaki
AU - Elserafy, Hatem
AU - Bertelli, Nicola
AU - Ono, Masayuki
N1 - Funding Information:
This work was supported by Japan/U.S. Cooperation in Fusion Research and Development in 2016 and 2017. The Author (R.Y.) kindly acknowledges the financial support from Kyushu University Program for Leading Graduate Schools, Advanced Graduate Program in Global Strategy for Green Asia. We thank Richard Haase, Ph.D, from Edanz Group for editing a draft of this manuscript.
Funding Information:
This work was supported by Japan/U.S. Cooperation in Fusion Research and Development in 2016 and 2017. The Author (R.Y.) kindly acknowledges the financial support from Kyushu University Program for Leading Graduate Schools Advanced Graduate Program in Global Strategy for Green Asia. We thank Richard Haase, Ph.D, from Edanz Group for editing a draft of this manuscript
Publisher Copyright:
© 2019 The Japan Society of Plasma Science and Nuclear Fusion Research.
PY - 2018
Y1 - 2018
N2 - An evaluation of high-field-side (HFS) X-mode injection for the electron-Bernstein-wave (EBW) scenario is performed using the GENRAY ray-tracing code. In the early stage of low-density plasma start-up, when the electron cyclotron resonance and upper hybrid resonance layers are close to each other, efficient and localized heating by the EBW is attainable. We show that, when the electron density rises, the HFS scenario spontaneously shifts to current drive with successful electron heating. This shift can be explained as a change in heating mechanism from collisional to electron cyclotron damping. Also, we discuss a possible O-X-B scenario to continue the plasma current drive beyond the formation of an over-dense plasma.
AB - An evaluation of high-field-side (HFS) X-mode injection for the electron-Bernstein-wave (EBW) scenario is performed using the GENRAY ray-tracing code. In the early stage of low-density plasma start-up, when the electron cyclotron resonance and upper hybrid resonance layers are close to each other, efficient and localized heating by the EBW is attainable. We show that, when the electron density rises, the HFS scenario spontaneously shifts to current drive with successful electron heating. This shift can be explained as a change in heating mechanism from collisional to electron cyclotron damping. Also, we discuss a possible O-X-B scenario to continue the plasma current drive beyond the formation of an over-dense plasma.
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U2 - 10.1585/PFR.13.3402115
DO - 10.1585/PFR.13.3402115
M3 - Article
AN - SCOPUS:85063613881
SN - 1880-6821
VL - 13
JO - Plasma and Fusion Research
JF - Plasma and Fusion Research
M1 - 3402115
ER -