TY - JOUR
T1 - High βp plasma formation using off-axis ECCD in Ohmic heated plasma in the spherical tokamak QUEST
AU - QUEST Team
AU - Mishra, Kishore
AU - Zushi, H.
AU - Idei, H.
AU - Hasegawa, M.
AU - Hanada, K.
N1 - Publisher Copyright:
© Owned by the authors, published by EDP Sciences, 2015.
PY - 2015/3/12
Y1 - 2015/3/12
N2 - High poloidal beta (εβp ~ 1) operation in steady state condition in tokamaks is of great interest and has previously been demonstrated using NBI, LHCD and low current (Ip) plasma for a short time (<0.5 s). A very few experiments however, have been performed towards the investigation of highest obtainable βp in tokamak plasma. In this work we report the first result of high βp production and its sustainment though an off axis ECCD at two different frequencies (fundamental and second harmonic) in Ohmic (OH) target plasma. With application of ECCD, plasma βp increased to encounter an equilibrium limit and the standard limiter configuration is transformed to an Inboard Poloidal field Null (IPN) configuration. Both off-axis and on-axis ECCD is studied and found to have some distinctive features, which are discussed in this paper.
AB - High poloidal beta (εβp ~ 1) operation in steady state condition in tokamaks is of great interest and has previously been demonstrated using NBI, LHCD and low current (Ip) plasma for a short time (<0.5 s). A very few experiments however, have been performed towards the investigation of highest obtainable βp in tokamak plasma. In this work we report the first result of high βp production and its sustainment though an off axis ECCD at two different frequencies (fundamental and second harmonic) in Ohmic (OH) target plasma. With application of ECCD, plasma βp increased to encounter an equilibrium limit and the standard limiter configuration is transformed to an Inboard Poloidal field Null (IPN) configuration. Both off-axis and on-axis ECCD is studied and found to have some distinctive features, which are discussed in this paper.
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U2 - 10.1051/epjconf/20158702012
DO - 10.1051/epjconf/20158702012
M3 - Conference article
AN - SCOPUS:84925432724
SN - 2101-6275
VL - 87
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
M1 - 02012
T2 - 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, EC 2014
Y2 - 22 April 2014 through 25 April 2014
ER -