TY - GEN
T1 - The role of fast electrons on the non-inductive current ramp-up in QUEST
AU - Tashima, S.
AU - Zushi, H.
AU - Isobe, M.
AU - Okamura, S.
AU - Idei, H.
AU - Hanada, K.
AU - Sharma, S. K.
AU - Ryoukai, T.
AU - Ishiguro, M.
AU - Liu, H.
PY - 2010
Y1 - 2010
N2 - The role of energetic electrons during the non-inductive current ramp-up is investigated in electron cyclotron heated plasma (≤ 60kW) in the spherical tokamak QUEST. The pulse height analysis of the hard X-ray (HX) is carried out with a fast time resolution of ≥1 ms, and acceleration of the electrons are studied by measuring the evolution of spectrum. It is found that wall recycling condition affects the formation of the tokamak configuration from an initial open magnetic field configuration. The vertical magnetic field Bz dependence of driven current Ip (~ 11 kA) is compared with those of HXs for studying contribution of fast electron. For high recycling case, Ip and HXs show peaks at an optimal low value of Bz/Bt = 7 ×10-3, however, for low recycling case, both increase monotonically with B z/Bt = 7 ×10-3 - 21×10 -3.
AB - The role of energetic electrons during the non-inductive current ramp-up is investigated in electron cyclotron heated plasma (≤ 60kW) in the spherical tokamak QUEST. The pulse height analysis of the hard X-ray (HX) is carried out with a fast time resolution of ≥1 ms, and acceleration of the electrons are studied by measuring the evolution of spectrum. It is found that wall recycling condition affects the formation of the tokamak configuration from an initial open magnetic field configuration. The vertical magnetic field Bz dependence of driven current Ip (~ 11 kA) is compared with those of HXs for studying contribution of fast electron. For high recycling case, Ip and HXs show peaks at an optimal low value of Bz/Bt = 7 ×10-3, however, for low recycling case, both increase monotonically with B z/Bt = 7 ×10-3 - 21×10 -3.
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M3 - Conference contribution
AN - SCOPUS:84875675736
SN - 9781622763313
T3 - 37th EPS Conference on Plasma Physics 2010, EPS 2010
SP - 1716
EP - 1719
BT - 37th EPS Conference on Plasma Physics 2010, EPS 2010
T2 - 37th EPS Conference on Plasma Physics 2010, EPS 2010
Y2 - 21 June 2010 through 25 June 2010
ER -