Speaker
Xianmei Zhang
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.1089.pdf
Gyrokinetic Simulation for Trapped Electron Mode during dominant
electron heating in EAST Tokamak
X.M. Zhang1*, W.D. Chen1, E.B. Xue 1, L.M. Yu1, and the EAST Team2
1
Department of Physics, School of Science, East China University of Science and
Technology, Shanghai 200237, China
2
Institute of Plasma Physics, Chinese Academy of sciences, Hefei 230031, China
The mechanism and behavior of trapped electron mode (TEM) is very important to study
confinement and transport during electron dominant heating in tokamak [1-3]. Simulations of
TEM have been performed for some typical discharges with dominant electron heating by using
gyro-kinetic simulation code GTC in EAST.
Calculation results show that the ratio of electron temperature to ion temperature Te/Ti and
logarithmic density gradient R/Ln are main factors of affecting on TEM linear growth rate 𝛾
rather than electron temperature Te individually and normalized electron ion temperature
logarithmic gradient R/LTe. For safety factor q and magnetic shear 𝑠̂ , the dependences of TEM
linear growth rate are complex with different 𝑠̂ value in the range of normalized minor radius
<0.6. When 𝑠̂ is larger than 0.5 within <0.6, 𝛾 increases with q while decreases with 𝑠̂ ,
which is consistent with theoretical analysis by the reduced model. However, when 𝑠̂ is
smaller than 0.5 within <0.6, the opposite results are obtained, namely 𝛾 decreases with q
while increases with 𝑠̂ .
References:
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[2] Ryter F et al. 2005 Phys. Rev. Lett. 95 085001
[3] Bonanomi N et al. 2015 Nucl. Fusion. 55 113016
[4] Xie H S et al. 2017 Phys. Rev. Lett. 118 095001
[5] Xiao Y et al. 2007 Phys. Plasmas. 14 055910
[6] Bravenec R V et al. 2013 Phys. Plasmas. 20 104506
[7] Anderson J et al. 2006 Plasma Phys. Contr. F. 48 651
