Quasilinear carbon transport in an impurity hole plasma in LHD

Quasilinear carbon transport in an impurity hole plasma in LHD
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LHD 杂质空穴等离子体中的准线性碳传输

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发表时间：
2014
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通讯作者：
N. Pablant
N. Pablant
中科院分区：
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文献类型：
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作者：
D. Mikkelsen;K. Tanaka;M. Nunami;Tomo;H. Sugama;M. Yoshinuma;K. Ida;Yasuhiro Suzuki;M. Goto;S. Morita;B. Wieland;I. Yamada;R. Yasuhara;T. Tokuzawa;T. Akiyama;N. Pablant

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Comprehensive electrostatic gyrokinetic linear stability calculations for ion-scale microinstabilities in an LHD plasma with an ion-internal transport barrier (ITB) and carbon “impurity hole” are used to make quasilinear estimates of particle flux to explore whether microturbulence can explain the observed outward carbon fluxes that flow “up” the impurity density gradient. The ion temperature is not stationary in the ion-ITB phase of the simulated discharge, during which the core carbon density decreases continuously. To fully sample these varying conditions, the calculations are carried out at three radial locations and four times. The plasma parameter inputs are based on experimentally measured profiles of electron and ion temperature, as well as electron and carbon density. The spectroscopic line-average ratio of hydrogen and helium densities is used to set the density of these species. Three ion species (H,He,C) and the electrons are treated kinetically, including collisions. Electron instability driv...