Lower hybrid wave absorption study to improve the calculation of energy confinement time in EAST
Lower hybrid wave absorption study to improve the calculation of energy confinement time in EAST
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降低混合波吸收研究以改进EAST能量限制时间的计算
DOI：
10.1063/1.5047226
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发表时间：
2018-09
影响因子：
2.2
通讯作者：
Chen S.
中科院分区：
文献类型：
--
作者：
Gu X.;Shen B.;Li M.;Qian J.;Moreau D.;Ding S.;Sun Y.;Ding B.;Chen S.
为了改进能量限制时间的确定，对EAST中2.45 GHz和4.6 GHz低杂波的辅助加热功率吸收进行了分析。利用包括等离子体动能和极向磁场能量在内的总存储能量的时间导数，得到了LH光功率吸收系数。EAST的结果表明，在两个频率下，随着等离子体密度的增加和环向磁场的减小，吸收在等离子体中的LH光功率的比例减小。统计地得到了不同场、不同频率下LH光吸收系数随密度变化的标度律。将用新标度律得到的约束改善因子H89与假定吸收系数等于发射的k//波谱方向性的结果进行了比较。
The auxiliary heating power absorption of 2.45 GHz and 4.6 GHz lower hybrid (LH) waves in EAST is analysed in order to improve the determination of the energy confinement time. The LH power absorption coefficient is obtained by using the time derivative of the total stored energy including the plasma kinetic energy and the poloidal magnetic field energy. Results on EAST have shown that, for both frequencies, the fraction of LH power absorbed in the plasma bulk decreases with the increase in the plasma density, and with the decrease in the toroidal magnetic field. Scaling laws for the density dependence of the LH absorption coefficient at different fields and frequencies have been statistically obtained. Comparison of the confinement improvement factor H89 obtained with these new scaling laws against those assuming an absorption coefficient equal to the launched k//wave spectrum directivity is made.
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