EAST装置H模时的电子热输运系数

Electron Thermal Conductivity in H-mode in EAST

研究了在先进实验超导托卡马克（EAST）上，由低杂波（LHW）和离子循环射频（ICRF）加热实现高约束模式（H模）放电的等离子体中的电子热输运情况。通过计算得出，H模相比于L模（低约束模式）电子热输运系数显著下降，特别是在等离子体边缘地区。在典型炮号（33068#、38300#、40823#）中，归一化温度梯度特征长度（R/LTe）的阈值应该是3-11。这三炮的约束时间与电子热输运系数相关，当电子热输运系数越大时，约束时间越小。

Electron thermal transport in typical shots of high-confinement （H-mode） achieved with Lower Hybrid Wave （LHW） ,LHW and Ion Cycle Radio Frequency （ICRF） together is studied in EAST. The electron thermal conductivity during H-mode significantly decreases in comparison to L-mode, especially in the edge area. For these typical shots, the threshold value of R/LTe should be 3 to 11. The values of confinement time in three shots are related to the electron thermal conductivities. When the electron thermal conductivity is bigger, confinement time would be smaller.