Although experiments have demonstrated a feasibility of the electron-cyclotron-wave (ECW) non-inductive current start-up, the physical mechanism of the current start-up remains unclear, particularly the role of the preferential confinement of collisionless tail electron currents ( jTPC) and vertical charge-separation currents ( jVTF) . Therefore, jTPC and jVTF were observed using limiter probes during the ECW non-inductive current start-up on an ENN XunLong-50 (EXL-50) spherical torus to understand the significance of these values. It was found that jTPC increased and jVTF decreased during start-up, indicating a dominant role played by jTPC in this process. Furthermore, it was found that the product of the gas pressure and vertical magnetic field has a limit for the ECW non-inductive current start-up. Finally, we found that the ECW non-inductive current start-up can be realized only for sufficiently low vertical fields and gas pressures in EXL-50.

Experimental study of non-inductive current start-up using electron cyclotron wave on EXL-50 spherical torus / Wang, Mingyuan; Guo, Dong; Shi, Yuejiang; Chen, Bo; Liu, Bing; Song, Shaodong; Zhao, Xin; Song, Yunyang; Liu, Wenjun; Guan, Yupeng; Banerjee, Debabrata; Li, Songjian; Sun, Tiantian; Li, Yingying; Tian, Xiaomin; Zhu, Yubao; Song, Xianming; Dong, Jiaqi; Yuan, Baoshan; Martin Peng, Y-K. - In: PLASMA PHYSICS AND CONTROLLED FUSION. - ISSN 0741-3335. - 64:7(2022). [10.1088/1361-6587/ac70fb]

Experimental study of non-inductive current start-up using electron cyclotron wave on EXL-50 spherical torus

Liu, Bing;Zhao, Xin;Banerjee, Debabrata;
2022

Abstract

Although experiments have demonstrated a feasibility of the electron-cyclotron-wave (ECW) non-inductive current start-up, the physical mechanism of the current start-up remains unclear, particularly the role of the preferential confinement of collisionless tail electron currents ( jTPC) and vertical charge-separation currents ( jVTF) . Therefore, jTPC and jVTF were observed using limiter probes during the ECW non-inductive current start-up on an ENN XunLong-50 (EXL-50) spherical torus to understand the significance of these values. It was found that jTPC increased and jVTF decreased during start-up, indicating a dominant role played by jTPC in this process. Furthermore, it was found that the product of the gas pressure and vertical magnetic field has a limit for the ECW non-inductive current start-up. Finally, we found that the ECW non-inductive current start-up can be realized only for sufficiently low vertical fields and gas pressures in EXL-50.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2996649