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Zhang, Y. P.; Mazon, D.; Peysson, Y.; Malard, P.; Zhang, P. F.; Zhang, J.; Zou, X. L.; Zhou, J.; Xu, H. B.; Bai, X. Y.; Yang, J. W.; Yuan, G. L.; Song, X. Y.; Li, X.; Zhong, W. L.; Ding, X. T.; Chen, W.; Li, Y. G.; Hoang, T.; Delpech, L.; Ekedahl, A.; Isobe, M.; Song, X. M.; Lu, B.; Liu, Yi; Shi, Z. B.; Yang, Q. W.; Xu, M.; Duan, X. R.; Liu, Y.
AIP advances, 08/2019, Letnik: 9, Številka: 8Journal Article
Physics related to fast electrons in lower hybrid (LH) current drive (LHCD) plasma is a very important issue, since these particles will play an important role in runaway electron (RE) generation and lower hybrid wave (LHW)-related physics. Utilizing a new hard X-ray (HXR) pinhole camera, recent HL-2A tokamak experiments have devoted to enhancing the understanding of the physics on fast electrons and LHW. The fast electron bremsstrahlung (FEB) emission in the HXR energy range between 20 and 200 keV was measured by the HXR camera. To study the conversion of LHW-produced fast electrons into REs, a very short pulse of LHW, so-called “blip”, with duration of 5 ms was injected into the plasma during the current flattop phase. A strong enhancement of REs was induced by the blip injection. Measurements from the HXR camera show that the fast electrons generated by LHWs is mainly concentrated in 40-60 keV, which is well consistent with the calculated value based on Landau damping theory. The energy of these seed electrons is higher than the critical runaway energy. This phenomenon may be come from the synergetic effects of Dreicer and avalanche RE generation. Moreover, the measurements indicate that the spatial distribution of the fast electrons during LHCD has a peaked profile, implying that the fast electrons are mainly produced in the plasma core. It also suggests that the energy of the LHW mainly deposited in the plasma core region.
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