Slide-away discharges are achieved by decreasing the plasma density or ramping down the plasma current in runaway discharges in the HT-7 tokamak. In the case of plasma current ramp down, the ratio of the electron plasma frequency to the electron cyclotron frequency is higher than in the stationary pulses when the discharge goes into a slide-away regime. The instability regime is characterized by relaxations in the electron cyclotron emission due to relativistic anomalous Doppler effect which transfers energy from parallel to perpendicular motion. The triggering of relativistic anomalous Doppler effect at higher density by ramping down of plasma current may provide a alternative runaway energy control scenario.
Slide-away discharges are achieved by decreasing the plasma density or ramping down the plasma current in runaway discharges in the HT-7 tokamak. In the case of plasma current ramp down, the ratio of the electron plasma frequency to the electron cyclotron frequency is higher than in the stationary pulses when the discharge goes into a slide-away regime. The instability regime is characterized by relaxations in the electron cyclotron emission due to relativistic anomalous Doppler effect which transfers energy from parallel to perpendicular motion. The triggering of relativistic anomalous Doppler effect at higher density by ramping down of plasma current may provide a alternative runaway energy control scenario.
CHEN Zhong-Yong;WAN Bao-Nian;LING Bi-Li;GAO Xiang;DU Qin;TI Ang;LIN Shi-Yao;S. Sajjad;HT- Team. Runaway Electron Beam Instability in Slide-Away Discharges in the HT-7 Tokamak[J]. 中国物理快报, 2007, 24(11): 3195-3198.
CHEN Zhong-Yong, WAN Bao-Nian, LING Bi-Li, GAO Xiang, DU Qin, TI Ang, LIN Shi-Yao, S. Sajjad, HT- Team. Runaway Electron Beam Instability in Slide-Away Discharges in the HT-7 Tokamak. Chin. Phys. Lett., 2007, 24(11): 3195-3198.
[1] Knoepfel H et al 1979 Nucl. Fusion 19 785 [2] Kadomtsev B B et al 1967 Zh. Ehksp. Teor. Fiz. 53 2025 [3] Parail V V and Pogutse O P 1978 Nucl. Fusion 18 303 [4] Brossier P 1978 Nucl. Fusion 18 1069 [5] Equipe T F R 1976 Nucl. Fusion 16 473 [6] Vlasenkov V S et al 1973 Nucl. Fusion 13 509 [7] Vlikaev A V et al 1975 Sov. J. Plasma Phys. 1 303 [8] Oomens A A M et al 1976 Phys. Rev. Lett. 36 255 [9] Coppi B et al 1976 Nucl. Fusion 16 309 [10] Fussmann G et al 1981 Phys. Rev. Lett. 47 1004 [11] Wu C S and Qiu X M 1983 J. Geophys. Res. 88 10072 [12] Martin-Solis J R et al 2002 Phys. Plasmas 9 1667 [13] Wan B N et al 2004 Nucl. Fusion 44 400 [14] Parail V V and Pogutse O P 1976 Sov. J. Plasma Phys. 2125
2007, Vol. 24 
