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Chin. Phys., 2004, Vol. 13(6): 887-890    DOI: 10.1088/1009-1963/13/6/018
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Sawtooth-like electron density oscillations under laser blow-off and lower hybrid current drive in HL-1M tokamak

Zhou Yana, Jiao Yi-Mingb, Deng Zhong-Chaoc, Gao Qing-Dic
a School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China; b School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China; Southwestern Institute of Physics, Chengdu 610041, China; c Southwestern Institute of Physics, Chengdu 610041, China
Abstract  By using of a six-channel HCN laser interferometer, the sawtooth-like density oscillations without being exhibited in the ohmic phase plasma have been observed during lower hybrid current drive (LHCD) discharges in the HL-1M device. There are often accompanied by injected impurity with laser blow-off. Analyses show that this kind of density sawtooth-like oscillation comes from the mutual effect of LHCD and impurity. An available mechanism is the loss of superthermal electrons by the magnetic perturbation, which is caused by the crash of the central accumulated impurities.
Keywords:  laser blow-off      lower hybrid current drive      superthermal electrons      sawtooth-like density oscillations     
Received:  16 October 2003      Published:  05 July 2005
PACS:  52.80.-s (Electric discharges)  
  52.35.Hr (Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))  
  52.38.-r (Laser-plasma interactions)  
  52.55.Fa (Tokamaks, spherical tokamaks)  
  52.25.Vy (Impurities in plasmas)  
  52.35.Fp (Electrostatic waves and oscillations (e.g., ion-acoustic waves))  
Fund: Project supported by the Nuclear Science Foundation (Grant No H7196c0302) and the National Natural Science Foundation of China (Grant Nos 10075016, 10135020 and 10275018).

Cite this article: 

Jiao Yi-Ming, Zhou Yan, Deng Zhong-Chao, Gao Qing-Di Sawtooth-like electron density oscillations under laser blow-off and lower hybrid current drive in HL-1M tokamak 2004 Chin. Phys. 13 887

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