Chin. Phys. Lett.  1994, Vol. 11 Issue (11): 677-680    DOI:
Original Articles |
Model on L- to H-Mode Transition Driven with Lower-Hybrid Wave
QIU Xiaoming (X. M. Qiu);BAI Lin (L. Bai)
Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041
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QIU Xiaoming (X. M. Qiu), BAI Lin (L. Bai) 1994 Chin. Phys. Lett. 11 677-680
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Abstract In this letter, a model for active suppressing tokamak edge turbulence and hence inducing the L-mode to H-mode transition with lower-hybrid wave (LHW) is proposed. The model includes the two contents: (a) The poloidal sheared flow of plasma is generated by the ponderomotive potential and induced magnetization acting on a tokamak plasma resulting from the oscillating electric field of the injected LHW. (b) During the time the LHW is injected into tokamak edge, the edge turbulence and the LHW-generated plasma poloidal flow compete with each other; if the shear of plasma poloidal flow is large enough to suppress the edge turbulence, the confinement will be remarkably improved and hence the system will enter the H operating mode. This model leads us to find that the threshold LHW power required for edge-turbulence suppression is proportional to A(ω) ≡ (ω / ωLH )2 |(ω / ωLH )2-1|, which enables us to explain the experiment in the JT-60 tokamak with lower-hybrid current drive.


Keywords: 52.55.Fa      52.50.Gj      52.30.Bt     
Published: 01 November 1994
PACS:  52.55.Fa (Tokamaks, spherical tokamaks)  
  52.50.Gj (Plasma heating by particle beams)  
  52.30.Bt  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y1994/V11/I11/0677
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QIU Xiaoming (X. M. Qiu)
BAI Lin (L. Bai)
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