No abstract available
Source
China Nuclear Information Centre, Beijing (China); Southwestern Inst. of Physics, Chengdu (China); 117 p; Oct 2001; p. 87-89; ISBN 7-89998-074-7; 
[en] The authors mainly study the vertical displacement instability in a low-aspect-ratio tokamak, and discuss the relation between aspect-ratio and elongation. For low-aspect-ratio tokamaks, it is possible for the magnetic flux surface to have a larger elongation. Meanwhile, the authors also find that the elongation will tend to reduce when A ≤ √2, and the range of the triangular deformation parameter and the aspect-ratio of tokamak are subject to certain restrictions
Journal
Nuclear Fusion and Plasma Physics; ISSN 0254-6086; ; v. 18(3); p. 23-29
; v. 18(3); p. 23-29
[en] An ideal current distribution in the air-core transformer coils is obtained using variation principle. Climbing mountain method is utilized for optimizing the dimension and position of the real coils. Not only can the requirement of minimizing the stray field in the plasma region be guaranteed, but also integer turns for the coil can be realized. The latter brings a significant convenience to engineering
Journal
Nuclear Fusion and Plasma Physics; ISSN 0254-6086; ; v. 22(2); p. 86-89
; v. 22(2); p. 86-89
No abstract available
Source
China Nuclear Information Centre, Beijing (China); Southwestern Inst. of Physics, Chengdu (China); 117 p; Oct 2001; p. 90-93; ISBN 7-89998-074-7;
[en] Using a virtual-casing principle, the plasma boundary, plasma current center and X-point are identified for Tokamak de Varennes. Adaptive parameters in a polynomial, which is a solution of the Glad-Shafranov equation, are determined by a least square fit of the poloidal magnetic fields. Measurement of the magnetic field is performed using pick-up coils. The plasma current is initially regarded as one filament, then it is replaced by virtual-case currents, which produce a negative with same magnitudes confinement magnetic field inside the plasma. The iterative method is fast enough to get a picture for the plasma between the shots. The configuration reconstructed is in good agreement with the TV image taken by camera with a toroidal view
Journal
Nuclear Fusion and Plasma Physics; ISSN 0254-6086; ; v. 21(4); p. 209-214
; v. 21(4); p. 209-214
[en] The major disruption limits the operation of present tokamaks. Experimental evidences point out that the growth of tearing modes or the magnetic islands is primarily responsible for the occurrence. Taking the non-inductive current drive effects into account, a set of 3D nonlinear equation is derived. It is shown from simulation that the growth of the magnetic island is suppressed effectively by RF current drive. It is consistent with recent experiments on the HL-1 tokamak in which the plasma is stabilized by an RF current drive
Journal
Nuclear Fusion and Plasma Physics; ISSN 0254-6086; ; v. 24(1); p. 11-14
; v. 24(1); p. 11-14