Please wait a minute...
Chinese Physics, 2004, Vol. 13(9): 1500-1509    DOI: 10.1088/1009-1963/13/9/024
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Evolution of local ideal helical perturbations in cylindrical plasma

Zhang Wen-Lu (张文禄), Li Ding (李定)
Department of Modern Physics, University of Science and Technology of China, Hefei 230027, China
Abstract  The evolution of a local helical perturbation and its stability property for arbitrary magnetic shear configurations are investigated for the case of in cylindrical geometry. An analytic stability criterion has been obtained which predicts that a strong magnetic shear will enhance the instability in the positive shear region but enhance the stability in the negative shear region. The perturbations with the poloidal and toroidal perturbation mode numbers m/n=1/1 is most unstable due to the stabilizing terms increasing with m. For m/n=1/1 local perturbations in the conventional positive magnetic shear (PMS) configurations, a larger $q_{\rm min}$ exhibits a weaker shear in the core and is favourable to the stability, while in the reversed magnetic shear (RMS) configurations, a larger $q_0$ corresponds to a stronger positive shear in the middle region, which enhances the instability. No instabilities are found for m≥2 local perturbations. The stability for RMS configuration is not better than that for PMS configuration.
Keywords:  time expanding method      local ideal helical perturbation      cylindrical plasma  
Received:  15 March 2004      Revised:  24 December 2003      Accepted manuscript online: 
PACS:  52.55.Fa (Tokamaks, spherical tokamaks)  
  52.65.Vv (Perturbative methods)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10175065, 40244006, 40336052).

Cite this article: 

Zhang Wen-Lu (张文禄), Li Ding (李定) Evolution of local ideal helical perturbations in cylindrical plasma 2004 Chinese Physics 13 1500

[1] Analysis of Landau damping in radially inhomogeneous plasma column
H Rajabalinia-Jelodar, M K Salem, F M Aghamir, H Zakeri-Khatir. Chin. Phys. B, 2018, 27(5): 055203.
[2] Laser-driven relativistic electron dynamics in a cylindrical plasma channel
Pan-Fei Geng(耿盼飞), Wen-Juan Lv(吕文娟), Xiao-Liang Li(李晓亮), Rong-An Tang(唐荣安), Ju-Kui Xue(薛具奎). Chin. Phys. B, 2018, 27(3): 035201.
[3] Landau damping in a bounded magnetized plasma column
H. Zakeri-Khatir, F. M. Aghamir. Chin. Phys. B, 2015, 24(2): 025201.
No Suggested Reading articles found!