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Chin. Phys., 2004, Vol. 13(12): 2097-2104    DOI: 10.1088/1009-1963/13/12/021

Bootstrap current fraction scaling for spherical torus plasmas

Shi Bing-Ren
Southwestern Institute of Physics, Chengdu 610041, China
Abstract  Dependence of the bootstrap current fraction of spherical torus plasma on the aspect ratio and the triangular deformation is studied by using a simple equilibrium model, the Solov'ev-type equilibrium. Two bootstrap current models are used: one is the single-ion collisionless regime model, the other is the recently developed arbitrary collisional regime model. It is found that besides the well known favourable effect of the small aspect ratio on the enhancement of the bootstrap current fraction, the triangularity is beneficial for raising the total bootstrap current though it does not change its fraction much.
Keywords:  bootstrap current      triangular deformation      spherical torus  
Received:  11 March 2004      Revised:  22 June 2004      Published:  17 March 2005
PACS:  52.20.Hv (Atomic, molecular, ion, and heavy-particle collisions)  
  52.55.Fa (Tokamaks, spherical tokamaks)  
  52.25.-b (Plasma properties)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10375018).

Cite this article: 

Shi Bing-Ren Bootstrap current fraction scaling for spherical torus plasmas 2004 Chin. Phys. 13 2097

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