BOOTSTRAP CURRENT FOR SMALL ASPECT RATIO TOKAMAK EQUILIBRIA

Autores

  • P. H. Sakanaka
  • D. L. G. Andreatta
  • S. Tokuda

DOI:

https://doi.org/10.17563/rbav.v11i2.374

Resumo

We present equilibrium features of the very small aspect ratio tokamak, TBR-2E, with the aspect ratio of 1.6, which is being designed in Brazil – a joint project with participation of the University of São Paulo, the State University of Campinas, and the National Institute for Space Research. The equilibria have been studied by using the SELENE-J code developed at JAERI, Japan, by Tokuda et al. We have concentrated our study on the determination or the stability limit by using the critical pressure criterium for ballooning stability limit by using the critical pressure criterium for ballooning stability and Mercier criterium for other MHD modes. The β – limit values were calculated for the case of the non-inductive current and found that its maximum lies at elongation of 1.7. Increasing the the triangularity, the β- limit values increase, but the maximum continues to stay at the same value of elongation. We have also studied the effect of the neoclassical transport properties by changing the plasma temperature (or β values). In particular, we have studied the trapped particles and bootstrap current. We have found that at temperatures as low as 600 eV the transport is already in banana regime and that the bootstrap current may account for a significant part of the total plasma current.

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Publicado

2008-09-19

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