Investigation of beta-limit improvement of helical type plasmas in L = 2 heliotron/torsatron devices by using higher harmonic modulation
- Univ. of Tokyo (Japan). Electrical Engineering Dept.
- Science Univ. of Tokyo (Japan). Electrical Engineering Dept.
In the case of the helical type magnetic confinement devices (stellarator, torsatron, heliotron) their plasma confinement properties and operational characteristics mainly depend on the magnetic configuration produced by their external coils. Devices of the helical type have the complicated magnet where the huge magnetic forces exist. The authors have already shown that the application of the higher harmonic modulation principle to the winding law of the helical coil of the L = 1 and L = 2 Heliotron Torsatron can reduce magnetic force on the helical coils. This finding is important form the viewpoint of the coil supporting technology of superconducting magnet. Also it was shown that proper values of the higher harmonic modulation constants can effectively produce the magnetic well in vacuum field. The presence of the magnetic well generally means the possibility of high beta operation, where beta is plasma pressure/magnetic pressure. In this study, the authors present calculation results for magnetohydrodynamic (MHD) equilibrium of plasma with non-zero beta value and for the dependence of the beta-limit on the variation of the modulation constants. The latter is important from the economical standpoint of the plasma confinement properties of the helical device. For these calculations a three-dimensional MHD spectral inverse equilibrium code VMEC was used.
- OSTI ID:
- 431500
- Report Number(s):
- CONF-960634-; TRN: IM9708%%328
- Resource Relation:
- Conference: 1996 IEEE international conference on plasma science, Boston, MA (United States), 3-5 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of IEEE conference record -- Abstracts: 1996 IEEE international conference on plasma science; PB: 324 p.
- Country of Publication:
- United States
- Language:
- English
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