Ideal-MHD beta limits: scaling laws and comparison with Doublet III high-beta plasmas
Doublet III (DIII) recently has achieved a value for ..beta.., the ratio of volume averaged plasma to magnetic pressure, of 4.5%. This ..beta.. value is in the range required for an economically attractive tokamak reactor, and also close to the relevant limit predicted by ideal-MHD theory. It is therefore of great interest to assess the validity of the theory by comparison with experiment and thus to have a basis for the prediction of future reactor performance. A large variety of plasma shapes have been obtained in DIII. These shapes can be divided into two classes: (1) limiter discharges, and (2) diverted discharges, which are of great interest because of their good confinement in the H-mode operation. We derive simple scaling laws from the variation of optimized ideal-MHD beta limits (..beta../sub c/) with plasma shape parameters. The current profile is optimized for fixed plasma shapes, separately for the high-n (ballooning) and the low-n (kink) modes. Results are presented in the form of suitability normalized curves of ..beta.. versus poloidal beta, ..beta../sub p/, for both ballooning and kink modes in order to simultaneously compare all the DIII experimental data.
- Research Organization:
- GA Technologies, Inc., San Diego, CA (USA)
- DOE Contract Number:
- AT03-76ET51011
- OSTI ID:
- 5806682
- Report Number(s):
- GA-A-17144; CONF-830908-4; ON: DE83015873; TRN: 83-022247
- Resource Relation:
- Conference: 11. European conference on controlled fusion and plasma physics, Aachen, F.R. Germany, 5 Sep 1983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DOUBLET REACTORS
BETA RATIO
SCALING LAWS
BALLOONING INSTABILITY
CURRENT DENSITY
HIGH-BETA PLASMA
INSTABILITY
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
700200* - Fusion Energy- Fusion Power Plant Technology