Efficiency of fast wave current drive for a weakly relativistic plasma
- General Atomics, San Diego, CA (United States)
- Princeton Univ., NJ (United States). Plasma Physics Lab.
Current drive by fast waves (FWCD) is an important candidate for steady-state operation of tokamaks. Major experiments using this scheme are being carried out on DIII-D. There has been considerable study of the theoretical efficiency of FWCD. In Refs. 4 and 5, the nonrelativistic efficiency of FWCD at arbitrary frequencies was studied. For DIII-D parameters, the results can be considerably different from the Landau and Alfven limits. At the high temperatures of reactors and DIII-D upgrade, relativistic effects become important. In this paper, the relativistic FWCD efficiency for arbitrary frequencies is studied. Assuming that the plasma is weakly relativistic, i.e., T{sub e}/Mc{sup 2} is small, an analytic expression for FWCD is obtained for high resonant energies (U{sub ph}/u{sub Te}{much_gt}). Comparisons with the results from a numerical code ADJ and the nonrelativistic results shall be made and analytical fits in the whole range of velocities shall be presented.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114; AC02-76CH03073
- OSTI ID:
- 10151625
- Report Number(s):
- GA-A-21254; CONF-9304112-4; ON: DE93012775
- Resource Relation:
- Conference: 10. topical conference on radio frequency power in plasmas,Boston, MA (United States),1-3 Apr 1993; Other Information: PBD: Apr 1993
- Country of Publication:
- United States
- Language:
- English
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