Efficient Generation of Non-Inductive, Off-axis, Ohkawa Current, Driven by Electron Bernstein Waves in High Beta, Spherical Torus Plasmas
- Princeton Plasma Physics Laboratory
Off-axis rf-driven current can play a critical role in sustaining high Beta spherical torus (ST) plasmas without a central solenoid. Numerical modeling of electron Bernstein wave current drive (EBWCD) for a {Beta} {approx} 40% ST plasma predicts efficient, off-axis, Ohkawa EBWCD. Current can be efficiently driven at r/a greater than 0.5 where the large trapped electron fraction precludes conventional Fisch-Boozer current drive and provides near-ideal conditions for Ohkawa EBWCD. Also, Ohkawa EBWCD efficiency increases with r/a. Enhancement over Fisch-Boozer current drive is a factor of two at r/a {approx} 0.2 rising to over an order of magnitude at r/a {approx} 0.5.
- Research Organization:
- Princeton Plasma Physics Lab., Princeton, NJ (US)
- Sponsoring Organization:
- USDOE Office of Science (SC) (US)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 827839
- Report Number(s):
- PPPL-3943
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electron Bernstein Wave Research on the National Spherical Torus Experiment
Electron Bernstein Wave Research on the National Spherical Torus Experiment
Electron Bernstein Wave Research on the National Spherical Torus Experiment
Technical Report
·
Thu Apr 21 00:00:00 EDT 2005
·
OSTI ID:839173
Electron Bernstein Wave Research on the National Spherical Torus Experiment
Journal Article
·
Mon Sep 26 00:00:00 EDT 2005
· AIP Conference Proceedings
·
OSTI ID:20726339
Electron Bernstein Wave Research on the National Spherical Torus Experiment
Conference
·
Fri Dec 31 23:00:00 EST 2004
·
OSTI ID:1003639