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Accession Number DE2013-1081837
Title RF Heating and Current Drive on NSTX with High Harmonic Fast Waves.
Publication Date 2013
Media Count 5p
Personal Author A. L. Rosenberg D. B. Batchelor D. W. Swain J. M. Bitter J. R. Wilson M. G. Bell P. M. Ryan P. T. Bonoli R. E. Bell S. Bernabei
Abstract NSTX is a small aspect ratio tokamak (R = 0.85 m, a = 0.65 m). The High Harmonic Fast Wave (HHFW) system is a 30 MHz, 12-element array capable of launching both symmetric and directional wave spectra for plasma heating and non-inductive current drive. It has delivered up to 6 MW for short pulses and has routinely operated at approx. 3 MW for 100-400 ms pulses. Results include strong, centrally-peaked electron heating in both D and He plasmas for both high and low phase velocity spectra. H-modes were obtained with application of HHFW power alone, with stored energy doubling after the L-H transition. Beta poloidal as large as unity has been obtained with significant fractions (0.4) of bootstrap current. Differences in the loop voltage are observed depending on whether the array is phased to drive current in the co- or counter-current directions. A fast ion tail with energies extending up to 140 keV has been observed when HHFW interacts with 80 keV neutral beams; neutron rate and lost ion measurements, as well as modeling, indicate significant power absorption by the fast ions. Radial rf power deposition and driven current profiles have been calculated with ray tracing and kinetic full-wave codes and compared with measurements.
Keywords Current drive heating
Electrons
Harmonics
NSTX devices
Plasma waves
Pulses
Rf systems
Spectra
Thermonuclear reactors
Tokamak devices
Velocity

 
Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 77A - Thermonuclear Fusion Devices
46G - Plasma Physics
Corporate Author Oak Ridge National Lab., TN.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1323
Contract Number DE-AC05-00OR22725

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