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          Institute: MPI für Plasmaphysik     Collection: Conference Papers     Display Documents

ID: 60437.0, MPI für Plasmaphysik / Conference Papers
RF heating and current drive on NSTX with high
harmonic fast waves
Authors:Ryan, P. M.; Rosenberg, A. L.; Swain, D. W.; Wilson, J. R.; Batchelor, D. B.; Bell, M. G.; Bell, R. E.; Bernabei, S.; Bitter, J. M.; Bonoli, P. T.; Brambilla, M.; Cardinali, A.; Carter, M. D.; Darrow, D.; Frederickson, E.; Gates, D.; Hosea, J. C.; Jaeger, E. F.; Kaye, S. M.; LeBlanc, B. P.; Maingi, R.; Mau, T. K.; Medley, S. S.; Menard, J. E.; Mueller, D.; Ono, M.; Paoletti, F.; Peng, Y.-K. M.; Phillips, C. K.; Pinsker, R. I.; Rasmussen, D. A.; Sabbagh, S. A.; Synakowski, E. J.; Wilgen, J. B.; NSTX Team
Publisher:International Atomic Energy Agency
Place of Publication:Vienna
Date of Publication (YYYY-MM-DD):2003
Title of Proceedings:Fusion Energy 2002
Sequence Number:EX/P2-13
Physical Description:CD-ROM
Name of Conference/Meeting:19th Fusion Energy Conference
Place of Conference/Meeting:Lyon (FR)
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:Internal review
Audience:Experts Only
Abstract / Description: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 ~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.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/Tokamak Theory (TOK)
External Affiliations:Oak Ridge National Laboratory, Oak Ridge, TN, USA; Princeton Plasma Physics Laboratory, Princeton, NJ, USA; Massachusetts Institute of Technology – PSFC, Cambridge, MA; ENEA-Frascati, Frascati, Italy; University of California – San Diego, La Jolla, CA, USA; Columbia University, New York, NY, USA; General Atomics, La Jolla, CA, USA
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