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(EX/P2-13) RF Heating and Current Drive on NSTX With High Harmonic Fast Waves

P.M. Ryan¹⁾, A.L. Rosenberg²⁾, D.W. Swain¹⁾, J.R. Wilson²⁾, D.B. Batchelor¹⁾, M.G. Bell²⁾, R.E. Bell²⁾, S. Bernabei²⁾, J.M. Bitter²⁾, P.T. Bonoli³⁾, M. Brambilla⁴⁾, A. Cardinali⁵⁾, M.D. Carter¹⁾, D. Darrow²⁾, E. Frederickson²⁾, D. Gates²⁾, J.C. Hosea²⁾, E.F. Jaeger¹⁾, S.M. Kaye²⁾, B.P. LeBlanc²⁾, R. Maingi¹⁾, T.K. Mau⁶⁾, S.S. Medley²⁾, J.E. Menard²⁾, D. Mueller²⁾, M. Ono²⁾, F. Paoletti⁷⁾, Y-K. M. Peng¹⁾, C.K. Phillips²⁾, R.I. Pinsker⁸⁾, D.A. Rasmussen¹⁾, S.A. Sabbagh⁷⁾, E.J. Synokowski²⁾, J.B. Wilgen¹⁾, NSTX Team
 
¹⁾ Oak Ridge National Laboratory, Oak Ridge, TN, USA
²⁾ Princeton Plasma Physics Laboratory, Princeton, NJ, USA
³⁾ Massachusetts Institute of Technology – PSFC, Cambridge, MA
⁴⁾ Max-Planck Institut für Plasmaphysik, Garching, Germany
⁵⁾ ENEA-Frascati, Frascati, Italy
⁶⁾ University of California – San Diego, La Jolla, CA, USA
⁷⁾ Columbia University, New York, NY, USA
⁸⁾ General Atomics, La Jolla, CA, USA

Abstract.  NSTX is a small aspect ratio tokamak with a large dielectric constant (50-100); under these conditions high harmonic fast waves (HHFW) will readily damp on electrons via Landau damping and TTMP. The 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 rountinely operated at $\sim$3-4 MW for 100-200 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 large fractions (0.4) of bootstrap current. 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 power deposition profiles are being calculated with ray tracing and kinetic full-wave codes and benchmarked against measurements.

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