NSTX Electron Bernstein Wave Research - Taylor 1 of 8 Supported by Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics.

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NSTX Electron Bernstein Wave Research - Taylor 1 of 8 Supported by Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics NYU ORNL PPPL PSI SNL UC Davis UC Irvine UCLA UCSD U Maryland U New Mexico U Rochester U Washington U Wisconsin Culham Sci Ctr Hiroshima U HIST Kyushu Tokai U Niigata U Tsukuba U U Tokyo JAERI Ioffe Inst TRINITI KBSI KAIST ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching U Quebec NSTX Electron Bernstein Wave (EBW) Research Gary Taylor Princeton University P.C. Efthimion, C. Kessel, J.R. Wilson Princeton University G.L. Bell, T.S. Bigelow, M.D. Carter, D.A. Rasmussen, J.B. Wilgen Oak Ridge National Laboratory T. Peebles, S. Kubota University of California Los Angeles A.K. Ram, A. Bers, R. Temkin Massachusetts Institute of Technology R.W. Harvey, A.P. Smirnov CompX 45 th Annual Meeting of Division of Plasma Physics American Physical Society October 27 – 31, 2003 Albuquerque, New Mexico

2 of 8 NSTX Electron Bernstein Wave Research - Taylor At High  EBW Current Drive May Provide Critical Off-Axis Current ~100 kA of off-axis EBW CD needed for sustained  ~ 40% operation: - challenge on ST due to large trapped particle fraction [C. Kessel, KO1.009, next talk] NSTX,  = 40% EBW heating & CD may also assist non-solenoid plasma startup Mode-converted thermal EBW emission used to measure T e (R) and investigate coupling of EBW to electromagnetic waves Modeling EBW coupling, power deposition and CD efficiency for planned multi-megawatt EBW heating & CD system for NSTX

3 of 8 NSTX Electron Bernstein Wave Research - Taylor X-Mode & O-Mode EBW Antennas Installed on NSTX for T e (R) Diagnostic & EBW Coupling Studies B-X Antenna Has adjustable limiters designed to achieve > 80% EBW coupling: - similar antenna achieved ~ 100% coupling on CDX-U Adjustable Limiters Antennas B-X-O Antenna Uses obliquely viewing, stepped wedge: - also planning obliquely viewing, quad-ridged antenna

4 of 8 NSTX Electron Bernstein Wave Research - Taylor Oblique, "O-X-B", Launch Appears Resilient to Changes in Edge Density Gradient Optimum n // ~ 0.55; toroidal angle ~ 34 o from normal to B Maxiumum EBW coupling efficiency obtained for near- circular polarization EBW Coupling (%) OPTPOL/GLOSI Frequency = 14 GHz OPTIPOL surveys EBW coupling - uses impedance matrix from GLOSI

5 of 8 NSTX Electron Bernstein Wave Research - Taylor Fokker-Planck Modeling Indicates Efficient, Off-Axis, EBW Current Drive at  = 40% CompX GENRAY/CQL3D 14 GHz NSTX,  = 40% Antenna Frequency = 14 GHz EBW Power = 3 MW Total Driven Current =132 kA

6 of 8 NSTX Electron Bernstein Wave Research - Taylor Normalized Off-Axis CD Efficiency,  ec, in ST Compares Favorably to ECCD in Conventional Tokamak  CD Efficiency (kA/MW)  ec 20% % % Results for EBW Frequency = 14 GHz  ec = 3.27 x I p (A) x R(m) x n e (10 19 m -3 ) T e (keV) x P(W)  ec compares favorably to  off-axis, ECCD on D-IIID where  ec ~ 0.2 at  ~ 0.3, with  ec falling with increasing  CompX GENRAY/CQL3D [C.C. Petty, AIP Proc. 595, 275 (2001)]

7 of 8 NSTX Electron Bernstein Wave Research - Taylor Strong Diffusion Near Trapped-Passing Boundary Enables Efficient Ohkawa Current Drive CompX GENRAY/CQL3D NSTX,  = 40%

8 of 8 NSTX Electron Bernstein Wave Research - Taylor EBW Current Drive Possibly Critical to Sustained High  ST Operation New EBW emission antennas installed in NSTX for T e (R) and coupling studies in 2004: - Demonstrate > 80% EBW coupling Oblique, near-circularly polarized, launcher for efficient EBW coupling; resilient to changes in edge density gradient & field pitch Strong diffusion near trapped-passing boundary enables efficient off-axis, Ohkawa EBW CD in  ~ 40% plasmas ~ 3 MW EBW system planned to provide ~100kA off-axis EBW CD at  ~ 40% on NSTX by 2008: - ~ 4 MW of RF source power - steerable mirror launchers with polarization control CompX GENRAY/CQL3D