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.

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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 Ioffe Inst TRINITI KBSI KAIST ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching U Quebec Investigation of Collective Fast-ion Redistribution or Loss in NSTX 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 S. S. Medley, D. S. Darrow, E. D. Fredrickson, J. Menard and the NSTX Team Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ USA IAEA 2006 Poster Outline PPPL August 7, 2006

2 Categories of MHD-induced Redistribution/Loss of Energetic Ions Magnitude of the MHD-induced redistribution/loss has been based almost entirely on volume-integrated neutron yield measurements.

3 Investigation of Collective Fast-ion Redistribution or Loss in NSTX: Poster Outline Interpretation of S npa (E, t, R tan ) NPA measurements (3 Vg): - ‘line-integrated’ measurements are significantly localized by CX on NB primary and halo neutrals (space and field pitch) - outer gap (plasma volume) excursions,  gap, give false loss signals - CX production/attenuation (emissivity) is co-mingled with MHD-induced loss Interpretation of S n (t) volume-averaged neutron rate (1 Vg): - S n (t) affected by  gap (t), Z eff (r,t), edge neutral density Interpretation of sFLIP measurements (1 Vg + movie) Procedure to correct NPA measurements for emissivity effects (1 Vg): - TRANSP NPA simulation and halo neutral computational issue Anomalous fast ion diffusion (AFID) model in TRANSP(1 Vg): - space, time and energy selection criteria for matching S n (t), S npa (E, t, R tan ) Results for different categories of MHD-induced redistribution /loss: - bursting activity - Fredrickson (2 Vg) - continuous MHD mode - ala Menard using (3 Vg) - continuous EPM/TAE activity - ? (3 Vg)

4 Backup

5 The Neutral Particle Analyzer (NPA) on NSTX Scans Horizontally Over a Wide Range of Tangency Angles on a Shot-to-Shot Basis Covers Thermal ( keV) and Energetic Ion (≤ 150 keV) Ranges

6 Overview of Diagnostics for Evaluation of MHD-induced Energetic Ion Redistribution/Loss Both the volume-averaged S n (t) and line-averaged S npa (E, t, R ta ) show MHD-induced fast ion depletion, but cannot distinguish between redistribution and loss effects. Mirnov, USXR, FireTip…characterize MHD activity (mode, amplitude, localization) S n (t)…volume-averaged neutron rate S npa (E, t, R tan )…line-integrated charge exchange neutral efflux sFLIP Imaging (Darrow)…identifies energetic ion loss to the outer wall MSE (Levinton) + LRDFIT (Menard)…identifies redistribution because outward displacement of the core-peaked energetic beam ions modifies the beam-driven current profile and hence the core q-profile [1] [1] “Observation of Instability-induced Current Redistribution in a Spherical Torus Experiment,” J. E. Menard, et al. PPPL-4160 (May, 2006). Submitted to PRL

7 Dominance of charge exchange emissivity by beam neutrals results in both field pitch and spatial localization of NPA measurements. NPA Measurements are Localized in Pitch and Space by Beam Injected Neutrals

8 Depletion of the NPA Energetic Ion Spectra Exhibits a Spatial Dependence The left panels show spectra at various R tan preceeding (t = 200 ms) and following (t = 380 ms) H-mode onset. The right panel shows the spatial dependence of the depletion at E = 60 keV.

9 D. Darrow is preparing an sFLIP image overlay to quantify gyroradius centroid (energy) and pitch angle of the energetic ion loss. New Tool Enables Correlation of Energetic Ion Flux with sFLIP and Mirnov Data

10 SN Waveforms I p =0.75 MA, B T =4.5 kG, keV, keV S npa depletion during n e rise (t = s) is due to combined effects of CX emissivity & Alfvén instabilities. TOI for TRANSP analysis is t = s during an n=1, f<10 kHz kink- type MHD mode.

11 TRANSP Anomalous Fast Ion Diffusion (AFID) Model I p =0.75 MA, B T =4.5 kG, keV, keV

12 Summary Data mining for fast ion loss effects is complete for 2005 and in progress for MSE/LRDFIT and sFLIP are being utilized to distinguish between energetic ion redistribution and loss effects, respectively. Both CX emissivity and MHD instability effects contribute to depletion of the S npa. Volume averaging of NB halo neutrals in TRANSP compromises analysis to separate the CX emissivity and MHD instability effects. R. Akers is applying the LOCUST code (that has proper halo neutral modeling) to quantify the effect of halo neutrals on S npa amplitude and time evolution. If halo neutrals affect the evolution of S npa, progress in the investigation reported here will be severely impacted: options are to upgrade TRANSP or import LOCUST, both requiring ~ MY of manpower.