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 NPA Measurement of the Anisotropic NB Energetic Ion Distribution and Beam Ion Profile on NSTX: XP-417 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 and A. L. Roquemore Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ USA NSTX 2004 Forum

2 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

NSTX 2004 Forum 3 The beam injected neutrals spatially localize the NPA signal insert). Approximately 2/3 of the line- integrated flux originates in the NB region. This spatial localization constrains the range of pitch angles viewed by the NPA (main panel). Spatial localization weakens with increasing NB penetration distance (due to attenuation of the beam neutrals). NPA Measurements are Spatially Localized by Beam Injected Neutrals

NSTX 2004 Forum 4 Slowing Down and Pitch Angle Scattering of NB Ions in NSTX Plasmas is Consistent with Classical Behavior Spectrum at 60 ms after start of NBI E perp distribution for E ≤ E crit (~15 keV) fills in over ~ 60 ms (classical time: ~ 50 ms) B C A t=140 ms

NSTX 2004 Forum 5 The NSTX NPA Can Scan 26 o Vertically Downward The elevation minor radius at the intersection of the NPA sightline with a given neutral beam line depends on the NPA midplane tangency radius. 26 o

NSTX 2004 Forum 6 NPA Vertical Scan Reveals the Beam Neutral Footprint Shown is the NPA measurement of the NB elevation profile versus beam energy and vertical scan angle obtained at R tan = 80 cm revealing the spatial distribution of the injected neutral beam Source A below the mid-plane.

NSTX 2004 Forum 7 Extensive Sets of Data Were Obtained on Additional Ion Behavior Topics Ion temperature measurements in Ohmic and NB-heated discharges: - vertical NPA scan for elevation T i (r) Ion Redistribution and/or loss of thermal and energetic ions due to reconnection events and sawteeth: - ion acceleration due to reconnection events Extension of measurements on MHD-induced energetic ion loss behavior: - scaling with NB injection energy - spatial (field pitch) localization of ion loss Energetic ion tail production during HHFW launch in NB heated discharges: - support of XP-449, “Suppression of Frequency Chirping by HHFW Heating of Beam Ions”

NSTX 2004 Forum 8 Comparable RF acceleration of neutral beam ions observed at E b ~ 65 keV and E b ~ 90 keV for all NB sources. The energetic ion tails form in < 15 ms for P HHFW ~ 2 MW. Tail decay time ~ 12 ms. Suppression of Frequency Chirping by HHFW Heating of Beam Ions: XP-449