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Fast Ion Profiles with the Solid State Neutral Particle Analyzer Diagnostic

Supported by. Fast Ion Profiles with the Solid State Neutral Particle Analyzer Diagnostic. 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

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Fast Ion Profiles with the Solid State Neutral Particle Analyzer Diagnostic

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  1. Supported by Fast Ion Profiles with the Solid State Neutral Particle Analyzer Diagnostic 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 D. Liu and W. W. Heidbrink University of California, Irvine, CA 92697 D. S. Darrow, S. S. Medley and A. L. Roquemore Princeton Plasma Physics Laboratory, Princeton, NJ 08543 NSTX 2006 Results Review

  2. SSNPA Measures Fast Ions that Charge Exchange with Injected Neutral Beams Δt~2ms, ΔE~10keV Energy range (35~110keV)

  3. Slowing Down of Beam Ions in MHD-quiescentPlasmas is Consistent with Classical Behavior

  4. Slowing Down of Beam Ions in MHD-quiescentPlasmas is Consistent with Classical Behavior (cont’d) The decay time of the neutrons also agrees with the classical theory.

  5. 40~50 keV 50~60 keV 60~70 keV 70~80 keV 80~90 keV 90~ 100 keV Case 1: All Four Chords are Depleted low Energy high

  6. Case 2: Inner Chords Decrease, Outer Chords Increase

  7. Case 2: Inner Chords Decrease, Outer Chords Increase (cont’d) At t=0.25~0.45s, Ch1 decreased, Ch3 higher energy channels and Ch4 Increased. 40~50 KeV 50~60 keV 60~70 keV 70~80 KeV 80~90 KeV 90~ 100KeV Shot 119900 Chord 1 Rtan=60cm Chord 4 Rtan=120cm Chord 3 Rtan=100cm

  8. Case 3: Some Channels are Correlated with Neutron Drops • Some channels of SSNPA are correlated with neutron drops and MHD activity. • The dips lead, bursts lag. • Larger effects on high energy channels.

  9. Summary • In MHD-quiescent Plasmas, fast ions behave classically. • Slowing down of full energy beam ions is observed and slowing down time is consistent with classical theory; • Neutron decay time also agrees with classical theory; • Plan to check pitch angle scattering. • In the presence of MHD activity: • Signals of some SSNPA channels are often correlated with neutron drops and MHD activity; • Several different types of SSNPA behavior are observed and not fully understood; • Plan to select typical cases and study the effects of MHD activity on fast ion distribution.

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