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XP 540: Transport of Fast Ions by Fishbones and TAEs

XP 540: Transport of Fast Ions by Fishbones and TAEs. Motivation: Exploit new diagnostic capabilities to achieve a quantitative understanding of fast-ion transport. Experimental Goal: Strong fishbone & TAE instabilities Fast-ion profiles Fluctuation profiles. Why fishbones?.

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XP 540: Transport of Fast Ions by Fishbones and TAEs

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  1. XP 540: Transport of Fast Ions by Fishbones and TAEs Motivation: Exploit new diagnostic capabilities to achieve a quantitative understanding of fast-ion transport. Experimental Goal: Strong fishbone & TAE instabilities Fast-ion profiles Fluctuation profiles

  2. Why fishbones? • Reproducible large neutron drops • Condition compatible with key diagnostics • Extensively studied in conventional tokamaks

  3. Why TAEs? • Need to understand fast-ion transport by TAEs for ITER. (Published comparisons with theory disagree.) • Efficient to study in same experiment (XP 449 had both fishbones and TAEs. • Also a good discharge for 3-wave coupling between fishbones and TAEs.

  4. Crucial Diagnostics • SSNPA • EllB NPA • Soft x-ray • Reflectometer  L-mode

  5. XP 449 Provides an Excellent Target for this Integrated Experiment • “Effect of ion cyclotron acceleration on rapidly chirping beam-driven instabilities in NSTX” by Heidbrink et al. • TAE eigenfunction measurements in Fredrickson’s APS and IAEA Technical Meeting papers. • Three-wave coupling paper by Crocker et al.

  6. Diagnose Fast-ion Phase Space with SSNPA (Deyong Liu)

  7. Experimental Run Plan • Establish target: (2-8 shots) #113534 (4.5 kG, 0.8 MA, Source C at 90 keV, inner wall limiter, helium). • If the fishbones are weak, add Source B at the time of interest or lower the plasma current or lower the toroidal field. • Document—NPA spatial scan (4 shots). • Repeat with Source A (4 shots). • Adjust discharge for strong TAEs (if not already acquired). • Lower the beam voltage to 65 keV from the reference condition (4 shots). • Options if time permits: seek stronger 3-wave coupling condition, lower toroidal field, or lower current.

  8. Fishbone / TAEAnalysis Plan • Transp with ad hoc transport models—match to neutron & neutral particle data • Models of MHD eigenfunction—match to fluctuation data • ORBIT code: calculate fast-ion transport in model fields.

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