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Exploring Power Deposition in HHFW: Key Findings and Future Directions

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deva
7 diapositives · 188 Views · Oct 03, 2014

This document outlines findings from the HHFW group meeting held on December 16, 2003, led by David Swain, Dan Stutman, and Randy Wilson. It addresses critical issues regarding power deposition in electron heating, including how RF parameters and plasma conditions influence energy deposition, efficiency, and modulation techniques. It also discusses measurements from past experiments, future experiments planned for power modulation, and methods for diagnostics to enhance understanding of heating dynamics in plasma. This summary provides insights for ongoing research and experimental design.

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Exploring Power Deposition in HHFW: Key Findings and Future Directions
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  1. XP-310 – Electron Heating with HHFW David Swain, Dan Stutman, Randy Wilson and the usual suspects HHFW Group Meeting Dec 16, 2003

  2. Power Deposition XP • Issues: • Where is the power deposited? • How does it change as rf parameters (e.g., phasing) are changed? • How does it change as plasma parameters (e.g., ne, Ip) are changed? • Efficiency? How much winds up in the core? • Technique: • Modulate rf, look at changes in Te, ne, Prad,... with modulation • Brief trial run done in 2003, saw very small change in Te • Shot 110016, CD, 500 kA, 4.5 T, He, LSN • Square-wave modulation of rf 50%, 10-ms period • Low-energy USXR detectors saw modulation in outer 1/2 of plasma, probably density or impurity modulation • Modulation of Te(0) ≤ 1%

  3. Generic modulation experiment setup • P = 2 – 3 MW (want reproducible shots) • Modulate rf: ~50% square-wave with ~10-ms period (need to check; try 20 and 30-ms periods also) • Diagnostics: • Need USXR set for full spectrum measurements (from Stutman): • Bay J Top, E > 0.4 keV, • Bay G Top, H_up, H-down E > 1.4 keV for tomography • Bay G_bottom E =0.3 keV / bolometry, for C influx. • FIRETiP data as much as possible (how many channels, what’s time resolution?) • Bolometry, impurity lines,.... • Thomson scattering • Ion temperature measurements: • How necessary are they? • Argon Ti? • Beam blip?

  4. Plasma conditions to try • Would like to try as many of these as possible in piggy-back mode before dedicated run day for modulation experiments. Want to see HHFW shot where Te appears to equilibrate after PRF is applied. • Heating case: • High Ip (≥ 800 kA), LSN (DN?) • 0π0π0π , 00ππ00, or CD phasing • Density: medium? • CD case: • Low Ip (≤ 500 kA), CD phasing • Beam-heated case: • ≥ 800 kA, LSN? • Try w. C source (≈ 1.5 MW) early to get good Te, quiescent (Stutman) • Other suggestions?

  5. Things probably NOT covered in this XP • Study of H-mode threshold or operation • For high power may be difficult to avoid • Run in He to avoid H-mode? • ITB formation • Run time for this XP is 1 day, plus 1 day later. • Don’t have time to study these topics, unless H-mode or ITB operation is established by other XP’s.

  6. Strawman run plan • First day (in Feb?) operation depends on results of piggy-back experiments • IF no good shots found, then may try: • Replicate 110016 • He, 0.45T, 500 kA, ~2e19, LSN • Phasing -90° • Try heating at higher current (sim. to 107873?) • He, 0.45T, 800 kA, ~2E19, LSN (shot was actually D2) • 0π0π0π phasing • With beams (107872?) • Add beam early

  7. Trying to make modulation experiments easier • New power and phase modulation widget developed: • RF amplitude with • finite ramp turn-on • two power levels • Phase with two levels • Power modulation: • “One-click” on/off • Easy adjustment of modulation frequency and amplitude, start and stop times Power, no modulation Power with modulation