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Enhancing HHFW H-Mode Plasma: Goals, Achievements, and Future Directions

This document outlines the objectives and progress of the HHFW (High-Harmonic Fast Wave) H-mode plasma experiments. The primary goals include reproducing HHFW H-mode plasmas and expanding the operational range to achieve plasma currents (Ip) of 0.4-1.0 MA and magnetic fields (BT) of 0.35-0.6 T, focusing on medium to high density. Documented findings aim to support long pulse operations and the integration of HFW with NBI (Neutral Beam Injection). Key diagnostics and anticipated deliverables are discussed to ensure effective plasma characterization and stability analysis for improved performance in fusion experiments.

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Enhancing HHFW H-Mode Plasma: Goals, Achievements, and Future Directions

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  1. HHFW Driven H Mode Revisited B.P. LeBlanc and the usual suspects HHFW/EBW ET 14-Jan-2004

  2. Goals • Reproduce HHFW H-mode plasmas • Expand operational range • So far achieved: • Ip ≈ 0.4 - 0.5 MA, BT≈ 0.37 - 0.45 T, low density, LSN • New range sought: • Ip ≈ 0.4 - 1.0 MA, BT≈ 0.35 - 0.6 T, medium to high density, preferably DND • Document HHFW H-mode plasmas • Produce useful plasma for long pulse operation and HFW + NBI operation

  3. Reproduce HHFW H-mode Plasmas • Initial plasma • Use DND developed during HHFW conditioning, • Or, start with 109759 LSN and moves toward DND

  4. Expand Experimental Range • Need go to go high Ip, ≥ 1.0 MA, since want this plasma to be eventual NBI target • Want tall DND, which probably needs high Ip anyway • 0.35 - 0.6 T, but likely limited to 0.45 T for a while • Obtain high density without interfering with RF • Investigate high field side fueling • Supersonic gas injector • K// = 14m-1, then 7 m-1.

  5. Document Plasma • CHERS with NBI 10-ms blips, every ≥ 0.05 s • Edge rotation diagnostic, ERD • vf and vq, for carbon impurity, get Er • MPTS, Ha, SXR, Neutrons • UCLA reflectometer in fluctuation mode • ORNL reflectometer ? • Gas puff imaging, GPI • X-point tangential view • UCSD fast probe ? • Ha cameras, x-point and center stack midplane

  6. Anticipated Deliverables • HHFW H-mode plasmas • Success if ≥ 100 kJ • DND HHFW H-mode plasmas suitable for NBI into HHFW H-mode experiments • Target for long duration HHFW plasma operation (J.R. Wilson) • Transport analysis (TRANSP, CURRAY) • m-stability analysis • ITERPby(2) H-mode scaling • Another case study for electron transport

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