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Summary of RF Work To Date

NSTX. Supported by. Summary of RF Work To Date. G. Taylor. NSTX Monday Physics Meeting June 21, 2010. RF Operations Summary - I. 5.5 days of RF operations in June On June 3 ran 2.5 hours RF vacuum conditioning in evening: Reached 19-21 kV on all sources

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Summary of RF Work To Date

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  1. NSTX Supported by Summary of RF Work To Date G. Taylor NSTX Monday Physics Meeting June 21, 2010

  2. RF Operations Summary - I • 5.5 days of RF operations in June • On June 3 ran 2.5 hours RF vacuum conditioning in evening: • Reached 19-21 kV on all sources • On June 7 ran XMP-26 with -90o phasing (kf=-8 m-1): • 2.2 MW for 200 ms into He OH plasma, shorter pulses up to 3 MW • 2.2 MW for 160 ms into D NBI H-mode plasma • On June 8 ran XMP-26 with kf=-8 m-1 & -150o phasing (kf=-13 m-1) • Started with 1 hour of vacuum conditioning, reached 19-21 kV on all sources • 2.2 MW of kf=-8 m-1 for 200 ms into He OH plasma, Te(0) = 3 keV • 1.4 MW of kf=-8 m-1 for 200 ms into D NBI H-mode • 0.9 MW of kf=-13 m-1 for 80 ms in D NBI H-mode • 1.5 run days (1 day SFSU & 0.5 days WPI)

  3. RF Operations Summary - II • June 9 ran XMP-26 at kf=-8 m-1: • 2.1 MW of kf=-8 m-1 for 200 ms into D NBI H-mode (Also 2.7 MW for 100 ms & 2.9 MW for 50 ms) • Completed 4 shots of XP-1017 “RF Divertor Heating”, ran at 4.5 and 5.5 kG • June 11 ran 2 hrs of XMP-26, mostly at kf=-13 m-1: • 2.1 MW of kf=-8 m-1 for 160 ms into D NBI H-mode • 1.1 MW of kf=-13 m-1 for 130 ms into D NBI H-mode • June 14 ran XMP-26, mostly at 180o phasing (kf= 14 m-1 + 18 m-1), kf=-13 m-1, and kf=-8 m-1: • Struggled to couple 0.4 MW at kf= 14 m-1 + 18 m-1 into D NBI H-mode • 1.6 MW of kf=-13 m-1 for 170 ms into D NBI H-mode • Ran Ip = 300 kA plasmas for XP-1009 at the end of the day and got good heating and H-mode with 1.4 MW of kf=-8 m-1 for 200 ms

  4. Best RF Pulse Obtained with kf = -8 m-1 Heating on June 9

  5. Large Increase in Te(0) & Pe(0) with 1.4 MW of kf=-8 m-1 heating of Ip= 300 kA Deuterium Plasma

  6. RF Operations Summary - III • June 17 ran XMP-26 at kf=-8 m-1: • 1.4 MW for only 170 ms into D NBI H-mode • Lots of trips when we tried to run above 1.4 MW into D NBI H-mode • Ran a few shots of XP-1017 “RF Divertor Heating” at 4.5 and 5.5 kG • June 18 ran 3 hours of vacuum conditioning: • Antenna was badly de-conditioned • Took 3 hours to reach 14-15 kV on all sources • Large increase in pressure during conditioning

  7. Divertor Heating vs Magnetic Field Pitch B=5.5 kG, Ip=0.8 MA B=4.5 kG, I=0.8 MA B=4.5 kG, Ip=0.9 MA B=4.5 kG, Ip=1.0 MA

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