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MSE Progress S. D. Scott and Howard Yuh October 28, 2002

MSE Progress S. D. Scott and Howard Yuh October 28, 2002. Mselog Data acquisition issues DNB performance MSE dataset Shot-to-shot variation Issue at moderate and high density – density scan Sawtooth. I hope to show a slide like the following at the DoE review:. Measured q from edge

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MSE Progress S. D. Scott and Howard Yuh October 28, 2002

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  1. MSE ProgressS. D. Scott and Howard YuhOctober 28, 2002 • Mselog • Data acquisition issues • DNB performance • MSE dataset • Shot-to-shot variation • Issue at moderate and high density – density scan • Sawtooth

  2. I hope to show a slide like the following at the DoE review: Measured q from edge channel or measured Pitch-angle 3 6 Edge Qpsi from Efit

  3. We have acquired a large MSE dataset: qpsi = 2.8-7.6 (about 600 points)

  4. Data includes considerable high-density operation

  5. Range of Q for Nel<0.8 is more limited butstill covers a range of 2+ in edge q

  6. No long-term trend in DNB performance

  7. DNB October Data: considerable day-to-day variation

  8. Also day-to-day scatter in MAX dnb current:

  9. Ratio, avg to maximum in Oct:

  10. Possible problems with q-measurementat high density? – individual shots Nel4 Series 4 0.46-0.58 Series 11 0.65-0.85 Series 18 1.01-1.10 Run day = 1021017 Series 4: 29, 30, 32 Series 11: 20, 21, 28 Series 18: 22, 26, 27

  11. Possible problems with q-measurementat high density? Nel4 Series 4 0.46-0.58 Series 11 0.65-0.85 Series 18 1.01-1.10 Run day = 1021017 Series 4: 29, 30, 32 Series 11: 20, 21, 28 Series 18: 22, 26, 27

  12. Shot-to-Shot Scatter in Pitch-Angle increases with density (linear scale)

  13. Comparison of shot-to-shot scatterin low-density plasmas: recent data versus August 9

  14. Apparent Pitch-angle changes at Onset of Sawteeth • Data from October 18, 2002 • Before and after onset of sawteeth • 50 ms integration period • Error bars shown are +1 sigma and • -1 sigma, where sigma is equal to the • shot-to-shot variation.

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