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High-Resolution EUV Measurements on NSTX: Emission Spectra Analysis

This project focuses on high-resolution EUV measurements on NSTX, analyzing plasma emission spectra, particularly the presence of nitrogen and other impurities. The data reveals novel line ratios, potential charge exchange evidence, and calibration insights.

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High-Resolution EUV Measurements on NSTX: Emission Spectra Analysis

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  1. High-Resolution Measurements in the EUV on NSTX Peter Beiersdorfer LLNL Manfred Bitter PPPL Lane Roquemore PPPL Jaan Lepson UC Berkeley Ming-Feng Gu Stanford University Steve Kahn Stanford University DPP- Oct 25, 2005

  2. Stellar plasma emission spectra

  3. Stellar Flare Plasma Project:We installed a new grating spectrometer on NSTX

  4. Spectral image of CCD camera from new grating spectrometer

  5. Spectral lineout shows the intrinsic impurities What about nitrogen? Nitrogen is hardly ever seen!

  6. Some shots have nitrogen July 14, 2005 Nitrogen seen in shots 117087, 117113 August 17, 2005 Nitrogen seen in shot 117786 (strong He puff, LPI) August 23, 2005 Nitrogen seen in all RF shots

  7. August 23 2005 HHFW CD shots had most diverse impurities

  8. August 23 2005 HHFW CD shots had most diverse impurities

  9. A detailed analysis of the "iron" data shows that some of the emission is from nickel

  10. NSTX measurements agree very well with data from stellar coronae

  11. NBI-heated discharges produce novel line ratios – evidence for charge exchange?

  12. Non-intrinsic impurities: Argon injection Subsequent argon injection runs were essentially invisible

  13. Calibration of density-sensitive line ratios

  14. Outlook

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