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N Seeding at High Triangularity and Low q95 Report about spectroscopy of #62565

Observation of CN molecules in nitrogen seeded plasmas S. Brezinsek, A. Meigs, A. Pospieszczyk, M. Stamp, J. Rapp. N Seeding at High Triangularity and Low q95 Report about spectroscopy of #62565. N 2 blow. GIM10. GIM11. Original aim: Test of spectrometer set-up for H-C measurements

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N Seeding at High Triangularity and Low q95 Report about spectroscopy of #62565

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  1. Observation of CN molecules in nitrogen seeded plasmasS. Brezinsek, A. Meigs, A. Pospieszczyk, M. Stamp, J. Rapp N Seeding at High Triangularity and Low q95 Report about spectroscopy of #62565 N2 blow GIM10 GIM11 Original aim: Test of spectrometer set-up for H-C measurements fortunate: GIM 11 -> GIM 10

  2. Spectral regions and line of sights GIM10 Spectral region around 391 nm with KT3A – very good choice

  3. Spatial & temporal discriminations for N+ N+ appears during N2 blow and mainly near separatrix

  4. Spectral ranges for nitrogen and its molecular compounds Overlap with CD (A-X)

  5. N2+ spectroscopy on TEXTOR TEXTOR: N2+ spectra could be well identified (gas blow) JET: None of these could be found so far

  6. Appearance of CN during N2 blow 2 spectra at different times difference spectrum (larger view)CN bands appear only directly at the wallnitrogen and oxygen remain also on inner viewing lines

  7. Spatial & temporal discrimination for CN CN appears during N2 blow and near the wall only

  8. Results & questions Only CN and N+could be found No traces of N2+ and N2+ in the high resolution wavelength bands No specific effects on C or hydrocarbons so far (might appear with higher blow rates) _________________________________________________________ Will the CN be formed in the bulk and released by (chemical) sputtering? Formation of DCN or does it come from DCN? Is the N codeposited? What happens to the CN ? Are there beneficial effects from CN formation -> removal of C-layers

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