N Seeding at High Triangularity and Low q95 Report about spectroscopy of #62565
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Transcript of N Seeding at High Triangularity and Low q95 Report about spectroscopy of #62565
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Trilateral Euregio Cluster
Observation of CN molecules in nitrogen seeded plasmasS. Brezinsek, A. Meigs, A. Pospieszczyk, M. Stamp,
J. Rapp
N Seeding at High Triangularity and Low q95Report about spectroscopy of #62565
Original aim: Test of spectrometer set-up for H-C measurements
fortunate: GIM 11 -> GIM 10
GIM11
GIM10
N2 blow
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Trilateral Euregio Cluster
Spectral regions and line of sights
Spectral region around 391 nm with KT3A – very good choice
GIM10
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Trilateral Euregio Cluster
Spatial & temporal discriminations for N+
N+ appears during N2 blow and mainly near separatrix
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Trilateral Euregio Cluster
Spectral ranges for nitrogen and its molecular compounds
Overlap with CD (A-X)
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Trilateral Euregio Cluster
N2+ spectroscopy on TEXTOR
TEXTOR: N2+ spectra could be well identified (gas blow)
JET: None of these could be found so far
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Trilateral Euregio Cluster
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
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Trilateral Euregio Cluster
Spatial & temporal discrimination for CN
CN appears during N2 blow and near the wall only
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Trilateral Euregio Cluster
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)
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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