This title appears in the Scientific Report :
2006
Please use the identifier:
http://hdl.handle.net/2128/1891 in citations.
Please use the identifier: http://dx.doi.org/10.1088/0741-3335/48/8/009 in citations.
Spectroscopic measurement of molecular deuterium fluxes in the DIII-D edge
Spectroscopic measurement of molecular deuterium fluxes in the DIII-D edge
Molecular deuterium fluxes into the edge of deuterium-fuelled L-mode discharges are measured using passive visible spectroscopy of D-2 emission lines. Comparison with the atomic deuterium influx measured using D-alpha emission suggests that a significant fraction of the plasma edge fuelling from the...
Saved in:
Personal Name(s): | Hollmann, E. M. |
---|---|
Brezinsek, S. / Brooks, N. H. / Groth, M. / McLean, A. G. / Pigarov, A. Yu. / Rudakov, D. L. | |
Contributing Institute: |
Institut für Plasmaphysik; IPP |
Published in: | Plasma physics and controlled fusion, 48 (2006) S. 1165 - 1180 |
Imprint: |
Bristol
IOP Publ.
2006
|
Physical Description: |
1165 - 1180 |
DOI: |
10.1088/0741-3335/48/8/009 |
Document Type: |
Journal Article |
Research Program: |
Fusion |
Series Title: |
Plasma Physics and Controlled Fusion
48 |
Subject (ZB): | |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1088/0741-3335/48/8/009 in citations.
Molecular deuterium fluxes into the edge of deuterium-fuelled L-mode discharges are measured using passive visible spectroscopy of D-2 emission lines. Comparison with the atomic deuterium influx measured using D-alpha emission suggests that a significant fraction of the plasma edge fuelling from the walls is in the form of D-2. molecular deuterium flux is observed in both the divertor and main chamber regions but is roughly a factor 100 smaller near the inner main chamber wall and roughly a factor 1000 smaller near the outer main chamber wall, when compared with the divertor region. Very high levels of molecular D-2 excitation are measured, with ground state D-2 rotational population temperatures T-rot up to 10000K and vibrational population temperatures T-vib up to 30000 K. Comparisons between rotational population temperatures and the local electron density suggest that T-rot can be used as a reasonably good indicator of electron density in the D-2 line emission region. In recombining, detached divertor operation, estimates of the enhanced volume recombination rate due to the presence of vibrationally-excited D-2 suggest that the effect of molecular-assisted volume recombination could be comparable in magnitude to that of normal D+ volume recombination (EIR). |