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Calibrated helium and carbon ion flow measurements in the DIII-D divertor plasma
- Source :
- Nuclear Materials and Energy, Vol 19, Iss, Pp 137-142 (2019), Allen, S L, Samuell, C M, Meyer, W H, Jaervinen, A E, Porter, G D & Rognlien, T 2019, ' Calibrated helium and carbon ion flow measurements in the DIII-D divertor plasma ', Nuclear Materials and Energy, vol. 19, pp. 137-142 . https://doi.org/10.1016/j.nme.2018.12.015
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- To explore the influence of drifts on ion flows in the DIII-D divertor and Scrape-Off-Layer (SOL), a calibrated Coherence Imaging System (CIS) views the lower divertor. A new tuneable calibration laser and precision wavemeter provide the rest wavelength for CIII 465 nm plasma emissions resulting in ≤ 1 km/s uncertainty in ion velocities that are in the range of 30 km/s in the divertor plasma. The 2-D line-integrated velocity images have been tomographically inverted to obtain maps of ion velocity. Both He + and C 2 + ion velocity maps were measured in both directions of the toroidal magnetic field BT, and C 2 + images were obtained in attached and detached L- and H-mode plasmas. The measured C 2 + velocities are in the range of 20–30 km/s and are compared with UEDGE modeling with full drifts. While He II as a main ion is expected to be entrained in the plasma flow, the C 2 + impurity flow involves the competition between the frictional and ion temperature gradient forces. Both the CIS data and UEDGE modeling agree that the C 2 + flow is towards the divertor plates, but flips with the direction of BT. In general, the experimental C 2 + emission and flow profiles have a wider spatial extent than the UEDGE modeling.
- Subjects :
- Nuclear and High Energy Physics
Materials science
DIII-D
Materials Science (miscellaneous)
chemistry.chemical_element
Ion flow
01 natural sciences
010305 fluids & plasmas
Ion
Physics::Plasma Physics
0103 physical sciences
Coherence imaging
Helium
010302 applied physics
Toroid
Divertor and scrape off layer
Divertor
DIII-D tokamak
Plasma
lcsh:TK9001-9401
Magnetic field
Wavelength
Nuclear Energy and Engineering
chemistry
lcsh:Nuclear engineering. Atomic power
Atomic physics
Subjects
Details
- ISSN :
- 23521791
- Volume :
- 19
- Database :
- OpenAIRE
- Journal :
- Nuclear Materials and Energy
- Accession number :
- edsair.doi.dedup.....465c9257a3dc46271a21c616213464b9