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Flow measurements in the scrape-off layer of Alcator C-Mod using impurity plumes
- Source :
- Journal of Nuclear Materials. :1167-1172
- Publication Year :
- 2003
- Publisher :
- Elsevier BV, 2003.
-
Abstract
- Accurate measurements of plasma flows in the scrape-off layer (SOL) are a necessary requirement for understanding the physics of tokamak edge plasmas. A system is being developed on Alcator C-Mod for inferring flows parallel (v 1 ) and perpendicular (v E×B ) to local magnetic field lines from impurity emission patterns ('plumes') generated by local gas injection. Carbon plumes are generated at variable location in the SOL by puffing deuterated ethylene gas (C 2 D 4 ) through the end of a reciprocating fast-scanning probe. Two intensified CCD cameras are used to record C -1 and C +2 emission patterns simultaneously from near-perpendicular views. Plumes are modeled using a Monte Carlo impurity transport code, from which values for the background flows may be extracted. The sensitivity of the plume structure is investigated for a number of code inputs, including radial electric field (E r ) and the neutral launch dynamics. Initial modeling results indicate discrepancies between values of v || and E r extracted from the plumes and measurements obtained from probe data.
Details
- ISSN :
- 00223115
- Database :
- OpenAIRE
- Journal :
- Journal of Nuclear Materials
- Accession number :
- edsair.doi...........afe3e28e5c9bd4dd8ecc4341a6c8570b