Divertor impurity injection using high voltage arcs for impurity transport studies on the Mega Amp Spherical Tokamak

The operation of next-generation fusion reactors will be significantly affected by impurity transport in the scrape-off layer (SOL). Current modelling efforts are restricted by a lack of detailed data on impurity transport in the SOL. In order to address this, a carbon injector has been designed and...

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Bibliographic Details
Published in:Review of scientific instruments 2014-12, Vol.85 (12), p.123503-123503
Main Authors: Leggate, H J, Lisgo, S W, Harrison, J R, Elmore, S, Allan, S Y, Gaffka, R C, Stephen, R C, Turner, M M
Format: Article
Language:English
Subjects:
Capacitor banks
CARBON
DIVERTORS
Electric arcs
Electric potential
ELECTRODES
EMISSION
Fusion reactors
High voltages
Impurities
Injectors
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
MAST TOKAMAK
PLASMA IMPURITIES
Scientific apparatus & instruments
Tokamak devices
Transport
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Summary:The operation of next-generation fusion reactors will be significantly affected by impurity transport in the scrape-off layer (SOL). Current modelling efforts are restricted by a lack of detailed data on impurity transport in the SOL. In order to address this, a carbon injector has been designed and installed on the Mega Amp Spherical Tokamak (MAST). The injector creates short lived carbon plumes originating at the MAST divertor lasting less than 50 μs. High voltage capacitor banks are used to create a discharge across concentric carbon electrodes located in a probe mounted on the Divertor Science Facility in the MAST lower divertor. This results in a very short plume duration allowing observation of the evolution of the plume and precise localisation of the plume relative to the X-point on MAST. The emission from the carbon plume was imaged using fast visible cameras filtered in order to isolate the carbon II and carbon III emission lines centered around 514 nm and 465 nm.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4903352