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Title: 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 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.
Authors:
;  [1] ;  [2] ; ; ; ; ;  [3]
  1. School of Physical Sciences and National Centre for Plasma Science and Technology, Dublin City University, Glasnevin, Dublin (Ireland)
  2. ITER Organisation, FST, Route de Vinon, CS 90 046, 13067 Saint Paul Lez Durance Cedex (France)
  3. CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom)
Publication Date:
OSTI Identifier:
22392274
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CARBON; DIVERTORS; ELECTRODES; EMISSION; MAST TOKAMAK; PLASMA IMPURITIES