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Title: Combined hydrogen and lithium beam emission spectroscopy observation system for Korea Superconducting Tokamak Advanced Research

A novel beam emission spectroscopy observation system was designed, built, and installed onto the Korea Superconducting Tokamak Advanced Research tokamak. The system is designed in a way to be capable of measuring beam emission either from a heating deuterium or from a diagnostic lithium beam. The two beams have somewhat complementary capabilities: edge density profile and turbulence measurement with the lithium beam and two dimensional turbulence measurement with the heating beam. Two detectors can be used in parallel: a CMOS camera provides overview of the scene and lithium beam light intensity distribution at maximum few hundred Hz frame rate, while a 4 × 16 pixel avalanche photo-diode (APD) camera gives 500 kHz bandwidth data from a 4 cm × 16 cm region. The optics use direct imaging through lenses and mirrors from the observation window to the detectors, thus avoid the use of costly and inflexible fiber guides. Remotely controlled mechanisms allow adjustment of the APD camera’s measurement location on a shot-to-shot basis, while temperature stabilized filter holders provide selection of either the Doppler shifted deuterium alpha or lithium resonance line. The capabilities of the system are illustrated by measurements of basic plasma turbulence properties.
Authors:
 [1] ;  [2] ; ; ;  [1] ; ;  [3] ; ; ;  [4] ;  [5]
  1. Wigner RCP, Euratom Association-HAS, Budapest (Hungary)
  2. (Hungary)
  3. Department of Atomic Physics, BME IOP, Budapest (Hungary)
  4. BME NTI, Budapest (Hungary)
  5. National Fusion Research Institute, Daejeon (Korea, Republic of)
Publication Date:
OSTI Identifier:
22483262
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 7; Other Information: (c) 2015 EURATOM; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; DEUTERIUM; EMISSION SPECTROSCOPY; HYDROGEN; KHZ RANGE 100-1000; LENSES; LITHIUM; MIRRORS; OPTICS; PHOTODIODES; TOKAMAK DEVICES