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Title: Performance of JT-60SA divertor Thomson scattering diagnostics

For the satellite tokamak JT-60 Super Advanced (JT-60SA), a divertor Thomson scattering measurement system is planning to be installed. In this study, we improved the design of the collection optics based on the previous one, in which it was found that the solid angle of the collection optics became very small, mainly because of poor accessibility to the measurement region. By improvement, the solid angle was increased by up to approximately five times. To accurately assess the measurement performance, background noise was assessed using the plasma parameters in two typical discharges in JT-60SA calculated from the SONIC code. Moreover, the influence of the reflection of bremsstrahlung radiation by the wall is simulated by using a ray tracing simulation. The errors in the temperature and the density are assessed based on the simulation results for three typical field of views.
Authors:
 [1] ; ; ; ; ;  [2] ;  [3]
  1. Nagoya University, Nagoya 464-8603 (Japan)
  2. Japan Atomic Energy Agency, Naka, Ibaraki 801-1 (Japan)
  3. Genesia Co., Mitaka, Tokyo 181-0013 (Japan)
Publication Date:
OSTI Identifier:
22482741
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 8; Other Information: (c) 2015 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; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BACKGROUND NOISE; BREMSSTRAHLUNG; DIVERTORS; JT-60 TOKAMAK; PERFORMANCE; REFLECTION; SIMULATION; THOMSON SCATTERING