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Title: Short-interval multi-laser Thomson scattering measurements of hydrogen pellet ablation in LHD

Thomson scattering forms an important aspect of measuring the electron density and temperature profiles of plasmas. In this study, we demonstrate Thomson scattering measurements obtained over a short interval (<1 ms) by using an event triggering system with a multi-laser configuration. We attempt to use our system to obtain the electron temperature and density profiles before and immediately after pellet injection into the large helical device. The obtained profiles exhibit dramatic changes after pellet injection as per our shot-by-shot measurements. We believe that this measurement technique will contribute towards a better understanding of the physics of the pellet deposition.
Authors:
; ; ; ;  [1]
  1. National Institute for Fusion Science, 322–6 Oroshi-cho, Toki 509–5292 (Japan)
Publication Date:
OSTI Identifier:
22308610
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABLATION; DEPOSITION; ELECTRON DENSITY; ELECTRON TEMPERATURE; HYDROGEN; LASERS; LHD DEVICE; PELLET INJECTION; PLASMA RADIAL PROFILES; THOMSON SCATTERING