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Title: Wide-angle ITER-prototype tangential infrared and visible viewing system for DIII-D

An imaging system with a wide-angle tangential view of the full poloidal cross-section of the tokamak in simultaneous infrared and visible light has been installed on DIII-D. The optical train includes three polished stainless steel mirrors in vacuum, which view the tokamak through an aperture in the first mirror, similar to the design concept proposed for ITER. A dichroic beam splitter outside the vacuum separates visible and infrared (IR) light. Spatial calibration is accomplished by warping a CAD-rendered image to align with landmarks in a data image. The IR camera provides scrape-off layer heat flux profile deposition features in diverted and inner-wall-limited plasmas, such as heat flux reduction in pumped radiative divertor shots. As a result, demonstration of the system to date includes observation of fast-ion losses to the outer wall during neutral beam injection, and shows reduced peak wall heat loading with disruption mitigation by injection of a massive gas puff.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Arizona, Tucson, AZ (United States)
  3. General Atomics, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 85; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1352913

Lasnier, Charles J., Allen, Steve L., Ellis, Ronald E., Fenstermacher, Max E., McLean, Adam G., Meyer, William H., Morris, K., Seppala, L. G., Crabtree, Karlton, and Van Zeeland, Michael A.. Wide-angle ITER-prototype tangential infrared and visible viewing system for DIII-D. United States: N. p., Web. doi:10.1063/1.4892897.
Lasnier, Charles J., Allen, Steve L., Ellis, Ronald E., Fenstermacher, Max E., McLean, Adam G., Meyer, William H., Morris, K., Seppala, L. G., Crabtree, Karlton, & Van Zeeland, Michael A.. Wide-angle ITER-prototype tangential infrared and visible viewing system for DIII-D. United States. doi:10.1063/1.4892897.
Lasnier, Charles J., Allen, Steve L., Ellis, Ronald E., Fenstermacher, Max E., McLean, Adam G., Meyer, William H., Morris, K., Seppala, L. G., Crabtree, Karlton, and Van Zeeland, Michael A.. 2014. "Wide-angle ITER-prototype tangential infrared and visible viewing system for DIII-D". United States. doi:10.1063/1.4892897. https://www.osti.gov/servlets/purl/1352913.
@article{osti_1352913,
title = {Wide-angle ITER-prototype tangential infrared and visible viewing system for DIII-D},
author = {Lasnier, Charles J. and Allen, Steve L. and Ellis, Ronald E. and Fenstermacher, Max E. and McLean, Adam G. and Meyer, William H. and Morris, K. and Seppala, L. G. and Crabtree, Karlton and Van Zeeland, Michael A.},
abstractNote = {An imaging system with a wide-angle tangential view of the full poloidal cross-section of the tokamak in simultaneous infrared and visible light has been installed on DIII-D. The optical train includes three polished stainless steel mirrors in vacuum, which view the tokamak through an aperture in the first mirror, similar to the design concept proposed for ITER. A dichroic beam splitter outside the vacuum separates visible and infrared (IR) light. Spatial calibration is accomplished by warping a CAD-rendered image to align with landmarks in a data image. The IR camera provides scrape-off layer heat flux profile deposition features in diverted and inner-wall-limited plasmas, such as heat flux reduction in pumped radiative divertor shots. As a result, demonstration of the system to date includes observation of fast-ion losses to the outer wall during neutral beam injection, and shows reduced peak wall heat loading with disruption mitigation by injection of a massive gas puff.},
doi = {10.1063/1.4892897},
journal = {Review of Scientific Instruments},
number = 11,
volume = 85,
place = {United States},
year = {2014},
month = {8}
}