Wide-angle ITER-prototype tangential infrared and visible viewing system for DIII-D
Abstract
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:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Arizona, Tucson, AZ (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1352913
- Grant/Contract Number:
- FC02-04ER54698
- Resource 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)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Citation Formats
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., 2014.
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. https://doi.org/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. Tue .
"Wide-angle ITER-prototype tangential infrared and visible viewing system for DIII-D". United States. https://doi.org/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 = {Tue Aug 26 00:00:00 EDT 2014},
month = {Tue Aug 26 00:00:00 EDT 2014}
}
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Works referenced in this record:
Modified Visible and Infrared Optical Design for the ITER Upper Ports
report, April 2008
- Lasnier, C.; Seppala, L.; Morris, K.
Energy flux to the ASDEX-Upgrade diverter plates determined by thermography and calorimetry
journal, January 1995
- Herrmann, A.; Junker, W.; Gunther, K.
- Plasma Physics and Controlled Fusion, Vol. 37, Issue 1
Works referencing / citing this record:
Thermal quench mitigation and current quench control by injection of mixed species shattered pellets in DIII-D
journal, June 2016
- Shiraki, D.; Commaux, N.; Baylor, L. R.
- Physics of Plasmas, Vol. 23, Issue 6
Verification of Doppler coherence imaging for 2D ion velocity measurements on DIII-D
journal, September 2018
- Samuell, C. M.; Allen, S. L.; Meyer, W. H.
- Review of Scientific Instruments, Vol. 89, Issue 9
Injection of multiple shattered pellets for disruption mitigation in DIII-D
journal, September 2019
- Herfindal, J. L.; Shiraki, D.; Baylor, L. R.
- Nuclear Fusion, Vol. 59, Issue 10