Improved edge charge exchange recombination spectroscopy in DIII-D
Abstract
The charge exchange recombination spectroscopy diagnostic on the DIII-D tokamak has been upgraded with the addition of more high radial resolution view chords near the edge of the plasma (r/a > 0.8). The additional views are diagnosed with the same number of spectrometers by placing fiber optics side-by-side at the spectrometer entrance with a precise separation that avoids wavelength shifted crosstalk without the use of bandpass filters. The new views improve measurement of edge impurity parameters in steep gradient, H-mode plasmas with many different shapes. The number of edge view chords with 8 mm radial separation has increased from 16 to 38. New fused silica fibers have improved light throughput and clarify the observation of non-Gaussian spectra that suggest the ion distribution function can be non-Maxwellian in low collisionality plasmas.
- Authors:
-
- Oak Ridge Associated Univ., Oak Ridge, TN (United States)
- General Atomics, San Diego, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- Contributing Org.:
- Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451, USA Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- OSTI Identifier:
- 1350535
- Alternate Identifier(s):
- OSTI ID: 1287042; OSTI ID: 1372083
- Grant/Contract Number:
- AC02-09CH11466; AC05-00OR22725; FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Review of Scientific Instruments
- Additional Journal Information:
- Journal Volume: 87; Journal Issue: 11; Journal ID: ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma diagnostics; charge exchange reactions; particle distribution functions; image sensors; Maxwell equations
Citation Formats
Chrystal, C., Burrell, K. H., Grierson, B. A., Haskey, S. R., Groebner, R. J., Kaplan, D. H., and Briesemeister, A. Improved edge charge exchange recombination spectroscopy in DIII-D. United States: N. p., 2016.
Web. doi:10.1063/1.4958915.
Chrystal, C., Burrell, K. H., Grierson, B. A., Haskey, S. R., Groebner, R. J., Kaplan, D. H., & Briesemeister, A. Improved edge charge exchange recombination spectroscopy in DIII-D. United States. https://doi.org/10.1063/1.4958915
Chrystal, C., Burrell, K. H., Grierson, B. A., Haskey, S. R., Groebner, R. J., Kaplan, D. H., and Briesemeister, A. Tue .
"Improved edge charge exchange recombination spectroscopy in DIII-D". United States. https://doi.org/10.1063/1.4958915. https://www.osti.gov/servlets/purl/1350535.
@article{osti_1350535,
title = {Improved edge charge exchange recombination spectroscopy in DIII-D},
author = {Chrystal, C. and Burrell, K. H. and Grierson, B. A. and Haskey, S. R. and Groebner, R. J. and Kaplan, D. H. and Briesemeister, A.},
abstractNote = {The charge exchange recombination spectroscopy diagnostic on the DIII-D tokamak has been upgraded with the addition of more high radial resolution view chords near the edge of the plasma (r/a > 0.8). The additional views are diagnosed with the same number of spectrometers by placing fiber optics side-by-side at the spectrometer entrance with a precise separation that avoids wavelength shifted crosstalk without the use of bandpass filters. The new views improve measurement of edge impurity parameters in steep gradient, H-mode plasmas with many different shapes. The number of edge view chords with 8 mm radial separation has increased from 16 to 38. New fused silica fibers have improved light throughput and clarify the observation of non-Gaussian spectra that suggest the ion distribution function can be non-Maxwellian in low collisionality plasmas.},
doi = {10.1063/1.4958915},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {Tue Aug 02 00:00:00 EDT 2016},
month = {Tue Aug 02 00:00:00 EDT 2016}
}
Web of Science
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Works referencing / citing this record:
Synthetic diagnostic for assessing spatial averaging of charge exchange recombination spectroscopy measurements
journal, October 2018
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Active spectroscopy measurements of the deuterium temperature, rotation, and density from the core to scrape off layer on the DIII-D tokamak (invited)
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Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER
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