Improved edge charge exchange recombination spectroscopy in DIII-D

Chrystal, Colin; Burrell, K. H.; Grierson, Brian A.; Haskey, Shaun R.; Groebner, R. J.; Kaplan, David H.; Briesemeister, Alexis R.

doi:10.1063/1.4958915

Improved edge charge exchange recombination spectroscopy in DIII-D

Journal Article · Tue Aug 02 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4958915· OSTI ID:1287042

Chrystal, Colin ^[1]; Burrell, K. H. ^[2]; Grierson, Brian A. ^[3]; Haskey, Shaun R. ^[3]; Groebner, R. J. ^[2]; Kaplan, David H. ^[2]; Briesemeister, Alexis R. ^[4]

Oak Ridge Assoc. 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)

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.As a result, 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.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Contributing Organization:: 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

Grant/Contract Number:: AC02-09CH11466; AC05-00OR22725; FC02-04ER54698

OSTI ID:: 1287042

Alternate ID(s):: OSTI ID: 1350535
OSTI ID: 1372083

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 87; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Edge localized mode suppression and plasma response using mixed toroidal harmonic resonant magnetic perturbations in DIII-D Gu, S.; Sun, Y.; Paz-Soldan, C. Nuclear Fusion, Vol. 59, Issue 2 https://doi.org/10.1088/1741-4326/aaf5a3	journal	January 2019
Modeling of inter- and intra-edge-localized mode tungsten erosion during DIII-D H-mode discharges Xu, G. L.; Guterl, J.; Abrams, T. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab3e96	journal	October 2019

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Improved edge charge exchange recombination spectroscopy in DIII-D

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