Improved edge charge exchange recombination spectroscopy in DIII-D

Chrystal, C.; Burrell, K. H.; Grierson, B. A.; Haskey, S. R.; Groebner, R. J.; Kaplan, D. H.; Briesemeister, A.

doi:10.1063/1.4958915

Title: 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:1350535

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^[2]; Grierson, B. A. ^[3];

^[3]; Groebner, R. J. ^[2]; Kaplan, D. H. ^[2];

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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)

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.

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Research Organization:: 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 Organization:: 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:: 1350535

Alternate ID(s):: OSTI ID: 1287042; OSTI ID: 1372083

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

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

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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References (15)

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Synthetic diagnostic for assessing spatial averaging of charge exchange recombination spectroscopy measurements Chrystal, C.; Sulyman, A. A.; Haskey, S. R. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5036964	journal	October 2018
Active spectroscopy measurements of the deuterium temperature, rotation, and density from the core to scrape off layer on the DIII-D tokamak (invited) Haskey, S. R.; Grierson, B. A.; Stagner, L. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038349	journal	October 2018
Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER Abrams, T.; Unterberg, E. A.; Rudakov, D. L. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5089895	journal	June 2019
Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak Rodriguez-Fernandez, P.; White, A. E.; Howard, N. T. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5096800	journal	June 2019
Main ion and impurity edge profile evolution across the L- to H-mode transition on DIII-D Haskey, S. R.; Grierson, B. A.; Chrystal, C. Plasma Physics and Controlled Fusion, Vol. 60, Issue 10 https://doi.org/10.1088/1361-6587/aad702	journal	August 2018
Experimental characterization of the effect of E × B shear on edge-harmonic oscillation mode structure Chen, M.; Luo, C.; Zhu, Y. Plasma Physics and Controlled Fusion, Vol. 61, Issue 8 https://doi.org/10.1088/1361-6587/ab2174	journal	June 2019
Deuterium temperature, drift velocity, and density measurements in non-Maxwellian plasmas at ASDEX Upgrade Salewski, M.; Geiger, B.; Jacobsen, A. S. Nuclear Fusion, Vol. 58, Issue 3 https://doi.org/10.1088/1741-4326/aaa6e1	journal	February 2018
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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Title: Improved edge charge exchange recombination spectroscopy in DIII-D

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