Verification of Doppler coherence imaging for 2D ion velocity measurements on DIII-D

Samuell, Cameron M.; Allen, S. L.; Meyer, William H.; Isler, Ralph C.; Briesemeister, Alexis; Wilcox, Robert S.; Lasnier, C. J.; Mclean, A. G.; Howard, John

doi:10.1063/1.5039367

Title: Verification of Doppler coherence imaging for 2D ion velocity measurements on DIII-D

Journal Article · 18 September 2018 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/1.5039367 · OSTI ID:1474465

Samuell, Cameron M. ^[1]; Allen, S. L. ^[1]; Meyer, William H. ^[1];

^[2];

^[2]; Lasnier, C. J. ^[1]; Mclean, A. G. ^[1];

^[3]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Australian National Univ., Canberra, ACT (Australia)

Coherence Imaging Spectroscopy (CIS) has emerged as a powerful tool for investigating complex ion phenomena in the boundary of magnetically confined plasma devices. The combination of Fourier-transform interferometry and high-resolution fast-framing cameras has made it possible to make sensitive velocity measurements that are also spatially resolved. However, this sensitivity makes the diagnostic vulnerable to environmental effects including thermal drifts, vibration, and magnetic fields that can influence the velocity measurement. Additionally, the ability to provide an absolute calibration for these geometries can be impacted by differences in the light-collection geometry between the plasma and reference light source, spectral impurities, and the presence of thin-films on in-vessel optics. This work discusses the mitigation of these effects and demonstration that environmental effects result in less than 0.5 km/s error on the DIII-D CIS systems. A diagnostic comparison is used to demonstrate agreement between CIS and traditional spectroscopy once tomographic artifacts are accounted for.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC05-00OR22725; FC02-04ER54698; AC52-07NA27344

OSTI ID:: 1474465

Alternate ID(s):: OSTI ID: 1471265; OSTI ID: 1497310

Report Number(s):: LLNL-JRNL-751781

Journal Information:: Review of Scientific Instruments, Vol. 89, Issue 9; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Cited By (2)

Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements Perseo, Valeria; Gradic, Dorothea; König, Ralf Review of Scientific Instruments, Vol. 91, Issue 1 https://doi.org/10.1063/1.5126098	journal	January 2020
Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology Perseo, V.; Effenberg, F.; Gradic, D. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab4320	journal	September 2019

Figures / Tables (11)

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
plasma confinement
Doppler effect
coherence imaging
interferometry
crystal optics
chemical elements
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Physics - Plasma physics