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

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/1.5039367· OSTI ID:1474465
 [1];  [1];  [1];  [2];  [2];  [2];  [1];  [1];  [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Australian National Univ., Canberra, ACT (Australia)
+ Show Author Affiliations
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.
Research Organization:
General Atomics, San Diego, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Grant/Contract Number:
AC05-00OR22725; AC52-07NA27344; FC02-04ER54698
OSTI ID:
1474465
Alternate ID(s):
OSTI ID: 1471265
OSTI ID: 1497310
Report Number(s):
LLNL-JRNL-751781
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 9 Vol. 89; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements journal January 2020
Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology journal September 2019

Figures / Tables (11)

FIG. 1(p. 2)figure FIG. 1
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FIG. 10(p. 7)figure FIG. 10
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FIG. 11(p. 8)figure FIG. 11

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Related Subjects

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