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

Abstract

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.

Authors:
 [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [1];  [1]; ORCiD logo [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)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1474465
Alternate Identifier(s):
OSTI ID: 1471265; OSTI ID: 1497310
Report Number(s):
LLNL-JRNL-751781
Journal ID: ISSN 0034-6748
Grant/Contract Number:  
AC05-00OR22725; FC02-04ER54698; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 9; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
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; imaging spectroscopy; interferometers; Physics - Plasma physics

Citation Formats

Samuell, Cameron M., Allen, S. L., Meyer, William H., Isler, Ralph C., Briesemeister, Alexis, Wilcox, Robert S., Lasnier, C. J., Mclean, A. G., and Howard, John. Verification of Doppler coherence imaging for 2D ion velocity measurements on DIII-D. United States: N. p., 2018. Web. doi:10.1063/1.5039367.
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. Verification of Doppler coherence imaging for 2D ion velocity measurements on DIII-D. United States. doi:10.1063/1.5039367.
Samuell, Cameron M., Allen, S. L., Meyer, William H., Isler, Ralph C., Briesemeister, Alexis, Wilcox, Robert S., Lasnier, C. J., Mclean, A. G., and Howard, John. Tue . "Verification of Doppler coherence imaging for 2D ion velocity measurements on DIII-D". United States. doi:10.1063/1.5039367. https://www.osti.gov/servlets/purl/1474465.
@article{osti_1474465,
title = {Verification of Doppler coherence imaging for 2D ion velocity measurements on DIII-D},
author = {Samuell, Cameron M. and Allen, S. L. and Meyer, William H. and Isler, Ralph C. and Briesemeister, Alexis and Wilcox, Robert S. and Lasnier, C. J. and Mclean, A. G. and Howard, John},
abstractNote = {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.},
doi = {10.1063/1.5039367},
journal = {Review of Scientific Instruments},
number = 9,
volume = 89,
place = {United States},
year = {2018},
month = {9}
}

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