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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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Free Publicly Available Full Text
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Figures / Tables:

FIG. 1 FIG. 1: Photograph of the SOL instrument before mounting in the shield box. Displayed components include: A: Front 50 mm lens (collimator); B: filter wheel; C: resistive heater elements surrounding interferometer cell; D: rear of interferometer cell; E: rear 50 mm lens; F: camera; G: camera mounting plate; and H:more » rigid optical rail.« less

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Works referenced in this record:

Localization of emission through interpretation of observed Zeeman pattern
journal, April 2000

  • Weaver, J. L.; Welch, B. L.; Griem, H. R.
  • Review of Scientific Instruments, Vol. 71, Issue 4
  • DOI: 10.1063/1.1150516

Wide-angle ITER-prototype tangential infrared and visible viewing system for DIII-D
journal, November 2014

  • Lasnier, C. J.; Allen, S. L.; Ellis, R. E.
  • Review of Scientific Instruments, Vol. 85, Issue 11
  • DOI: 10.1063/1.4892897

Time resolved coherence-imaging spectrometer on WEGA stellarator
journal, May 2005


Faraday Rotation in Birefringent Crystals
journal, August 1971


Transport and drift-driven plasma flow components in the Alcator C-Mod boundary plasma
journal, January 2013


Coherence imaging of scrape-off-layer and divertor impurity flows in the Mega Amp Spherical Tokamak (invited)
journal, November 2014

  • Silburn, S. A.; Harrison, J. R.; Howard, J.
  • Review of Scientific Instruments, Vol. 85, Issue 11
  • DOI: 10.1063/1.4891165

Coherence imaging for ion temperature and flow measurements in a low-temperature helicon plasma source
journal, January 2016


Poloidally and radially resolved parallel D+ velocity measurements in the DIII-D boundary and comparison to neoclassical computations
journal, March 2011

  • Boedo, J. A.; Belli, E. A.; Hollmann, E.
  • Physics of Plasmas, Vol. 18, Issue 3
  • DOI: 10.1063/1.3559492

Spectroscopic characterization of the DIII-D divertor
journal, February 1997

  • Isler, R. C.; Wood, R. W.; Klepper, C. C.
  • Physics of Plasmas, Vol. 4, Issue 2
  • DOI: 10.1063/1.872095

Time-resolved two-dimensional plasma spectroscopy using coherence-imaging techniques
journal, May 2003


Spectroscopic analysis of normal and reversed ion flows in the DIII-D divertor
journal, February 1999

  • Isler, R. C.; Brooks, N. H.; West, W. P.
  • Physics of Plasmas, Vol. 6, Issue 2
  • DOI: 10.1063/1.873198

A comparison of experimental measurements and code results to determine flows in the JET SOL
journal, September 2004

  • Erents, S. K.; Pitts, R. A.; Fundamenski, W.
  • Plasma Physics and Controlled Fusion, Vol. 46, Issue 11
  • DOI: 10.1088/0741-3335/46/11/006

Carbon flows in attached divertor plasmas
journal, May 1999

  • Isler, R. C.; Brooks, N. H.; West, W. P.
  • Physics of Plasmas, Vol. 6, Issue 5
  • DOI: 10.1063/1.873442

Flow reversal, convection, and modeling in the DIII-D divertor
journal, December 1998

  • Boedo, J. A.; Porter, G. D.; Schaffer, M. J.
  • Physics of Plasmas, Vol. 5, Issue 12
  • DOI: 10.1063/1.873168

Coherence Imaging of Flows in the DIII-D Divertor
journal, March 2011

  • Howard, J.; Diallo, A.; Creese, M.
  • Contributions to Plasma Physics, Vol. 51, Issue 2-3
  • DOI: 10.1002/ctpp.201000062

2D imaging of helium ion velocity in the DIII-D divertor
journal, May 2018

  • Samuell, C. M.; Porter, G. D.; Meyer, W. H.
  • Physics of Plasmas, Vol. 25, Issue 5
  • DOI: 10.1063/1.5017999

Doppler coherence imaging and tomography of flows in tokamak plasmas (invited)
journal, October 2010

  • Howard, J.; Diallo, A.; Creese, M.
  • Review of Scientific Instruments, Vol. 81, Issue 10
  • DOI: 10.1063/1.3492422

The MOSS camera on H-1NF
journal, January 2001

  • Michael, C. A.; Howard, J.; Blackwell, B. D.
  • Review of Scientific Instruments, Vol. 72, Issue 1
  • DOI: 10.1063/1.1326903

Effect of cross-field drifts on flows in the main scrape-off-layer of DIII-D L-mode plasmas
journal, September 2009


Kinetic simulations of scrape-off layer physics in the DIII-D tokamak
journal, August 2017