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Title: Thomson scattering measurements on DIII-D using in-vessel laser mirrors and lenses to diagnose a new divertor location

Abstract

Translatable in-vessel mirrors have allowed the DIII-D Thomson scattering system to diagnose the divertor plasma in high triangularity shaped plasmas. Previous divertor Thomson scattering measurements in DIII-D were restricted to spatial locations along a Nd:YAG laser beam that was directed through a vertical port. This only allowed measurements to be made in low triangularity shaped plasmas. The new mirrors re-route the laser underneath floor tiles to a position of smaller major radius as necessary for high triangularity plasmas. New in-vessel collection optics transmit scattered light from regions inaccessible to external lenses. Damage to mirrors and high stray light levels are challenges that were overcome to successfully make these measurements. Through the careful use of baffles and light shields, stray light leakage into polychromator detector channels was reduced to negligible levels, allowing temperature measurements below 1 eV. The system is described and the initial results introduced.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [1];  [1]
+ Show Author Affiliations
  1. General Atomics, San Diego, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1545486
Alternate Identifier(s):
OSTI ID: 1474769
Grant/Contract Number:  
FC02-04ER54698; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Conference: 22. Proceedings of the Topical Conference on High-Temperature Plasma Diagnostics, San Diego, CA (United States); 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

Citation Formats

Carlstrom, T. N., Glass, F., Du, D., McLean, A. G., Taussig, D., and Boivin, R. Thomson scattering measurements on DIII-D using in-vessel laser mirrors and lenses to diagnose a new divertor location. United States: N. p., 2018. Web. doi:10.1063/1.5036968.
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Carlstrom, T. N., Glass, F., Du, D., McLean, A. G., Taussig, D., & Boivin, R. Thomson scattering measurements on DIII-D using in-vessel laser mirrors and lenses to diagnose a new divertor location. United States. doi:10.1063/1.5036968.
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Carlstrom, T. N., Glass, F., Du, D., McLean, A. G., Taussig, D., and Boivin, R. Fri . "Thomson scattering measurements on DIII-D using in-vessel laser mirrors and lenses to diagnose a new divertor location". United States. doi:10.1063/1.5036968. https://www.osti.gov/servlets/purl/1545486.
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@article{osti_1545486,
title = {Thomson scattering measurements on DIII-D using in-vessel laser mirrors and lenses to diagnose a new divertor location},
author = {Carlstrom, T. N. and Glass, F. and Du, D. and McLean, A. G. and Taussig, D. and Boivin, R.},
abstractNote = {Translatable in-vessel mirrors have allowed the DIII-D Thomson scattering system to diagnose the divertor plasma in high triangularity shaped plasmas. Previous divertor Thomson scattering measurements in DIII-D were restricted to spatial locations along a Nd:YAG laser beam that was directed through a vertical port. This only allowed measurements to be made in low triangularity shaped plasmas. The new mirrors re-route the laser underneath floor tiles to a position of smaller major radius as necessary for high triangularity plasmas. New in-vessel collection optics transmit scattered light from regions inaccessible to external lenses. Damage to mirrors and high stray light levels are challenges that were overcome to successfully make these measurements. Through the careful use of baffles and light shields, stray light leakage into polychromator detector channels was reduced to negligible levels, allowing temperature measurements below 1 eV. The system is described and the initial results introduced.},
doi = {10.1063/1.5036968},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {9}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI:  10.1063/1.5036968
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Citation Metrics:
Cited by: 2 works
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Figures / Tables:

FIG. 1. FIG. 1.: Location of the laser beams for Thomson scattering measurements in DIII-D. Also shown are the standard shelf Divertor Thomson Scattering (DTS) measurement locations and the new floor DTS locations.
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Works referenced in this record:

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journal, January 1995

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  • Review of Scientific Instruments, Vol. 66, Issue 1
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Outline of optical design and viewing geometry for divertor Thomson scattering on MAST upgrade
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Upgraded divertor Thomson scattering system on DIII-D
journal, July 2016

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  • DOI: 10.1063/1.4955281

The ITER divertor Thomson scattering system: engineering and advanced hardware solutions
journal, February 2012

Physical aspects of divertor Thomson scattering implementation on ITER
journal, March 2014

Design, fabrication and installation of the lower divertor for DIII-D
journal, October 2007

Optimizing stability, transport, and divertor operation through plasma shaping for steady-state scenario development in DIII-D
journal, May 2009

  • Holcomb, C. T.; Ferron, J. R.; Luce, T. C.
  • Physics of Plasmas, Vol. 16, Issue 5
  • DOI: 10.1063/1.3125934
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    Works referencing / citing this record:

    Pulse-burst laser-based 10 kHz Thomson scattering measurements
    journal, August 2019

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      Figures / Tables found in this record:

      FIG. 1. (p. 3)figure
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      FIG. 7. (p. 5)figure
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      FIG. 9. (p. 5)figure
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