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Title: A dual wavelength imaging system for plasma-surface interaction studies on the National Spherical Torus Experiment Upgrade

Abstract

A two-channel spectral imaging system based on a charge injection device radiation-hardened intensified camera was built for studies of plasma-surface interactions on divertor plasma facing components in the National Spherical Torus Experiment Upgrade (NSTX-U) tokamak. By means of commercially available mechanically referenced optical components, the two-wavelength setup images the light from the plasma, relayed by a fiber optic bundle, at two different wavelengths side-by-side on the same detector. Remotely controlled filter wheels are used for narrow band pass and neutral density filters on each optical path allowing for simultaneous imaging of emission at wavelengths differing in brightness up to 3 orders of magnitude. Applications on NSTX-U will include the measurement of impurity influxes in the lower divertor strike point region and the imaging of plasma-material interaction on the head of the surface analysis probe MAPP (Material Analysis and Particle Probe). Furthermore, the diagnostic setup and initial results from its application on the lithium tokamak experiment are presented.

Authors:
 [1];  [1]
+ Show Author Affiliations
  1. 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
OSTI Identifier:
1266684
Report Number(s):
LLNL-JRNL-672462
Journal ID: ISSN 0034-6748; RSINAK
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 12; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; image sensors; lithium; divertors; cameras; tokamaks

Citation Formats

Scotti, F., and Soukhanovskii, V. A. A dual wavelength imaging system for plasma-surface interaction studies on the National Spherical Torus Experiment Upgrade. United States: N. p., 2015. Web. doi:10.1063/1.4935609.
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Scotti, F., & Soukhanovskii, V. A. A dual wavelength imaging system for plasma-surface interaction studies on the National Spherical Torus Experiment Upgrade. United States. https://doi.org/10.1063/1.4935609
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Scotti, F., and Soukhanovskii, V. A. Wed . "A dual wavelength imaging system for plasma-surface interaction studies on the National Spherical Torus Experiment Upgrade". United States. https://doi.org/10.1063/1.4935609. https://www.osti.gov/servlets/purl/1266684.
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@article{osti_1266684,
title = {A dual wavelength imaging system for plasma-surface interaction studies on the National Spherical Torus Experiment Upgrade},
author = {Scotti, F. and Soukhanovskii, V. A.},
abstractNote = {A two-channel spectral imaging system based on a charge injection device radiation-hardened intensified camera was built for studies of plasma-surface interactions on divertor plasma facing components in the National Spherical Torus Experiment Upgrade (NSTX-U) tokamak. By means of commercially available mechanically referenced optical components, the two-wavelength setup images the light from the plasma, relayed by a fiber optic bundle, at two different wavelengths side-by-side on the same detector. Remotely controlled filter wheels are used for narrow band pass and neutral density filters on each optical path allowing for simultaneous imaging of emission at wavelengths differing in brightness up to 3 orders of magnitude. Applications on NSTX-U will include the measurement of impurity influxes in the lower divertor strike point region and the imaging of plasma-material interaction on the head of the surface analysis probe MAPP (Material Analysis and Particle Probe). Furthermore, the diagnostic setup and initial results from its application on the lithium tokamak experiment are presented.},
doi = {10.1063/1.4935609},
journal = {Review of Scientific Instruments},
number = 12,
volume = 86,
place = {United States},
year = {Wed Dec 09 00:00:00 EST 2015},
month = {Wed Dec 09 00:00:00 EST 2015}
}
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https://doi.org/10.1063/1.4935609
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    Works referencing / citing this record:

    Diagnostics for molybdenum and tungsten erosion and transport in NSTX-U
    journal, October 2016

    • Scotti, F.; Soukhanovskii, V. A.; Weller, M. E.
    • Review of Scientific Instruments, Vol. 87, Issue 11
    • DOI: 10.1063/1.4963146

    Scenario development during commissioning operations on the National Spherical Torus Experiment Upgrade
    journal, February 2018

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