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Title: Design of a new charge exchange recombination spectroscopy diagnostic for impurity transport experiments at Wendelstein 7-X

Abstract

In this study, we present the design of a new charge exchange recombination spectroscopy (CXRS) system for Wendelstein 7-X (W7-X), which aims at measuring line radiation from highly ionized iron impurities after laser blow off injections over transport timescales. New fiber bundles with a core diameter of 600 µm have been added to one of the existing optical systems at W7-X used for CXRS. The fibers direct collected light to five newly developed single channel high frame rate F/2.8 spectrometers. The new custom-made spectrometers are built using entirely off-the-shelf and 3D printed components, and employ a round-to-linear fiber bundle, instead of an entrance slit, to maximize light throughput. The detector is an ultra-low readout noise EM-CCD camera capable of frame rates of up to 10 000 fps for about 500 consecutive frames when operated using a single readout channel. Such high frame rates will enable the study of inward convection of injected impurities. An initial sensitivity study is performed using a newly developed Markov chain Monte Carlo approach based on the pySTRAHL impurity transport code. This study indicates that, with the addition of the new CX diagnostic, impurity convection velocities can be inferred.

Authors:
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Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1893202
Grant/Contract Number:  
SC0020990
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Name: Review of Scientific Instruments Journal Volume: 93 Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Swee, Colin, Geiger, Benedikt, Albosta, Ryan, Ford, Oliver, Loch, Stuart, Nornberg, M. D., Schellpheffer, Jacob, Wegner, Thomas, and W7-X Team. Design of a new charge exchange recombination spectroscopy diagnostic for impurity transport experiments at Wendelstein 7-X. United States: N. p., 2022. Web. doi:10.1063/5.0101842.
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Swee, Colin, Geiger, Benedikt, Albosta, Ryan, Ford, Oliver, Loch, Stuart, Nornberg, M. D., Schellpheffer, Jacob, Wegner, Thomas, & W7-X Team. Design of a new charge exchange recombination spectroscopy diagnostic for impurity transport experiments at Wendelstein 7-X. United States. https://doi.org/10.1063/5.0101842
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Swee, Colin, Geiger, Benedikt, Albosta, Ryan, Ford, Oliver, Loch, Stuart, Nornberg, M. D., Schellpheffer, Jacob, Wegner, Thomas, and W7-X Team. Mon . "Design of a new charge exchange recombination spectroscopy diagnostic for impurity transport experiments at Wendelstein 7-X". United States. https://doi.org/10.1063/5.0101842.
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@article{osti_1893202,
title = {Design of a new charge exchange recombination spectroscopy diagnostic for impurity transport experiments at Wendelstein 7-X},
author = {Swee, Colin and Geiger, Benedikt and Albosta, Ryan and Ford, Oliver and Loch, Stuart and Nornberg, M. D. and Schellpheffer, Jacob and Wegner, Thomas and W7-X Team},
abstractNote = {In this study, we present the design of a new charge exchange recombination spectroscopy (CXRS) system for Wendelstein 7-X (W7-X), which aims at measuring line radiation from highly ionized iron impurities after laser blow off injections over transport timescales. New fiber bundles with a core diameter of 600 µm have been added to one of the existing optical systems at W7-X used for CXRS. The fibers direct collected light to five newly developed single channel high frame rate F/2.8 spectrometers. The new custom-made spectrometers are built using entirely off-the-shelf and 3D printed components, and employ a round-to-linear fiber bundle, instead of an entrance slit, to maximize light throughput. The detector is an ultra-low readout noise EM-CCD camera capable of frame rates of up to 10 000 fps for about 500 consecutive frames when operated using a single readout channel. Such high frame rates will enable the study of inward convection of injected impurities. An initial sensitivity study is performed using a newly developed Markov chain Monte Carlo approach based on the pySTRAHL impurity transport code. This study indicates that, with the addition of the new CX diagnostic, impurity convection velocities can be inferred.},
doi = {10.1063/5.0101842},
journal = {Review of Scientific Instruments},
number = 10,
volume = 93,
place = {United States},
year = {Mon Oct 17 00:00:00 EDT 2022},
month = {Mon Oct 17 00:00:00 EDT 2022}
}
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https://doi.org/10.1063/5.0101842
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