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Title: First results from the implementation of the ITER diagnostic residual gas analyzer prototype at Wendelstein 7-X

Abstract

Fusion reactors and long pulse fusion experiments heavily depend on a continuous fuel cycle, which requires detailed monitoring of exhaust gases. We have used a diagnostic residual gas analyzer (DRGA) built as a prototype for ITER and integrated it on the most advanced stellarator fusion experiment, Wendelstein 7-X (W7-X). The DRGA was equipped with a sampling tube and assessed for gas time of flight sample response, effects of magnetic field on gas detection and practical aspects of use in a state of the art fusion environment. The setup was successfully commissioned and operated and was used to observe the gas composition of W7-X exhaust gases. The measured time of flight gas response was found to be in the order of a second for a 7 m sample tube. High values of magnetic field were found to affect the partial pressure readings of the DRGA and suggest that additional shielding is necessary in future experimental campaigns.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3]; ORCiD logo [1];  [1];  [1];  [1]
+ Show Author Affiliations
  1. Max Planck Inst. fur Plasmaphysik, Greifswald (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
W7-X team
OSTI Identifier:
1564109
Alternate Identifier(s):
OSTI ID: 1560250
Grant/Contract Number:  
AC05-00OR22725; AC05-00OR2272
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 90; Journal Issue: 9; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Schlisio, G., Klepper, C. C., Harris, J. H., Biewer, T. M., Winters, V. R., Wenzel, U., Kornejew, P., Laqua, H., and Krychowiak, M. First results from the implementation of the ITER diagnostic residual gas analyzer prototype at Wendelstein 7-X. United States: N. p., 2019. Web. doi:10.1063/1.5098125.
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Schlisio, G., Klepper, C. C., Harris, J. H., Biewer, T. M., Winters, V. R., Wenzel, U., Kornejew, P., Laqua, H., & Krychowiak, M. First results from the implementation of the ITER diagnostic residual gas analyzer prototype at Wendelstein 7-X. United States. https://doi.org/10.1063/1.5098125
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Schlisio, G., Klepper, C. C., Harris, J. H., Biewer, T. M., Winters, V. R., Wenzel, U., Kornejew, P., Laqua, H., and Krychowiak, M. Sun . "First results from the implementation of the ITER diagnostic residual gas analyzer prototype at Wendelstein 7-X". United States. https://doi.org/10.1063/1.5098125. https://www.osti.gov/servlets/purl/1564109.
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@article{osti_1564109,
title = {First results from the implementation of the ITER diagnostic residual gas analyzer prototype at Wendelstein 7-X},
author = {Schlisio, G. and Klepper, C. C. and Harris, J. H. and Biewer, T. M. and Winters, V. R. and Wenzel, U. and Kornejew, P. and Laqua, H. and Krychowiak, M.},
abstractNote = {Fusion reactors and long pulse fusion experiments heavily depend on a continuous fuel cycle, which requires detailed monitoring of exhaust gases. We have used a diagnostic residual gas analyzer (DRGA) built as a prototype for ITER and integrated it on the most advanced stellarator fusion experiment, Wendelstein 7-X (W7-X). The DRGA was equipped with a sampling tube and assessed for gas time of flight sample response, effects of magnetic field on gas detection and practical aspects of use in a state of the art fusion environment. The setup was successfully commissioned and operated and was used to observe the gas composition of W7-X exhaust gases. The measured time of flight gas response was found to be in the order of a second for a 7 m sample tube. High values of magnetic field were found to affect the partial pressure readings of the DRGA and suggest that additional shielding is necessary in future experimental campaigns.},
doi = {10.1063/1.5098125},
journal = {Review of Scientific Instruments},
number = 9,
volume = 90,
place = {United States},
year = {2019},
month = {9}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5098125
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Cited by: 5 works
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Figures / Tables:

FIG. 1 FIG. 1: Labeled overview of the complete system as installed on W7-X. The inset shows the position of the sampling tube in the port below the divertor and the divertor. Cut taken at 203.4° toroidal angle.
All figures and tables (8 total)
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Works referenced in this record:

Design of a diagnostic residual gas analyzer for the ITER divertor
journal, October 2015

Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X
journal, June 2014

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journal, November 2016

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Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X
journal, November 2013

Laboratory-based validation of the baseline sensors of the ITER diagnostic residual gas analyzer
journal, October 2017

The Filterscope
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Wendelstein 7-X Program—Demonstration of a Stellarator Option for Fusion Energy
journal, September 2016

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  • DOI: 10.1109/TPS.2016.2564919

Spectroscopic imaging of limiter heat and particle fluxes and the resulting impurity sources during Wendelstein 7-X startup plasmas
journal, August 2016

  • Stephey, L.; Wurden, G. A.; Schmitz, O.
  • Review of Scientific Instruments, Vol. 87, Issue 11
  • DOI: 10.1063/1.4959274

Characterisation of a turbo-molecular pumps by a minimum of parameters
journal, February 2007

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    Figures / Tables found in this record:

    FIG. 1 (p. 3)figure
    FIG. 2 (p. 5)figure
    TABLE I (p. 5)table
    FIG. 3 (p. 7)figure
    FIG. 4 (p. 7)figure
    FIG. 5 (p. 9)figure
    FIG. 6 (p. 11)figure
    FIG. 7 (p. 13)figure
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