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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]
  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:
Journal Article: 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.
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
Schlisio, G., Klepper, C. C., Harris, J. H., Biewer, T. M., Winters, V. R., Wenzel, U., Kornejew, P., Laqua, H., and Krychowiak, M. 2019. "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.
@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},
url = {https://www.osti.gov/biblio/1564109}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 9,
volume = 90,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 2019},
month = {Sun Sep 01 00:00:00 EDT 2019}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
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.

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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


Description of the prototype diagnostic residual gas analyzer for ITER
journal, November 2014


Status and High Power Performance of the 10-MW 140-GHz ECH System for the Stellarator Wendelstein 7-X
journal, January 2010


Confirmation of the topology of the Wendelstein 7-X magnetic field to better than 1:100,000
journal, November 2016


Microwave stray radiation: Measures for steady state diagnostics at Wendelstein 7-X
journal, October 2013


Foundations of Vacuum Science and Technology
journal, March 1999


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
journal, March 2003


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


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


Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.