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

Schlisio, G.; Klepper, C. C.; Harris, J. H.; Biewer, T. M.; Winters, V. R.; Wenzel, U.; Kornejew, P.; Laqua, H.; Krychowiak, M.

doi:10.1063/1.5098125

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

Journal Article · Sun Sep 01 00:00:00 EDT 2019 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5098125· OSTI ID:1564109

^[1];

^[2];

^[2]; Winters, V. R. ^[3];

^[1]; Kornejew, P. ^[1]; Laqua, H. ^[1]; Krychowiak, M. ^[1]

Max Planck Inst. fur Plasmaphysik, Greifswald (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
University of Wisconsin-Madison, Madison, Wisconsin 53706, USA

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.

View Accepted Manuscript (DOE)

View Accepted Manuscript (Publisher)

Cite

Export

Save

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: W7-X team

Grant/Contract Number:: AC05-00OR22725; AC05-00OR2272

OSTI ID:: 1564109

Alternate ID(s):: OSTI ID: 1560250

Journal Information:: Review of Scientific Instruments, Vol. 90, Issue 9; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 5 works

Citation information provided by
Web of Science

References (13)

Design of a diagnostic residual gas analyzer for the ITER divertor Klepper, C. C.; Biewer, T. M.; Graves, V. B. Fusion Engineering and Design, Vol. 96-97 https://doi.org/10.1016/j.fusengdes.2015.04.053	journal	October 2015
Study and design of the ion cyclotron resonance heating system for the stellarator Wendelstein 7-X Ongena, J.; Messiaen, A.; Van Eester, D. Physics of Plasmas, Vol. 21, Issue 6 https://doi.org/10.1063/1.4884377	journal	June 2014
Description of the prototype diagnostic residual gas analyzer for ITER Younkin, T. R.; Biewer, T. M.; Klepper, C. C. Review of Scientific Instruments, Vol. 85, Issue 11 https://doi.org/10.1063/1.4892157	journal	November 2014
Status and High Power Performance of the 10-MW 140-GHz ECH System for the Stellarator Wendelstein 7-X Thumm, Manfred; Brand, Peter; Braune, Harald Plasma and Fusion Research, Vol. 5 https://doi.org/10.1585/pfr.5.s1006	journal	January 2010
Confirmation of the topology of the Wendelstein 7-X magnetic field to better than 1:100,000 Pedersen, T. Sunn; Otte, M.; Lazerson, S. Nature Communications, Vol. 7, Issue 1 https://doi.org/10.1038/ncomms13493	journal	November 2016
Microwave stray radiation: Measures for steady state diagnostics at Wendelstein 7-X Hathiramani, Dag; Binder, Roland; Brakel, Rudolf Fusion Engineering and Design, Vol. 88, Issue 6-8 https://doi.org/10.1016/j.fusengdes.2013.01.003	journal	October 2013
Foundations of Vacuum Science and Technology Lafferty, James M.; Rubin, Lawrence G. Physics Today, Vol. 52, Issue 3 https://doi.org/10.1063/1.882616	journal	March 1999
Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X Bosch, H. -S.; Wolf, R. C.; Andreeva, T. Nuclear Fusion, Vol. 53, Issue 12 https://doi.org/10.1088/0029-5515/53/12/126001	journal	November 2013
Laboratory-based validation of the baseline sensors of the ITER diagnostic residual gas analyzer Klepper, C. C.; Biewer, T. M.; Marcus, C. Journal of Instrumentation, Vol. 12, Issue 10 https://doi.org/10.1088/1748-0221/12/10/c10012	journal	October 2017
The Filterscope Colchin, R. J.; Hillis, D. L.; Maingi, R. Review of Scientific Instruments, Vol. 74, Issue 3 https://doi.org/10.1063/1.1537038	journal	March 2003
Wendelstein 7-X Program—Demonstration of a Stellarator Option for Fusion Energy Wolf, R. C.; Beidler, C. D.; Dinklage, A. IEEE Transactions on Plasma Science, Vol. 44, Issue 9 https://doi.org/10.1109/TPS.2016.2564919	journal	September 2016
Spectroscopic imaging of limiter heat and particle fluxes and the resulting impurity sources during Wendelstein 7-X startup plasmas Stephey, L.; Wurden, G. A.; Schmitz, O. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4959274	journal	August 2016
Characterisation of a turbo-molecular pumps by a minimum of parameters Malyshev, Oleg B. Vacuum, Vol. 81, Issue 6 https://doi.org/10.1016/j.vacuum.2005.11.055	journal	February 2007