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Title: Upgrades of edge, divertor and scrape-off layer diagnostics of W7-X for OP1.2

Abstract

In this work, Wendelstein 7-X (W7-X) is the world’s largest superconducting nuclear fusion experiment of the optimized stellarator type. In the first Operation Phase (OP1.1) helium and hydrogen plasmas were studied in limiter configuration. The heating energy was limited to 4 MJ and the main purpose of that campaign was the integral commissioning of the machine and diagnostics, which was achieved very successfully. Already from the beginning a comprehensive set of diagnostics was available to study the plasma. On the path towards high-power, high-performance plasmas, W7-X will be stepwise upgraded from an inertially cooled (OP1.2, limited to 80 MJ) to an actively cooled island divertor (OP2, 10 MW steady-state plasma operation). The machine is prepared for OP1.2 with 10 inertially cooled divertor units, and the experimental campaign has started recently.The paper describes a subset of diagnostics which will be available for OP1.2 to study the plasma edge, divertor and scrape-off layer physics including those already available for OP1.1, plus modifications, upgrades and new systems. In conclusion, the focus of this summary will be on technical and engineering aspects, like feasibility and assembly but also on reliability, thermal loads and shielding against magnetic fields.

Authors:
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Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
the W7-X Team
OSTI Identifier:
1435175
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
Journal Volume: 136; Journal Issue: A; Journal ID: ISSN 0920-3796
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Wendelstein 7-X; Diagnostics; Plasma edge; SOL; Steady-state operation

Citation Formats

Hathiramani, D., Ali, A., Anda, G., Barbui, T., Biedermann, C., Charl, A., Chauvin, D., Czymek, G., Dhard, C. P., Drewelow, P., Dudek, A., Effenberg, F., Ehrke, G., Endler, M., Ennis, D. A., Fellinger, J., Ford, O., Freundt, S., Gradic, D., Grosser, K., Harris, J., Hölbe, H., Jakubowski, M. W., Knaup, M., Kocsis, G., König, R., Krause, M., Kremeyer, T., Kornejew, P., Krychowiak, M., Lambertz, H. T., Jenzsch, H., Mayer, M., Mohr, S., Neubauer, O., Otte, M., Perseo, V., Pilopp, D., Rudischhauser, L., Schmitz, O., Schweer, B., Schülke, M., Stephey, L., Szepesi, T., Terra, A., Toth, M., Wenzel, U., Wurden, G. A., Zoletnik, S., and Pedersen, T. Sunn. Upgrades of edge, divertor and scrape-off layer diagnostics of W7-X for OP1.2. United States: N. p., 2018. Web. https://doi.org/10.1016/j.fusengdes.2018.02.013.
Hathiramani, D., Ali, A., Anda, G., Barbui, T., Biedermann, C., Charl, A., Chauvin, D., Czymek, G., Dhard, C. P., Drewelow, P., Dudek, A., Effenberg, F., Ehrke, G., Endler, M., Ennis, D. A., Fellinger, J., Ford, O., Freundt, S., Gradic, D., Grosser, K., Harris, J., Hölbe, H., Jakubowski, M. W., Knaup, M., Kocsis, G., König, R., Krause, M., Kremeyer, T., Kornejew, P., Krychowiak, M., Lambertz, H. T., Jenzsch, H., Mayer, M., Mohr, S., Neubauer, O., Otte, M., Perseo, V., Pilopp, D., Rudischhauser, L., Schmitz, O., Schweer, B., Schülke, M., Stephey, L., Szepesi, T., Terra, A., Toth, M., Wenzel, U., Wurden, G. A., Zoletnik, S., & Pedersen, T. Sunn. Upgrades of edge, divertor and scrape-off layer diagnostics of W7-X for OP1.2. United States. https://doi.org/10.1016/j.fusengdes.2018.02.013
Hathiramani, D., Ali, A., Anda, G., Barbui, T., Biedermann, C., Charl, A., Chauvin, D., Czymek, G., Dhard, C. P., Drewelow, P., Dudek, A., Effenberg, F., Ehrke, G., Endler, M., Ennis, D. A., Fellinger, J., Ford, O., Freundt, S., Gradic, D., Grosser, K., Harris, J., Hölbe, H., Jakubowski, M. W., Knaup, M., Kocsis, G., König, R., Krause, M., Kremeyer, T., Kornejew, P., Krychowiak, M., Lambertz, H. T., Jenzsch, H., Mayer, M., Mohr, S., Neubauer, O., Otte, M., Perseo, V., Pilopp, D., Rudischhauser, L., Schmitz, O., Schweer, B., Schülke, M., Stephey, L., Szepesi, T., Terra, A., Toth, M., Wenzel, U., Wurden, G. A., Zoletnik, S., and Pedersen, T. Sunn. Wed . "Upgrades of edge, divertor and scrape-off layer diagnostics of W7-X for OP1.2". United States. https://doi.org/10.1016/j.fusengdes.2018.02.013. https://www.osti.gov/servlets/purl/1435175.
@article{osti_1435175,
title = {Upgrades of edge, divertor and scrape-off layer diagnostics of W7-X for OP1.2},
author = {Hathiramani, D. and Ali, A. and Anda, G. and Barbui, T. and Biedermann, C. and Charl, A. and Chauvin, D. and Czymek, G. and Dhard, C. P. and Drewelow, P. and Dudek, A. and Effenberg, F. and Ehrke, G. and Endler, M. and Ennis, D. A. and Fellinger, J. and Ford, O. and Freundt, S. and Gradic, D. and Grosser, K. and Harris, J. and Hölbe, H. and Jakubowski, M. W. and Knaup, M. and Kocsis, G. and König, R. and Krause, M. and Kremeyer, T. and Kornejew, P. and Krychowiak, M. and Lambertz, H. T. and Jenzsch, H. and Mayer, M. and Mohr, S. and Neubauer, O. and Otte, M. and Perseo, V. and Pilopp, D. and Rudischhauser, L. and Schmitz, O. and Schweer, B. and Schülke, M. and Stephey, L. and Szepesi, T. and Terra, A. and Toth, M. and Wenzel, U. and Wurden, G. A. and Zoletnik, S. and Pedersen, T. Sunn},
abstractNote = {In this work, Wendelstein 7-X (W7-X) is the world’s largest superconducting nuclear fusion experiment of the optimized stellarator type. In the first Operation Phase (OP1.1) helium and hydrogen plasmas were studied in limiter configuration. The heating energy was limited to 4 MJ and the main purpose of that campaign was the integral commissioning of the machine and diagnostics, which was achieved very successfully. Already from the beginning a comprehensive set of diagnostics was available to study the plasma. On the path towards high-power, high-performance plasmas, W7-X will be stepwise upgraded from an inertially cooled (OP1.2, limited to 80 MJ) to an actively cooled island divertor (OP2, 10 MW steady-state plasma operation). The machine is prepared for OP1.2 with 10 inertially cooled divertor units, and the experimental campaign has started recently.The paper describes a subset of diagnostics which will be available for OP1.2 to study the plasma edge, divertor and scrape-off layer physics including those already available for OP1.1, plus modifications, upgrades and new systems. In conclusion, the focus of this summary will be on technical and engineering aspects, like feasibility and assembly but also on reliability, thermal loads and shielding against magnetic fields.},
doi = {10.1016/j.fusengdes.2018.02.013},
journal = {Fusion Engineering and Design},
number = A,
volume = 136,
place = {United States},
year = {2018},
month = {2}
}

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Figures / Tables:

Figure 1 Figure 1: Valve box of the divertor gas injection system. It is directly attached to the backside of a divertor module and nozzles are inserted though 3mm holes to the front side of the divertor.

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Works referenced in this record:

Status of High Heat Flux Components at W7-X
journal, March 2014

  • Peacock, Alan; Boscary, Jean; Czerwinski, Michael
  • IEEE Transactions on Plasma Science, Vol. 42, Issue 3
  • DOI: 10.1109/TPS.2014.2302542

Quality Management System in Fusion Research—Experience From W7-X
journal, November 2014

  • Vilbrandt, Reinhard; Bosch, Hans-Stephan; Feist, Jost-Henrich
  • IEEE Transactions on Plasma Science, Vol. 42, Issue 11
  • DOI: 10.1109/TPS.2014.2359075

Risk management as an executive task in the construction of Wendelstein 7-X
journal, October 2013


Configuration Management for Wendelstein 7-X
journal, June 2009


Implementation of Earned Value Management Tools in the Wendelstein 7-X Project
journal, December 2012

  • Lorenz, Axel; Bosch, Hans-Stephan; Kuttler, Katja
  • IEEE Transactions on Plasma Science, Vol. 40, Issue 12
  • DOI: 10.1109/TPS.2012.2220784

Preparation of erosion and deposition investigations on plasma facing components in Wendelstein 7-X
journal, September 2017


    Works referencing / citing this record:

    First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X
    journal, August 2019


    Infrared imaging systems for wall protection in the W7-X stellarator (invited)
    journal, October 2018

    • Jakubowski, Marcin; Drewelow, Peter; Fellinger, Joris
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5038634

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