First results from divertor operation in Wendelstein 7-X

Pedersen, Thomas Sunn; König, Ralf; Krychowiak, Maciej; Jakubowski, Marcin; Baldzuhn, Jürgen; Bozhenkov, Sergey; Fuchert, Golo; Langenberg, Andreas; Niemann, Holger; Zhang, Daihong; Rahbarnia, Kian; Bosch, Hans -Stephan; Kazakov, Yevgen; Brezinsek, Sebastijan; Gao, Yu; Pablant, Novimir

doi:10.1088/1361-6587/aaec25

Title: First results from divertor operation in Wendelstein 7-X

Journal Article · 26 November 2018 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/aaec25 · OSTI ID:1485471

^[1]; König, Ralf ^[1]; Krychowiak, Maciej ^[1];

^[2]; Baldzuhn, Jürgen ^[1];

^[1]; Fuchert, Golo ^[1];

^[1]; Niemann, Holger ^[1]; Zhang, Daihong ^[1]; Rahbarnia, Kian ^[1];

^[1];

^[3];

^[4]; Gao, Yu ^[4]; Pablant, Novimir ^[5]

Max Planck Institute for Plasma Physics, Greifswald (Germany)
Max Planck Institute for Plasma Physics, Greifswald (Germany); Univ. of Szczecin, Szczecin (Poland)
LPP-ERM/KMS, Brussels (Belgium)
Research Center Julich, Julich (Germany)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Wendelstein 7-X is a highly optimized stellarator that went into operation in 2015. With a 30 cubic meter volume, a superconducting coil system operating at 2.5 T, and steady-state heating capability of eventually up to 10 MW, it was built to demonstrate the benefits of optimized stellarators at parameters approaching those of a fusion power plant. We report here on the first results with the test divertor installed, during the second operation phase, which was performed in the second half of 2017. Operation with a divertor, and the addition of several new fueling systems, allowed higher density operation in hydrogen as well as helium. Here, the effects that higher density operation had on both divertor operation and global confinement will be described. In particular, at high densities detachment was observed, and the highest fusion triple product for a stellarator was achieved.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: the W7-X Team

Grant/Contract Number:: SC0014210

OSTI ID:: 1485471

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 1 Vol. 61; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (10)

Performance of Wendelstein 7-X stellarator plasmas during the first divertor operation phase Wolf, R. C.; Alonso, A.; Äkäslompolo, S. Physics of Plasmas, Vol. 26, Issue 8 https://doi.org/10.1063/1.5098761	journal	August 2019
Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies Wolf, R. C.; Bozhenkov, S.; Dinklage, A. Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aaeab2	journal	November 2018
Pellet fueling experiments in Wendelstein 7-X Baldzuhn, J.; Damm, H.; Beidler, C. D. Plasma Physics and Controlled Fusion, Vol. 61, Issue 9 https://doi.org/10.1088/1361-6587/ab3567	journal	August 2019
Overview of first Wendelstein 7-X high-performance operation Klinger, T.; Andreeva, T.; Bozhenkov, S. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab03a7	journal	June 2019
Methods for quantitative study of divertor heat loads on W7-X Gao, Y.; Jakubowski, Marcin W.; Drewelow, Peter Nuclear Fusion, Vol. 59, Issue 6 https://doi.org/10.1088/1741-4326/ab0f49	journal	April 2019
Effects of toroidal plasma current on divertor power depositions on Wendelstein 7-X Gao, Yu; Geiger, Joachim; Jakubowski, Marcin W. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab32c2	journal	August 2019
First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X Effenberg, F.; Brezinsek, S.; Feng, Y. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab32c4	journal	August 2019
Neural network regression approaches to reconstruct properties of magnetic configuration from Wendelstein 7-X modeled heat load patterns Blatzheim, Marko; Böckenhoff, Daniel Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab4123	journal	October 2019
Overview of first Wendelstein 7-X high-performance operation Klinger, T.; Andreeva, T.; Bozhenkov, Sergey Technische Universität Berlin https://doi.org/10.14279/depositonce-15100	text	January 2019
Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies Wolf, R. C.; Bozhenkov, S.; Dinklage, A. Karlsruhe https://doi.org/10.5445/ir/1000089099	text	January 2019

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Title: First results from divertor operation in Wendelstein 7-X

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