Infrared imaging systems for wall protection in the W7-X stellarator (invited)

Jakubowski, Marcin; Drewelow, Peter; Fellinger, Joris; Sitjes, Aleix Puig; Wurden, Glen Anthony; Ali, Adnan; Biedermann, Christoph; Cannas, Barbara; Chauvin, Didier; Gamradt, Marc; Greve, Henry; Gao, Yu; Hathiramani, Dag; König, Ralf; Lorenz, Axel; Moncada, Victor; Niemann, Holger; Ngo, Tran Thanh; Pisano, Fabio; Pedersen, Thomas Sunn

doi:10.1063/1.5038634

Title: Infrared imaging systems for wall protection in the W7-X stellarator (invited)

Journal Article · 15 October 2018 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/1.5038634 · OSTI ID:1481978

^[1];

^[2]; Fellinger, Joris ^[2]; Sitjes, Aleix Puig ^[2];

^[3]; Ali, Adnan ^[2]; Biedermann, Christoph ^[2]; Cannas, Barbara ^[4]; Chauvin, Didier ^[2]; Gamradt, Marc ^[2]; Greve, Henry ^[2]; Gao, Yu ^[5]; Hathiramani, Dag ^[2]; König, Ralf ^[2]; Lorenz, Axel ^[2]; Moncada, Victor ^[6]; Niemann, Holger ^[2]; Ngo, Tran Thanh ^[7];

^[4]; Pedersen, Thomas Sunn ^[2]

Max-Planck-Institut fur Plasmaphysik, Greifswald (Germany); Univ. of Szczecin, Szczecin (Poland)
Max-Planck-Institut fur Plasmaphysik, Greifswald (Germany)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Cagliari, Cagliari (Italy)
Forschungszentrum Julich GmbH, Julich (Germany)
Thermadiag, Meyreul (France)
CEA Cadarache, Cadarache (France)

Here, Wendelstein 7-X aims at quasi-steady state operation with up to 10 MW of heating power for 30 min. Power exhaust will be handled predominantly via 10 actively water cooled CFC (carbon-fiber-reinforced carbon) based divertor units designed to withstand power loads of 10 MW/m² locally in steady state. If local loads exceed this value, a risk of local delamination of the CFC and failure of entire divertor modules arises. Infrared endoscopes to monitor all main plasma facing components are being prepared, and near real time software tools are under development to identify areas of excessive temperature rise, to distinguish them from non-critical events, and to trigger alarms. Tests with different cameras were made in the recent campaign. Long pulse operation enforces additional diagnostic design constraints: for example, the optics need to be thermally decoupled from the endoscope housing. In the upcoming experimental campaign, a graphite scraper element, in front of the island divertor throat, will be tested as a possible means to protect the divertor pumping gap edges during the transient discharge evolution.

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Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Contributing Organization:: W7-XTeam

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1481978

Report Number(s):: LA-UR-18-20296

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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Cited By (11)

Towards a new image processing system at Wendelstein 7-X: From spatial calibration to characterization of thermal events Pisano, F.; Cannas, B.; Jakubowski, M. W. Review of Scientific Instruments, Vol. 89, Issue 12 https://doi.org/10.1063/1.5045560	journal	December 2018
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
Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements Perseo, Valeria; Gradic, Dorothea; König, Ralf Review of Scientific Instruments, Vol. 91, Issue 1 https://doi.org/10.1063/1.5126098	journal	January 2020
First results from divertor operation in Wendelstein 7-X Pedersen, Thomas Sunn; König, Ralf; Krychowiak, Maciej Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aaec25	journal	November 2018
Drift effects on W7-X divertor heat and particle fluxes Hammond, K. C.; Gao, Y.; Jakubowski, M. Plasma Physics and Controlled Fusion, Vol. 61, Issue 12 https://doi.org/10.1088/1361-6587/ab4825	journal	October 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
Measurement and modeling of magnetic configurations to mimic overload scenarios in the W7-X stellarator Lore, J. D.; Gao, Y.; Geiger, J. Nuclear Fusion, Vol. 59, Issue 6 https://doi.org/10.1088/1741-4326/ab18d1	journal	May 2019
First divertor physics studies in Wendelstein 7-X Sunn Pedersen, T.; König, R.; Jakubowski, M. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab280f	journal	July 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
Features of near and far scrape-off layer heat fluxes on the Wendelstein 7-X inboard limiters Niemann, H.; Jakubowski, M. W.; Effenberg, F. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab472c	journal	November 2019

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