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Probe manipulators for Wendelstein 7-X and their interaction with the magnetic topology

Plasma Science and Technology 2018年第5期20卷 6-17页

作者： M RACK D HOSchEN D REITER B UNTERBERG J W COENEN S BREZINSEK O NEUBAUER S BOZHENKOV G CZYMEK Y LIANG M HUBENY ch linsmeier the Wendelstein 7-X Team Forschungszentrum Julich GmbH Institut für Energie- und Klimaforschung-Plasmaphysik Partner of the Trilateral Euregio Cluster (TEC) D-52425 Julich Germany JARA-HPC D-52425 Julich Germany Max-Planck-Institut für Plasmaphysik D-17491 Greifswald/D-85748 Garching Germany

Probe manipulators are a versatile addition to typical plasma edge *** with material samples they allow for detailed investigation of plasma–wall interaction processes,such as material erosion,deposition or impurity transport *** combined with electrical probes,a study of scrape-off layer and plasma edge density,temperature and flow profiles as well as magnetic topologies is possible.A mid-plane manipulator is already in operation on Wendelstein 7-X.A system in the divertor region is currently under *** the present paper we discuss the critical issue of heat and power loads,power redistribution and experimental access to the complex magnetic topology of Wendelstein *** the aforementioned aspects are of relevance for the design and operation of a probe manipulator in a device like Wendelstein？7-X.A focus is put on the topological region that is accessible for the different coil current configurations at Wendelstein 7-X and the power load on the manipulator with respect to the resulting different magnetic *** analysis of power loads on plasma-facing components is performed using a numerical tracer particle diffusion tool provided via the Wendelstein 7-X Webservices.

关键词： stellarators Wendelstein 7-X manipulator divertor power load

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Argon-seeded plasma exposure and oxidation performance of tungsten-chromium-yttrium smart alloys

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Tungsten 2019年第2期1卷 159-168页

作者： Janina Schmitz Andrey M.Litnovsky Felix Klein Xiaoyue Tan Uwe Breuer Marcin Rasinski Stephan Ertmer Arkadi Kreter Jesus Gonzalez-Julian Martin Bram Jan Willem Coenen christian linsmeier Forschungszentrum Juelich GmbH Institut fuer Energie-und Klimaforschung52425 JuelichGermany Department of Applied Physics Ghent University9000 GhentBelgium School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Forschungszentrum Juelich GmbH Institut fuer Engineering und Analytik52425 JuelichGermany

Tungsten-chromium-yttrium(WCrY)smart alloys are foreseen as the first wall material for future fusion devices such as Demonstration Power Plant(DEMO).While suppressing W oxidation during accidental conditions,they should behave like pure W during plasma operation due to preferential sputtering of the lighter alloying elements Cr,Y,and W enrichment of the *** this paper,the erosion performance of WCrY and W samples simultaneously exposed to deuterium(D)plasma with the addition of 1%of the projectile ions being argon(Ar)ions at an ion energy of 120 eV is *** reference to the previous experiments at 120 eV in pure D plasma,the erosion for both WCrY and W is enhanced by a factor of~*** Ar to the D plasma suppresses significant W enrichment previously found for pure D *** investigate the impact of the plasma exposure onto the oxidation performance,plasma-exposed and non-exposed reference samples were oxidised in a dry *** show,on the one hand,that the oxida-tion suppression of WCrY in comparison to pure W is preserved during the plasma *** the other hand,it becomes evident that edge effects imposed by the geometry of the samples used in plasma experiments play a significant role for the oxidation behaviour.

关键词： Tungsten-based alloys Plasma-facing material Smart alloys DEMO

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Spectroscopic studies of fuel recycling and impurity behaviors in the divertor region of Wendelstein 7-X

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Plasma Science and Technology 2019年第10期21卷 17-27页

作者： Yanling WEI Erhui WANG Yunfeng LIANG Southwestern Institute of Physics Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung—PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC) Max Planck Institute for Plasma Physics Australian National University

The first divertor operation phase (OP1.2a) was carried out on Wendelstein 7-X in the second half of 2017. Fuel recycling and impurity behaviors in the divertor region were investigated by employing a newly built ultraviolet–visible–near infrared overview spectroscopy system. The characteristic spectral lines of the working gases (hydrogen and helium), intrinsic impurities (carbon, oxygen and iron), and seeded impurities (neon and nitrogen) were identified and analyzed. The divertor electron temperature and density were measured using He I (667.8, 706.5, and 728.1 nm) line intensity ratios. The Hα(656.3 nm), He I (587.6 nm), C II (514.5 nm), and O I (777.2 nm) emissions were investigated over a wide range of operating conditions. The results showed that fuel and impurity emissions in the divertor region exhibit a strong dependence on magnetic topology and plasma conditions. The levels of Hα, He I, C II, and O I emissions are all reduced moving from the standard configuration to the high mirror configuration, and even further reduced for the high iota configuration, which is associated with decreasing connection length in these island divertor configurations. The H/He influx ratio shows that the plasma is a mixture of helium and hydrogen. The neutral and impurity influxes from the divertor target tend to increase with increasing divertor electron temperature.

关键词： spectroscopy diagnostic fuel recycling impurity

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