Scraper Element Observations in the W7-X Stellarator
POSTER
Abstract
We report on plasma interactions with the new graphite scraper element in Module 5 of the Wendelstein 7-X stellarator during the recent OP1.2b campaign in 2018. Infrared and filtered visible imaging [1], spectroscopy, Langmuir probes and thermocouples provide a suite of measurements to compare a variety of plasma configurations, including a specially designed “high-beta mimic” configuration to put up to 10 MW/m^2 on the scraper element. Additionally, we looked for localized low-level hot spots with the new high-resolution IR capability, due to expected localized lost fast hydrogen ions injected from the new neutral beam injection (NBI) system.
[1] G. A. Wurden, et al, Rev. Sci. Instruments 2018
*Supported by the US-DOE/IPP collaboration under DOE LANS Contract DE-AC52-06NA25396, and carried out within the framework of the EUROfusion Consortium, with funding from the H2020 Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
Presenters
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Glen A. Wurden
- Los Alamos National Laboratory