| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 6744257 | Fusion Engineering and Design | 2017 | 4 Pages |
Abstract
With the change from carbon to tungsten plasma-facing components (PFCs) an enhanced Helium (He) content at plasma discharges was observed for unboronized walls and the implantation of He during GD could be identified as source. For this reason the use of He GD has to be strongly reduced. It turned out that pulsed GDs of about 10Â s length followed by a pumping down phase are sufficient to clean the wall. This mode of operation requires a reliable breakdown of the GD at operating pressure. This paper gives an overview of the technical setup and first measurement results.
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Authors
Thomas Härtl, Aleksander Drenik, Michael Kircher, Volker Rohde, Franz Stelzer, Wolfgang Zeidner, ASDEX Upgrade team ASDEX Upgrade team,