Reciprocating probe measurements in the test divertor operation phase of Wendelstein 7-X

C. Killer*, P. Drews, O. Grulke, A. Knieps, D. Nicolai, G. Satheeswaran

*Corresponding author for this work

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Abstract

Reciprocating probes are a classic and widespread tool for the investigation of the edge and Scrape-Off Layer of magnetic fusion plasmas. In the Wendelstein 7-X (W7-X) stellarator, the Multi-Purpose Manipulator serves as a multi-user platform for probe measurements of various kinds. This paper presents a review on reciprocating probe operation during the first operation phase of W7-X with a test divertor (2017–2018). It gives an overview of the diverse zoo of probe heads and presents lessons learned about probe operation in complex magnetic geometries, operation safety, and probe head design. A few examples of probe measurements with a focus on unexpected observations are presented, e.g. indications for supra-thermal electrons and the propagation of plasma perturbations due to biased probes.
Original languageEnglish
Article numberP03018
JournalJournal of Instrumentation
Volume17
ISSN1748-0221
DOIs
Publication statusPublished - 2022

Keywords

  • : Plasma diagnostics - probes
  • Ion sources (positive ions, negative ions, electron cyclotron resonance (ECR), electron beam (EBIS))

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