Performance of new crystal cathode pressure gauges for long-pulse operation in the Wendelstein 7-X stellarator

To improve the reliability of the ASDEX pressure gauges in the plasma vessel of the Wendelstein 7-X stellarator, nine of them were equipped with a LaB6 crystal electron emitter for the first time. These crystal cathode pressure gauges were operated during the last campaign in 2018 (operation phase 1...

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Bibliographic Details
Published in:Review of scientific instruments 2019-12, Vol.90 (12), p.123507-123507
Main Authors: Wenzel, Uwe, Schlisio, Georg, Mulsow, Matthias, Pedersen, Thomas Sunn, Singer, Martin, Marquardt, Mirko, Pilopp, Dirk, Rüter, Nils
Format: Article
Language:English
Subjects:
Cathodes
Crystals
Emitters
Emitters (electron)
Magnetism
Pressure gages
Pressure gauges
Scientific apparatus & instruments
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Summary:To improve the reliability of the ASDEX pressure gauges in the plasma vessel of the Wendelstein 7-X stellarator, nine of them were equipped with a LaB6 crystal electron emitter for the first time. These crystal cathode pressure gauges were operated during the last campaign in 2018 (operation phase 1.2b) with only 2 A heating current for over 40 h in a magnetic field of about 2.1 T without failure. Owing to this excellent performance, we have decided to equip all pressure gauges with crystal cathodes for the next campaign of Wendelstein 7-X (operation phase 2). We report on a pretest in a superconducting magnet, show a measurement of the neutral pressure in Wendelstein 7-X, and demonstrate the long-term stability of the crystal cathode pressure gauges.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5121203