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Performance of new crystal cathode pressure gauges for long-pulse operation in the Wendelstein 7-X stellarator
Review of Scientific instruments ( IF 1.587 ) Pub Date : 2019-12-17 , DOI: 10.1063/1.5121203
Uwe Wenzel, Georg Schlisio, Matthias Mulsow, Thomas Sunn Pedersen, Martin Singer, Mirko Marquardt, Dirk Pilopp, Nils Rüter

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.
更新日期:2019-12-31

 

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