Wenzel Uwe, Schlisio Georg, Mulsow Matthias, Pedersen Thomas Sunn, Singer Martin, Marquardt Mirko, Pilopp Dirk, Rüter Nils
Max Planck Institute for Plasma Physics, Wendelsteinstrasse 1, 17491 Greifswald, Germany.
Rev Sci Instrum. 2019 Dec 1;90(12):123507. doi: 10.1063/1.5121203.
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 LaB 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.
为提高文德斯坦7-X托卡马克装置等离子体容器中ASDEX压力计的可靠性，首次对其中九个压力计配备了LaB晶体电子发射器。这些晶体阴极压力计在2018年的最后一次运行（运行阶段1.2b）中，在约2.1 T的磁场中仅以2 A的加热电流运行了40多个小时，没有出现故障。由于性能出色，我们决定在文德斯坦7-X的下一次运行（运行阶段2）中为所有压力计配备晶体阴极。我们报告了在超导磁体中的预测试，展示了文德斯坦7-X中的中性压力测量，并证明了晶体阴极压力计的长期稳定性。
