Performance of LaB6-Emitters for Neutral Gas Pressure Gauges During Plasma Operation in the Large Helical Device

被引：0

作者：

Haak, Victoria ^{[1
]}

Motojima, Gen ^{[2
]}

Jagielski, Bartholomaus ^{[1
]}

Naujoks, Dirk ^{[1
]}

Graband, Andreas ^{[1
]}

Pilopp, Dirk ^{[1
]}

机构：

[1] Max Planck Inst Plasmaphys Greifswald, D-17491 Greifswald, Germany

[2] Natl Inst Fus Sci, Gifu 5095202, Japan

来源：

IEEE TRANSACTIONS ON PLASMA SCIENCE | 2024年 / 52卷 / 09期

关键词：

Annealing; boron compounds; cathodes; current measurement; deuterium; emission; lanthanum compounds; neutron radiation effects; pressure measurement; thermionic emission; HIGH-TEMPERATURE OXIDATION; LANTHANUM HEXABORIDE;

D O I：

暂无

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

With the aim of providing precise and reliable neutral gas pressure measurements in plasma experiments, several types of neutral gas pressure gauges using LaB6-emitters were tested at the Large helical device (LHD) during the last four experimental campaigns. A significant failure rate of the neutral gas pressure gauges could be observed. While the reasons are still unclear, correlations between the failure of LaB6-emitters and deuterium plasma operation with neutron generation have been discovered and are discussed here. Activation of the LaB6-emitters at a higher heating current than during standard operation was carried out during the campaign as an attempt to improve their thermionic emission properties and resulted in changes to the surface structure that were detected by scanning electron microscopy.

引用

页码：3511 / 3515

页数：5

共 3 条

[1] Performance of LaB6-Emitters for Neutral Gas Pressure Gauges During Plasma Operation in the Large Helical Device
Haak, Victoria
Motojima, Gen
Jagielski, Bartholomaeus
Naujoks, Dirk
Graband, Andreas
Pilopp, Dirk
IEEE TRANSACTIONS ON PLASMA SCIENCE, 2024, : 1 - 5
[2] Performance of ITER pressure gauges during deuterium operation in the large helical device
Wenzel, Uwe
Motojima, Gen
Mackel, Felix
Arkhipov, Alexey
Jagielski, Bartholomew
Haak, Victoria
Meister, Hans
Marquardt, Mirko
Fox-Widdows, Ella
PLASMA PHYSICS AND CONTROLLED FUSION, 2024, 66 (12)
[3] Operation of the negative ion-based neutral beam injection system during Large Helical Device experimental campaigns
Oka, Y
Kaneko, O
Takeiri, Y
Tsumori, K
Osakabe, M
Ikeda, K
Asano, E
Kawamoto, T
Akiyama, R
Hamabe, M
FUSION ENGINEERING AND DESIGN, 2001, 56-57 : 533 - 537

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