Supply and loss mechanisms of Ba dispenser cathodes

被引：38

作者：

Gärtner, G ^{[1
]}

Geittner, P ^{[1
]}

Raasch, D ^{[1
]}

Wiechert, DU ^{[1
]}

机构：

[1] Philips Res Labs, D-52066 Aachen, Germany

来源：

APPLIED SURFACE SCIENCE | 1999年 / 146卷 / 1-4期

关键词：

thermionic electron emission; scandate cathodes; top-layer scandate cathodes; Ba dispenser cathodes; Ba BaO evaporation; ion bombardment; dynamic shielding effect;

D O I：

10.1016/S0169-4332(99)00016-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ba dispenser cathodes, especially W-I, Re-I, Os/Ru-I and Sc2O3/Re top-layer Scandate cathodes have been investigated with respect to Ba resupply, Ba evaporation and ion bombardment behaviour. Since a 411 impregnated base was used for all these types, the same Ba evaporation activation energy of 3.15 eV was found despite different surface coatings. These and further results are compared with Literature data. From ion bombardment (= IB) investigations different sputter yields are derived. With respect to IB stress tests, dynamic shielding of the surface complex rest by Ba sitting on top is introduced, which allows the extrapolation of resistivity data to real tube conditions. Information about the Scandate surface complex is evaluated. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：22 / 30

页数：9

共 30 条

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