A source for a high-intensity pulsed beam of metastable helium atoms

被引：58

作者：

Halfmann, T ^{[1
]}

Koensgen, J ^{[1
]}

Bergmann, K ^{[1
]}

机构：

[1] Univ Kaiserslautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany

来源：

MEASUREMENT SCIENCE AND TECHNOLOGY | 2000年 / 11卷 / 10期

关键词：

metastable-atom source; atomic beam; metastable helium; injection seeding; electrons; pulsed discharge;

D O I：

10.1088/0957-0233/11/10/312

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The operational characteristics and technical details of a high-intensity discharge source for a pulsed beam with a high flux of helium atoms in their metastable states (exceeding 4 x 10(15) atoms sr(-1) s(-1)) are discussed. Owing to the high ionization potential of helium, stable operation of a pulsed discharge in an atomic beam is difficult to achieve. In this work we describe a simple, robust and easy-to-operate design of a reliable high-intensity pulsed source for metastable helium atoms. The principle of operation relies on injection seeding the discharge with electrons emitted from a hot wire, permitting a strong enhancement both in efficiency and instability of the production of metastable atoms.

引用

页码：1510 / 1514

页数：5

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