Optimization of a Langmuir-Taylor detector for lithium

Details Optimization of a Langmuir-Taylor detector for lithium Optimization of a Langmuir-Taylor detector for lithium

2002-03-13

arxiv.org/abs/physics/0203037v1

Physics

Instrumentation and Detectors

11 pages, 7 figures, to appear in Rev. Sci. Instrum

Scientific paper

10.1063/1.1472467

This paper describes the construction and optimization of a Langmuir-Taylor detector for lithium, using a rhenium ribbon. The absolute detection probability of this very sensitive detector is measured and the dependence of this probability with oxygen pressure and surface temperature is studied. Sources of background signal and their minimization are also discussed in details. And a comparison between our data concerning the response time of the detector and literature values is given. A theoretical analysis has been made: this analysis supports the validity of the Saha-Langmuir law to relate the ionization probability to the work function. Finally, the rapid variations of the work function with oxygen pressure and temperature are explained by a chemical equilibrium model.

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