Hairpin-filament electron guns for low-energy use

Autor:	L Boesten, K Okada
Rok vydání:	2000
Předmět:	Physics Physics::Instrumentation and Detectors Applied Mathematics Rotational symmetry Laminar flow Electron Space charge Anode Acceleration Wehnelt cylinder Electron optics Atomic physics Instrumentation Engineering (miscellaneous)
Zdroj:	Measurement Science and Technology. 11:576-583
ISSN:	1361-6501 0957-0233
Popis:	A long series of simulations of hairpin-filament guns as used in electron spectrometers was performed for filament-anode distances from 2 to 10 mm and acceleration voltages from 10 to 100 V using Child's law approximation, space-charge effects and rotational symmetry. The role of the Wehnelt electrode is clarified. Two distinct operation modes, the laminar (with positive Wehnelt voltages) and scrambled (with negative Wehnelt voltages) modes, are described and, for each, typical equations for the dependence of the current on the filament-anode distance and anode voltages are given.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::58b9e83070b99462bd8e13820821f94c https://doi.org/10.1088/0957-0233/11/5/319 Zobrazit plný text záznamu