Open AccessTIME-OF-FLIGHT STUDIES OF ELECTRONS IN VACUUM
Author(s) -
Daniel Labar,
J. A. Harter,
R.D. Birkhoff
Publication year - 1964
Language(s) - English
Resource type - Reports
DOI - 10.2172/4051923
Subject(s) - electron , atomic physics , electron gun , cathode ray , amplifier , physics , attenuation length , attenuation , beam (structure) , scattering , optics , nuclear physics , optoelectronics , cmos
An electron gun, drift tube, and fast amplifier (described) were designed and tested as part of a time-offlight electron beam monochromator. Drift time distributions were obtained for electrons of mean energy from 3 to 15 ev, which required mean transit times from 800 to 350 nsec, respectively, with the latter minimum value corresponding to the effects of amplifier rise time and pulse width from the avalanche transistor pulser. The former value corresponds to an electron energy spread from the electron gun of about 0.6 ev. The reciprocal of the square of the transit time is a linear function of the electron gun accelerating potential with an intercept at -- 1.5 v attributed to contact potentials. Beam attenuation due to scattering off of residual gas in the vacuum system indicated that pressures below 10/sup -6/ mm Hg are required in order to avoid loss of electrons in drift distances of the order of one meter. (auth