Accession Number : AD0611007

Title :   A Photo-Current Suppressor Gauge for the Measurement of Very Low Pressures,

Corporate Author : ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB

Personal Author(s) : Schuemann,W. C.

Report Date : OCT 1962

Pagination or Media Count : 14

Abstract : An ionization gauge has been designed which removes the low pressure limitation due to x-rays found in conventional ionization gauges while maintaining a comparable sensitivity. In this gauge, an additional electrode establishes an electric field which repels photo-electrons ejected from the ion collector. A similar photo-current from the suppressor grid is prevented by shielding this electrode from the x-rays. Preliminary experimental results have verified the suppression of photo-currents; pressures as low as 2 x 10 to the minus 12th power Torr have been measured. (Author)

Descriptors :   (*IONIZATION GAGES, LOW PRESSURE), (*SUPPRESSORS, IONIZATION GAGES), (*X RAYS, IONIZATION GAGES), PRESSURE GAGES, ELECTROMAGNETIC SHIELDING, ELECTRONS, ELECTRIC CURRENT, PHOTOELECTRONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE