A Thyratron-Controlled Ionization Gauge

Abstract

A thyratron is used to maintain constant the ionizing electron current in an ionization gauge. A circuit operating entirely from the alternating current supply line is given, together with the constants found suitable in the particular apparatus used and including provision for outgassing the metal parts of the gauge. The thyratron control was found to maintain constant electron current over the usual pressure range and with line voltage fluctuations of ±6 percent.