Ionization Gauge for Transient Gas Pressure Measurements

Abstract

A gauge has been developed that is particularly suited for measuring transient gas pressures (e.g., gas bursts expanding in vacuum). A commercial subminiature pentode has been used in a suitable circuit for this purpose. Calibration curves for helium, nitrogen, neon, argon, krypton, and xenon at room temperature are given in the 1 to 400 μ Hg range. The features of this gauge are its small size, short risetime, and simple construction and installation. The serious disadvantage is its short lifetime, about 3 weeks of continuous use, mainly due to filament failure.

Design and construction details of the FRX-C/T device: a compact toroid plasma translation experiment

“…Transient neutral gas distributions are measured using a CK5702 tetrode, fast-ionization gauge. 8 Typical measured p(z,t) axial D 2 pressure profiles from side-on injection are plotted in Fig. 16.…”

Measurement of transient neutral gas puff pressure in the NUDT_IPPTx by a fast ionization gauge

“…Typical ionization gauges are designed to monitor the base pressure of high-vacuum systems at a steady state, and are consequently too slow to measure the transient pressure, too large to achieve good spatial resolution, and incapable of operating over 10 −4 Torr [11]. As early as 1966, an ionization gauge based on commercial pentodes was used for transient gas pressure measurement [12]. Since then, similar ionization gauges have been widely and successfully used for measuring the density profile of the gas puff injected by supersonic nozzles [13][14][15][16].…”

Experimental study of force-free, collinear plasma structures

“…A static mode in which the vacuum chamber is raised to a desired pressure by means of a bleed valve, and a pulsed mode in which gas is introduced into the system by means of gas valves located at the extreme ends of the vacuum chamber. Measurements of the gas distribution as a function of time for the pulsed mode were made using the techniques developed by Marshall and others (Marshall 1960;Small 1968;Valsamakis 1966). Timing of the pre-ionization discharge was determined by measurements of the gas pulse profiles.…”