Investigation on low pressure limit of Bayard-Alpert gauge

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5653528

Chou, T S; Lanni, C; Tang, Z Q

In order to extend the pressure measurement of devices used in most UHV applications to the lowest limit possible, several commercial Bayard-Alpert gauges have been modified. These modified gauges have been inserted into a stainless steel tube with an I.D. of 1-3/4 inches (44.5 mm), which will act as an outer casing for the gauge. A hairpin filament, instead of a commercial helical filament, has been used in this experiment for its accuracy in positioning the filament to improve the gauge performance. In this paper, the characteristics of this modified gauge will be discussed. This includes the variations of the gauge sensitivity on applied voltage and position of the filament. The quantities of the normal and reverse x-ray photo current and possibility of self-modulation will be presented. From the results of this study, the potential of this gauge to measure pressures down to 10/sup -13/ Torr range with lower emission current is strongly indicated.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5653528
• Report Number(s): BNL-33743; CONF-831171-9; ON: DE84002578
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420700 -- Engineering-- Vacuum Engineering-- (-1987)
440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
BAYARD-ALPERT GAGES
CURRENTS
DESIGN
ELECTRIC CURRENTS
IONIZATION GAGES
LIMITING VALUES
MEASURING INSTRUMENTS
MODULATION
PHOTOCURRENTS
PRESSURE GAGES
SENSITIVITY
VACUUM GAGES