The BA-1 BA Glass
Twin-Tungsten Filament TubeThe BA-1 BA Glass
Twin-Tungsten Filament TubeThese glass tubes use two independent tungsten filaments. This type of tube is often used with ion implantation equipment. Tungsten filaments operate at a relatively high temperature in order to produce the required electron emission because of tungsten's relatively high work function. NIST tests on this tube type show superior long term stability and low tube-to-tube variation in gauge factor. Should one filament burn out in operation, the other filament may be used without requiring a break in the vacuum to change the tube. The nominal gauge factor for these tubes is 11.5/Torr.
In the drawing the pins for filament 1 are labeled F1, the pins for filament 2 are labeled F2, and the ends of the grid are attached to the pins labeled G. The ion collector wire passes through the top of the tube. To connect this tube to the IGC-10 Ion Gauge Control use cable CBL-2.
BA-1/.75 Twin-Tungsten Glass Tube, uncalibrated, with 0.75" D glass tubulation: $90.00
BA-1/1 Twin-Tungsten Glass Tube, uncalibrated, with 1" D glass tubulation: $90.00
BA-1/.75/K Twin-Tungsten Glass Tube, uncalibrated, with 0.75" D Kovar sleeve tubulation: $100.00
BA-1/1/K Twin-Tungsten Glass Tube, uncalibrated, with 1" D Kovar sleeve tubulation: $100.00
BA-1/C Twin-Tungsten Glass Tube, uncalibrated, with 2-3/4" ConflatŪ flange: $170.00
BA-1/KF25 Twin-Tungsten Glass Tube, uncalibrated, with NW 25 fitting: $170.00
BA-1/.KF40 Twin-Tungsten Glass Tube, uncalibrated, with NW 40 fitting: $170.00
BA-1/.75/CERT Twin-Tungsten Glass Tube, calibrated traceable to NIST, with 0.75" D glass tubulation: $390.00
BA-1/1/CERT Twin-Tungsten Glass Tube, calibrated traceable to NIST, with 1" D glass tubulation: $390.00
BA-1/.75/K/CERT Twin-Tungsten Glass Tube, calibrated traceable to NIST, with 0.75" D Kovar sleeve tubulation: $400.00
BA-1/1/K/CERT Twin-Tungsten Glass Tube, calibrated traceable to NIST, with 1" D Kovar sleeve tubulation: $400.00
BA-1/C/CERT Twin-Tungsten Glass Tube, calibrated traceable to NIST, with 2-3/4" ConflatŪ flange: $470.00
BA-1/KF25/CERT Twin-Tungsten Glass Tube, calibrated traceable to NIST, with NW 25 fitting: $470.00
BA-1/.KF40/CERT Twin-Tungsten Glass Tube, calibrated traceable to NIST, with NW 40 fitting: $470.00