THE MANSON ABSOLUTE PHOTON COUNTING SYSTEM FOR ULTRASOFT X-RAYS
MODEL 04 PHOTON COUNTER
CATHODE (BODY): Nickel plated brass.
The input stage is a JFET-bipolar cascode,
MODEL 2 GAS FLOW CONTROL SYSTEM
GENERAL CONSTRUCTION: Mounted on a standard 19" x 7"- aluminum panel, with brass valves and compression fittings, and 1/4" OD polyethylene and rubber tubinq. The rear panel is punched for alternate mountinq of tubinq connections to the gas supply, exhaust pump, and experiment.
INPUT FLOW RATE: A fixed capillary flow restrictor limits the flow to 5 cc min-1 at NTP from customer's reqglator set at 1 PSI gauge, with the system at 100 Torr.
PRESSURE CONTROL AND EXHAUST: Very fine needle valve in exhaust line establishes stable pressure, balanced against the fixed input flow. System internal volume of 76 cc, including 6' lines and counter, allows rapid equilibration of pressure when re-setting a new value. Exhaust is to customer's small mechanical pump. When using methane or propane, or other explosive gas, the usual precautions must be taken to vent the exhaust line.
PRESSURE INDICATION: Panel mounted modified
vacuum gauge. Scale is manually set to zero
indicated absolute pressure, referenced to the
atmospheric pressure, with the counter and
system evacuated. Scale is calibrated to 400
Torr, +/- 5% of readinq above 40 Torr.