FCALPMT
From GlueXWiki
PMT specifications
see also NIM A332(1993)419-443
- The PMT are russian made 12-Stage tubes of the type FEU-84-3 with a 30mm diameter SbNa-KCs cathode
- Maximum gain 2.4*10^5
- Entrance window Borosilicate glass
- 70% SiO2
- 10% B2O2
- 8% Na2O
- 8% K2O
- 1% CaO
- Fractional weight:
- B 0.040064
- O 0.539562
- Na 0.028191
- Al 0.011644
- Si 0.377220
- K 0.003321
- Density = 2.23 g/cm³
- The tube outer diameter is 1.339" or 34.01mm and are about 100mm long (without the pins)
- The current desing of the base has an outer diameter of 1.5" or 38.1mm with an length of about 157mm including the PMT-connector ring and the aluminum end cap.
- The quantum efficiency is about 21% with a sigma of 3%
- The peak sensitivity is around 400nm
- The PMT base will be a Cockroft-Walton based design. Its temperature sensitivity have been investigated [PDF document]
