FCALPMT

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
• SiO2, B2O2, Na2O, K2O, AlO
• 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
• refractive indices (1.51–1.54 across the visible range)
• 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]