Difference between revisions of "FCALPMT"
From GlueXWiki
(→PMT specifications) |
(→PMT specifications) |
||
| Line 13: | Line 13: | ||
<li> Fractional weight: </li> | <li> Fractional weight: </li> | ||
<ul> | <ul> | ||
| − | <li> B | + | <li> B=0.040064, O=0.539562, Na=0.028191, Al=0.011644, Si=0.377220, K=0.003321</li> |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
</ul> | </ul> | ||
<li>Density = 2.23 g/cm³</li> | <li>Density = 2.23 g/cm³</li> | ||
Revision as of 19:20, 7 December 2007
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
- 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]
