layers

Original SOS Cerenkov 05/17/06

A description of the original SOS Cerenkov (1 atm Freon-12) is given below. Thanks to Hamlet for supplying this information. This information does not apply to Peter's SOS gas Cerenkov.

Window-to-window length
Width
Height

Window (front and back) materials

Window (front and back) thickness
Gas
Gas thickness

n
Electron threshold
Pion threshold

Entrance window

111 cm
73.7 cm
99 cm

254 um Lexan graphics film covered
with 50.8 um Tedlar film
39 mg/cm2
Freon-12 (CCl2F2) at 1 atm
530 mg/cm2

1.00108
11 MeV
3 GeV

11" high, 24" wide and 12" half circles above and below

PMT description:

The Cerenkov light is reflected onto four PMT Burle-8854 by four spherical
mirrors. Each PMT has a Winston cone (a reflective cone around the tube
face) to increase the effective solid angle of the tube. At nominal
conditions we usually get for relativistic electrons about 10-11
photoelectrons (the sum from all PMT's).























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