In this event 240 eV electron is passing through the MICE Cerenkov detector

Definition of the materials in the detector.All numbers have to be carefully checked !!!

Some of them are arbitrary

• Aerogel 1 Density = 0.251*g/cm3

Absorption length = 245.0*mm

Refractive Index = 1.08

Rayleigh scattering length is calculated by the formula :

Where C = 1e-24 m3

4

1

C

Lscat

• Aerogel 2 Density = 0.430 g/cm3

Absorption length = 245.0 mm - the same like in aerogel 1 ?!?!Refractive Index = 1.12

Rayleigh scattering length is calculated by the same formula and is the same like in Aerogel 1 ?!?!

• Optical glass (the material for the Glass window)

Density = 2.6 g/cm3;

Refractive Index = 1.4

The used absorption length is

shown in the graphics

Probably it is not the correct one

No Rayleigh scattering in this material

• Optical PMT glass (the material for the windows of the PMTs)

Density = 2.6 g/cm3;Refractive Index = 1.4No absorption in this material.No Rayleigh scattering in this material

• Optical air (only the vessels of the cerenkov detector are filled with this material)

Density = 1.29 g/cm3;

Refractive Index = 1.0No absorption in this material.No Rayleigh scattering in this material

Energy and wavelength of the photons which hit the PMTs

The time of the hits in the PMTs for Vessel 1 (n=1.08) and Vessel 2 (n=1.12)

Angle of incidence in Vessel 1 (n=1.08) and Vessel 2 (n=1.12)

Number of photon hits per PMT in Vessel 1 (n=1.08)

and Vessel 2 (n=1.12)

Number of photoelectrons in one digit in Vessel 1 and Vessel 2

The time of the first photoelectron in Vessel 1 and Vessel 2

The time of the photoelectron minus the time of the first

Performance of the shaper – the worst case scenario