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FIWAF 10/2002 Pierre COLIN
a measurement of the fluorescence light in UV emitted by various gas (air, pure N2...) when high-energy charged particles pass through it.
What ?
Who ?LAPP (Annecy France) :P. Colin, J.P Mendiburu, D. Naumov, P. Nedelec and J.P. Peigneux.
Other groups involved / interested:ISN (France), APC (France), LIP (Portugal), CERN. and who wants to join us !
Measurement At Cern of Fluorescence Light Yield
CERN test beam ( PS and SPS line ) Where ?
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FIWAF 10/2002 Pierre COLIN
•Pressure ( 0 to 1 atm )• Temperature• Air composition (O2, Ar…) • Impurities (humidity, aerosol…)• Energy of particles (1.4MeV to 100GeV)• Nature of high-energy particle (e-
,,p…)
• Presence of Cerenkov light
The purpose: Measure air light yield as a function of:
Simulate the UV light produced by an air shower in the atmosphere.
Pressure and temperature profile of atmosphere
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FIWAF 10/2002 Pierre COLIN
CERN Test beam facilities:• Particle beam of electron, pion or proton.• Flux : 10,000 particle/spill.
Control room
DAQ
UV laser
CERN-SPS-X5 Test Beam line
e-, beam
Experimental area
Line Energy Frequency
PS 5-15 GeV 1spill / 2s
SPS 25-100 GeV 1spill / 14s
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FIWAF 10/2002 Pierre COLIN
Setup :
beamPMT
1m
Pressurised tank
mirrors
PMT
beam
Quartz window
PMT
• We control temperature,pressure and gas composition in the tank.• Mirror system collects the light (geometric efficiency: 57% ).• several PMT detect the light ( with or without filters ).• First simulation:
in dry air at atmospheric pressure:104 particles 3570 photoelectrons detected.
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FIWAF 10/2002 Pierre COLIN
Schedule :
From Now
to end of the year
Setting up :
A device to measure fluorescence yield
A simulation of this device
Beginning of 2003 First test with:
Radio active source (1.4MeV reference point).
337nm UV LASER.
Summer 2003 Measurement at CERN under test beam.
Summer 2004 Last measurement with test beam.
Contact us : [email protected]
And first result at the next workshop…
