First prototype of the muon telescope
The first prototype telescope was built using available PS scintillator bars, PMTs and bases. A regulable aluminium support was built. The instrumentation was completed with several NIM modules (dual HV power supply, two discriminators and a coincidence module). This two-detector system was mainly used for Atlas TGC studies and characterization (information available in TGC blog).
A simple characterization of the scintillators is available, including light yield and time resolution, compared to our scintillators. There is also a second and final version of this telescope, built using custom made polystyrene scintillator paddles.
15 cm plastic scintillator bars from MINOS/OPERA/AMIGA projects [REF] without fiber optic wavelength shifter.
From AMIGA: The design adopts similar scintillator strips as for the MINOS experiment: 4.1 cm wide x 1.0 cm high strips of extruded polystyrene doped with fluors and co-extruded with TiO2 reflecting coating with a groove in where a wavelength shifter fibre is glued and covered with reflective foil.Scintillator strips are extruded polystyrene doped with fluors: PPO (1%) and POPOP (0:03%). They have a middle groove which lodges a wave length shifter (WLS) fiber: Kuraray Y-11 175 ppm double-clad 1.2 mm diameter which is glued into the groove and covered with reflective foil. The strips are co-extruded with a TiO2 reflective coating which prevents the light from leaving the scintillator.
Detector PMTs and bases
- 2 x Burle 8575 2" photomultiplier tube (PMT) (see datasheet).
- 2 x Fermilab active base for negative high voltage supply (se Hammamatsu manual).
Mounting: polished in both extremes with 1000 sandpaper, one with white reflector (teflon) and the other fixed to the tube with optical grease through a metalic support (see pictures, click on slideshows to see the whole album), covered with aluminium, black goma eva and black tape.
- Two 100 MHz discriminators Ortec 436.
- Coincidence module Ortec CO 4010.
- High voltage dual power supply Ortec 456.
- Canberra 2000 NIM Bin, with +-6V addendum.
- Aluminium regulable guides (see pictures).
- Tektronix 3024B 4 channel 200 MHz osciloscope.