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.

Plastic scintillators

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.

NIM Instrumentation

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.

Other

Aluminium regulable guides (see pictures).
Tektronix 3024B 4 channel 200 MHz osciloscope.