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A High-tech Trigger hodoscope with MPPC and Peltier devices

Cosmic-ray trigger hodoscope for the EUDET TPC test facility at DESY, Hamburg. 3 modules of 5, 4 and 3 slabs to define the TPC acceptance. It has to work in a 1T magnetic field. A High-tech Trigger hodoscope with MPPC and Peltier devices.

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A High-tech Trigger hodoscope with MPPC and Peltier devices

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  1. Cosmic-ray trigger hodoscope for the EUDET TPC test facility at DESY, Hamburg. 3 modules of 5, 4 and 3 slabs to define the TPC acceptance. It has to work in a 1T magnetic field. A High-tech Trigger hodoscope with MPPC and Peltier devices Slab with its U-shape grove ready to receive a 1mm diameter Kuraray Y11 WLS fibre (INR Moscow). The dimensions are 875x167x7 mm3 Hamamatsu 100-pixel MPPC The 5-slab module being assembled. The MPPC feet are in thermal contact with the copper rod, itself in contact with Peltier devices. T. CHAMINADE 1), P. COLAS 1) , E. DELAGNES 1),M. KAROLAK 1) , Y. KUDENKO 2) , T. MATSUDA 3) F. PIERRE 1) , J.-M. REYMOND 1) , M. RIALLOT 1) , F. SENÉE 1) , S. TURNBULL 1) Irfu,CEASaclay; 2)INR Moscow; 3) KEK Contact: Paul.Colas@cea.fr Each slab is read out by a card : the analogic sum of the 2 MPPC signals is amplified with a gain 40 Signals corresponding to 1, 2, 3 photo-electrons. The temperature was 20°C and the diode bias was 69 V The amplitude of the amplified signal is 50mV per photo-electron. Measured coincidence rate for 2 slabs on top of each other (the plateau is at 21Hz as expected), compared to the calculated fake rate from singles,as a function of the threshold. The setup is operational and perfectly stable since July 2008 at the EUDET facility in DESY, Hamburg.

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