Silicon Photomultipliers for the LHCb Upgrade Scintillating Fibre Tracker

Jun 4, 2014, 5:20 PM
Berlagezaal (Beurs van Berlage)


Beurs van Berlage

Oral Sensors: 1d) Photon Detectors I.d Photon


Guido Haefeli (Ecole Polytechnique Federale de Lausanne (CH))


Silicon photomultipliers (SiPMs) are solid state photo detectors that combine all of the features necessary for the photon detection of a high resolution scintillating fibre tracker. Two SiPM manufacturers, Hamamatsu and KETEK have developed customized devices for SciFi Tracker application in the context of the LHCb tracker upgrade. These custom devices provide high photon detection efficiency (PDE) in a large wavelength range, high reliability due to its simple mechanical construction, a high density multi-channel package and are of sufficiently low cost to build a large area tracking device. There are several challenging requirements placed on the photo-detector mainly due to the neutron radiation environment and the low light output of the long scintillating fibre modules. New devices with the latest technological improvements implemented are available in spring 2014. This includes devices with different optical isolation between pixels (trenches) and different pixel sizes. The dark noise rate (DCR) increases strongly with irradiation and the noise cluster rate of the tracking device can only be kept sufficiently low at a temperature of -40°C. We present the results on PDE, cross-talk and noise before and after neutron irradiation at various temperatures. The results are compared for the latest and the devices based on the standard technology.

Primary author

Guido Haefeli (Ecole Polytechnique Federale de Lausanne (CH))


Fred Blanc (Ecole Polytechnique Federale de Lausanne (CH))

Presentation materials