München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 21: Postersitzung

HK 21.66: Poster

Dienstag, 21. März 2006, 15:30–17:00, P

Development of front-end electronics for the kaon spectrometer at MAMI — •Carlos Ayerbe Gayoso, Patrick Achenbach, and Mar Gomez Rodriguez de la Paz — Inst. für Kernphysik, Universität Mainz, 55099 Mainz

The new focal plane detector for the kaon spectrometer at MAMI presents the challenge to read out near to 4000 fibre channels keeping modularity and compactness. For this a 12 layer motherboard able to accommodate three 32 channel multianode photomultipliers with minimum time jitter was designed. It includes the low voltage power line supply for the Cockroft-Walton voltage multiplier bases of the photomultipliers, the RJ-45 connectors for analog output to the discriminators and, in the future, APV front-end chips for amplifying, sampling and multiplexing the signal amplitudes.

A 32 channel discriminator board based on the double threshold principle for amplitude compensated timing was designed with the LVDS output signals being compatible with COMPASS electronics.

Timing measurements are done with TDC CATCH mezzanine cards, the trigger will be derived with a FPGA based VME logic module protyped in 2005, and the signal amplitude with 12/16 channel ADC cards via GeSiCa.

A similar approach for the signal amplitude read-out of the MWPCs for the kaon spectrometer has been chosen.

Work supported by Deutsche Forschungsgemeinschaft (SFB 443).