SiPM readout ASIC for CTA N. Fouque, R. Hermel, G. Lamanna, F. Mehrez, J.L. Panazol, J. Prast, S. Rosier LAPP Annecy le Vieux

The Hamamatsu matrix under test at LAPP Photodetector (not final yet) 4x4 SiPM matrix (16 3x3 mm² pixels) Possible sources for SiPMs – Hamamatsu (currently in test at LAPP) – Excelitas – BKF – Others ? LAPP team, April 12, Some measurements Performed on LAPP testbench

The Hamamatsu matrix Measurement on 16 pixels - 4x4 SiPM matrix (16 3x3 mm² pixels) LAPP team, April 12, 20133

Measurement on 16 pixels - 4x4 SiPM matrix (16 3x3 mm² pixels) At LAPP, with the LAPP test bench, Using the HESS readout system Photoelectron ranging from : 371 to 490 (AD counts) for HV=72 Volts Spread ~ 10 % Temperature ~25 degrees LAPP team, April 12, Measurement on the 16 pixels matrix : gain spread

ASIC specifications Shower detection down to 10 GeV 16 readout channels – 1 p.e. measurement with S/N  5 – 2000 p.e. full scale (1 or 2 gains : TBD) – On-chip programmable gain adjustment – On-chip DAC for pixel overvoltage adjustment – Trigger : Fast discriminator with programmable threshold Time coincidences (sub-ns) – Interface with DRAGON / NECTAR – + Service functions : Bandgap, Slow control registers, DACs, … LAPP team, April 12, 20135

Work in progress at LAPP SiPM characterization – Gain, gain uniformity, noise, temperature effects, Xtalk, … – Electric modeling ASIC design – Just beginning (PhD student since february 2013) AMS SiGe 350nm BiCMOS technology First prototype foundry foreseen end 2013 Main microelectronics past activities of the LAPP team : – AMS ECAL FE chip (2005) – 64 channels mixed A/D ASIC for multi Anode PMT readout (2010) for POLAR with OMEGA/IN2P3 LAPP team, April 12, 20136