Multi-Anode ReadOut Chip for MaPMTs: MAROC3 MEASUREMENTS MAROC3 architecture Trigger measurements Charge measurements Summary P. Barrillon, S. Blin, C. de La Taille IN2P3/LAL Orsay,France

MAROC2: Experiments and applications Specifications Variable gain preamplifier 0-4 to correct PM non uniformity 100% trigger efficiency at 1/3 p.e (= 50fC) Qmax = 5pC (=30 p.e) Noise ~ 2fC Linearity ~ 2% Cross talk : ~ 1% Main Application: ATLAS Luminometer (absolute measurement of the luminosity) 200 readout chips Other applications: ATLAS LUCID: Bologna, 10 chips Double Chooz: Nevis USA, 150 chips PET imaging with PMT64: ISS Roma, 30 chips Tracking detector: Nevod laboratory Russia, 100 chips Medical imaging with SiPM matrixes: INFN Pisa, 2 test boards Memphyno Hodoscope: APC, 4 test boards Roman Pots: 0.5mm2 scintillating fibers 1 Roman Pot = 10*64 fibers in U + 10*64 fibers in V Multi Anode PM Tubes 64ch Hamamatsu H7546 HV = 800-950 V Gain 3.105-106 1-3 non uniformity

Sylvie BLIN - blin@lal.in2p3.fr MAROC 3 – Main Features Almost pin/pin compatible Internal reference Gain adjustement: 8 bits (2,1,…,0.0156) instead of 6 bits (2,1,…,0.0625) Charge measurement Variable charge gain Dynamic range increased 8 or 10 or 12 bits wilkinson ADC Trigger measurement Bipolar fast shaper: 2 thresholds Only 2 DAC Mux instead of an encoder 2 OR outputs New digital output levels: Vhigh and Vlow Mask Technology: AMS SiGe 0.35 mm Package: CQFP240 Area: 16 mm2 Power consumption: 220mW (  3.5mW/channel) 30/09/2009 Sylvie BLIN - blin@lal.in2p3.fr

Fast shaper pedestals Mean=1.926V Rms=1.5mV Mean=1.005V Rms=1.2mV Noise (mV) No Cf Cf = 150 fF Gain = 1 1.0 0.9 Gain = 64 2.6 1.6 Gain = 128 9.6 4.1 Mean=1.005V Rms=1.2mV Noise (mV) No Cf C= 20 fF C= 40fF C= 60 fF Gain = 1 0.92 0.9 0.89 Gain = 64 3.3 2.75 2.55 2.41 Gain = 128 154 5.57 4.72 4.36

10-bit DAC linearity DC_FSB DC_FSU

Scurves with FSB1 One channel: Cf=150fF Slope inverse = 2.4V/pC Intercept ~ 1.920V

Scurves with FSU One channel: Cf=60fF Slope inverse = 4.3V/pC Intercept ~ 0.995V

Gain adjustment: scurves with FSB1

Gain adjustment: scurves with FSU

Trigger Cross talk FSB FSU 50% trigger efficiency Cross talk ch8 47fC 3.1pC 1.5% ch9 2.9pC 1.6% FSU 50% trigger efficiency Cross talk ch8 48fC ch7 5.1pC 0.9% ch9 4.8pC 1%

Wilkinson calibration Tmax (µs) Vmax (mV) Data (adc unit) Start_counter (µs) LSB (µV/adc unit) 0pC 17.8 164 259 11.325 250 0.1pC 19.6 181 353 10.775 240 0.5pC 26.8 252 639 10.825 243 1pC 34.8 334 957 10.875 247 5pC 74.4 732 2544 10.8 249 10pC 84 826 2930 10.75 50pC 94.4 920 3345 246 Vref_ramp=871mV Mean start_counter=10.8µs Vramp at 10.8µs=969mV Mean LSB=246µV/adc unit Conversion equation: V[mV]=data*LSB[mV/adc]+969[mV]

Charge measurements: Slow shaper pedestal Hold2 ADC data <>= 271 count - s= 1.9 count =1.036V =0.47mV DC level <>= 1.047V - s= 1.6mV

Charge measurements: Slow shaper waveforms via wilkinson ADC and linearity Digital conversion at different hold delay Slope: 23.35 adc/pC Slope: 214.9 adc/pC Slope: 636.48 adc/pC Gain 4 8 16 32 40 64 Slope (adc count/pC) 35 70 148 305 383 636 Intercept (adc count) 271 269 265 262 Fit limit (pC) 30 20 10 5 3 Hold delay : 85ns

Summary MAROC3 Third version of MAROC has showed nice performances Test board: Sophia-Antipolis Géosciences Azur : Geoscience tomography with cosmic muons, Micromegas-bulk, 54 chips University of new Hampshire: Positron Resolution in Lanthanum Bromide Scintillators using MaPMT CSNSM: Gamma-ray localization in a monolithic LaBr3 scintillator Available chips: 1250 chips MAROC3 inputs number 64 polarity negative outputs triggers 64 triggers charge 1 analog multiplex 1 digital charge (12, 10 or 8 bits) PA Gain variable 8 bits (0 to ~4) BFS Gain 4.5V/pC Noise 1.6mV Min charge 5fC UFS 2.3V/pC 2.4mV 3fC Slow shaper 156.7mV/pC (gain64) – 4pC 0.53mV