6mm

1. A_Pipeline 48x32ch T_Pipeline 48x32ch Analog MUX D_OUT (discri signal) ch1 ch32 A_OUT (Charge) ch1 Front End Analog MUX ch2 T_OUT(Time) Analog MUX ch32 32chIN → Serial out Signal to Stocks（Deep;1-48） • AMP • Discri signal Trip-t･･･TRIgger and Pipeline with Timing to Logic Analyzer MPPC MountBoard Cable change 40Pin 2line Header pin MPPC Mount socket (10mm space x2) 0 to2.5V D-OUT 32 MPPC 32 PPG Module(VME) 34Pin connector AC 34Pin connector Trip-t 34Pin connector 34Pin connector 32 34Pin connector Con. Sig. DC70V Vth OUTP_A PS1 34Pin connector 68Pin connector Labview system filter PS2 AD827 op Test pin Regulator 40Pin connector 85QLAx2 85QLAx2 ±5V to 2.5V Injection DAQ Board(VME);to ADC 【 Development of Readout Electronics for MPPC 】 Takeshi.Murakami*,Shinichi.Gomi KEK*,Department of Physics, Kyoto University We report the read out electronics of MPPC( Multi-Pixel Photon Counter ). MPPC is a new photodetector developed by Hamamatsu Photonics. Here, we report Trip-t ASIC chips and those electronics. We report the read out electronics, Trip-t Test Board. MPPC and Trip-t chip have been decided to use in T2K experiment. We now test the basic performances of latest MPPC samples, and check the device-by-device variation about many samples with Trip-t Test Board. Trip-t Test Board can be used for reading out signals from 32 MPPC at the same time. MPPC ( Multi-Pixel Photon Counter ) Trip-t readout sequence • Multi-Pixel Photon Counter ( = MPPC ) is a new type of photo detector developed by Hamamatsu Photonics (HPK). • MPPC consists of 100~1600 small avalanche photo diodes( APD ) in 1mm×1mm sensitive region. MPPC SIGNAL(CH1) The injected charge to each channel is amplified by the front-end amplifiers and stored in pipeline before readout. Next the stored signals are serialized to 1 channel by multiplexer which is located at the last stage of Trip-t. Using 1 Trip-t, we can reduce the number of readout channels from 32 to 1. Simply speaking, A_OUT corresponds to the amplitude of input charge, T_OUT corresponds to the timing of input charge and D_OUT corresponds to the digital information of input charge. Pre-AMP RESET 6mm Pre-AMP after MPPC signal • MPPC advantages • Compact • Insensitive to magnetic field • High gain( ~106 ), low bias voltage( ~70V ) • High photon detection efficiency • Excellent photon counting capability 0 1 2 32 1pixel CLOCK(mux) A_OUT MPPC Signal T_OUT D_OUT Sensitive region of MPPC Trip-t chip Pipeline Clock Voltage time VME6U DAQ Board ・ Developed by FNAL ・ Used in D0 experiment ・ Plan to use in T2K experiment and MINERvA experiment ・ Input 32ch Analog signal ( - ) ・ Output VME IF ;FPGA;XC95144XL-TQ144 The DAQ(Data AcQuisition) board is a VME standard module and was originally developed for the SciBar detector in K2K experiment. We use this DAQ board for an analog-to-digital conversion of A_OUT from Trip-t. Several modifications are made to the DAQ board in order to adjust it to the readout of MPPCs. VME SIDE : : J0 FPGA;XC3S400PQ208 ADC;AD9220 Discri signal of each 32ch Analog signal proportional to input signal Analog signal proportional to the time between input signal and gate signal Total 128pins • Since A_OUT of Trip-t has 1.0V DC offset, we put A_OUT to the outm of the DAQ board and DC+1V to the outp. By subtracting the outp from the outm, A_OUT has no offset. • We change the gain of DAQ board from 20 to 1 because the gain of the Trip-t is enough high. Trip-t & MPPC Mount Board DAC;MAX529 TRG-A TRG-B BUSY TA-B TA-A CLK 40pin connector×2 MPPC Hole 5.3φ （32 Mount） Trip-t Position Labview … Distal wave generator Trip-t Performances Input charge versus. ADC count Linearity Cross-talk ±5VIN Bias control Bias control High Gain 155mm When the gain of Trip-t is high, linearity become wrong at low charge region. Check the signal cross-talk to the another input channel. Cross-talk is small enough. 190mm 190mm Those 2 boards, Labview and VME are connected by flat cable. Low Gain 0.4% 65mm MPPC Mount Side Trip-t Mount Side Input only No.15 channel MPPC Mount Board with 32 MPPC Trip-t Test Board for Measurement …with Plastic Connector for connecting MPPC to wave length shifting fiber The left figure is MPPC raw signal. MPPC has good photon counting capability. By using Trip-t Test Board, we are now measuring about the basic performances and device-by-device variation of MPPC for T2K experiment. Pedestal KEK Trip-t BoardBlockdiagram 1PE Trip-t power supplies 2PE VDDD(digital)=+2.5V , VDDA(analog)=+2.5V 3PE OPAMP power supplies･･･±5V When we use all 32 channel, each output come at each MUX positions as those figure. MPPC raw signal Power supply +5V -5V Input to 10CH 3PE Regulator +5V  +2.5V 2PE VME 1PE Trip-t OPAMP Pedestal 10 11 12 13 1･2･3･4･5･6･7･8･9･10･11･･･ Trip-t Block Diagram ch2 Example Histogram by Trip-t Basic performances of MPPC Serialized Pedestal For T2K experiment, ~60000 samples of MPPC must be measured. By this test board, we can measure 32 MPPCs at the same time. Now, we construct the system for mass production of MPPC samples for T2K experiment with this 32ch test board. 1PE 2PE 3PE PD07International for poster Jun 27-29,2007 Kobe