MPPC readout electoronics M.Taguchi(kyoto)

MPPC readout with DAQ board -5V OPAMP - + DAQ board 4m flat cable Trip-t OUT_P OUT_N gain=1 +5V MPPC control signal LED trig Labview

trig DAQ board Labview timingを合わせる MUX_CLK MUX_CLK Trip-t

MUX_CLK from DAQ board MUX_CLK from Labview A_OUT from Trip-t (test charge)

Trip-t OPAMP DAQ cable

ADC distribution(test charge) ADC count

Trip-t A_OUT gain pipeline 3pF 1pF preamp charge preamp gain x1 or x4 pipeline gain x2,x4,x8…

A_OUT of MPPC preamp gain=x4 pipeline gain=x1

ADC distribution 400pixel V=70.0V not same preamp gain=x4 pipeline gain=x1 not same

A_OUT Linearity MPPC 10p.e. (G=7.5x105) preamp gain=x4, pipeline gain=x2 low signal linearity problem associates with this version of chip preamp gain=x4, pipeline gain=x1 preamp gain=x1, pipeline gain=x4

A_OUT of MPPC preamp gain=x1, pipeline gain=x4

ADC distribution(2) 400pixel V=70.0V same preamp gain=x1 pipeline gain=x4 same

MPPC gain measured by Trip-t and CAMAC by CAMAC 100pixel 400pixel 1x106 3x106 4x105 1x106

crosstalk of A_OUT ch preamp gain=x1, pipeline gain=x4 1.4pC to ch15 (Dynamic range of Trip-t with this gain setting) crosstalk~0.4% 0.4% ch

70.0V 100pix 400pix readout 4MPPCs simultaneously 400pix 400pix

Problem? Problem? LED trig V=69.8V V=71.4V V=71.4V LED trig PRE_RST MPPC signal after preamp signal Strange pedestal structure due to charge up on coupling capacitor when bias V up charge on capacitor Trip-t

Problem? no problem V=69.8V V=71.4V at the bias V we see strange pedestal, raw signal is also strange no problem

backup

There is no special change if we change the values of registers - preamp feedback control - preamp drive current - etc… now design the board of 32ch MPPC inputs

A_OUT gain ch Gain (ADC count/pC) 15 730 16 710 31 735 32 732 preamp gain = x1 pipeline gain= x4 variation ~4%

T_OUT charge Disc_OUT voltage PIPE_CLK time difference

T_OUT linearity input charge=0.65pC time(ns) time(ns)

T_OUT gain ch Gain (count/ns) 15 8.52 16 8.60 31 8.00 32 9.97 variation~25%

Disc. threshold curve propability of discri firing input charge =0.13pC 5Vth unit = 2.5fC ~ 0.02p.e. threshold uncertainty

Time walk T_OUT ADC count vs injected charge time walk

position dependence of PIPE_CLK preamp out PIPE_CLK time(ns)