Kuno-Group B4 Yuuki Matsumoto

A report for Graduation research

Development of Trigger Board for MPPC

(for MuSIC experiment)

Contents1.Back Ground & Purpose2.Equipment3.Experiment4.To do (Plan)

1.Back ground &Purpose

Strong magnetic field

Use MPPC for measurement of Muon(8×108/sec) using scintillation counter.

Complex circuit is needed to readout MPPC signal.

SPIROC-A board can perform all part .

here

I develop SPIROC-A board for MPPC

2.Equipment

signalfrom MPPC

HV add and changelogic circuit from PC

send command from PC

EASIROC

Analog out hold

NIM out

SPIROC-A board

FPGAI use right board

The board,@MPPC 32ch can drive at the same time.@It has ADC.@We can program FPGAto use TDC.

@It has not have TDC yet.@Clock output < 334MHz@Clock jitter ±100〜 ±150ps@The board is a new test board , so we don’t know clearly how to use.

Slow Shaper

Slow Shaper

Fast Shaper

Low Gain Pre Amp

High Gain Pre Amp

Discri OR32

Hold Read

Hold Read

ADC1

ADC2

V_th

1.5pF

15pF

Read

EASIROC

25—175ns

25—175ns

15ns

3.Experiment1. I measured ADC spectra from Function Generator.2. I measured ADC spectra from MPPC.

@measured ADC spectra from Function Generatorpink : direct signal from Function Generator(80mV 25ns)blue : high gain after slow shapercyan : low gain after slow shaper

no hold hold

ADC spectra ( Function Generator gave 80mV 25ns pulse )

High gain

Low gain

phed = 975 ch

ADC peak ch and input charge

mV 50 50 50 50 50 60 70 80 90 100 110 120

ns 5 10 15 20 25 25 25 25 25 25 25 25

pC 5 10 15 20 25 30 35 40 45 50 55 60

peak 1337 1715 2098 2473 2821 3187 3458 3569 3607 3622 3630 3636

RMS 18.65 18.5 18.35 18.27 17.74 16.21 8.282 4.124 3.685 3.153 2.782 2.446

[pC]=[mV]×[ns]÷[50Ω]

0 10 20 30 40 50 60 700

500

1000

1500

2000

2500

3000

3500

4000

f(x) = 73.96 x + 977.533333333334

pC

peak

CH

Linear

shaper is down

Δch=73.96 ΔpC

@measured ADC spectra from MPPC

Dark current

Hold is OR32. In oscilloscope , there are many hold from other ch.It may make noises.

1 photon??

2 photon??

What??

Now , examining

4. To do

1 measure MPPC spectra using LED 2 measure resolution and delay of discriminator3 measure TDC spectra (extra TDC)4 write TDC program to FPGA in VHDL 5 measure TDC spectra (internal TDC)

counter(FPGA)

Discri

clock

STOP

Signal from outside

START

PC

< Internal TDC (plan) >

time resolution <1000/334 = 2.99nsmuon life time is 2μs

END