?????????????????? ????MPPC?????

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?????????????????? ????MPPC?????

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• ????

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ILC??

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????????(???????????)
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?????????????
?????????(???????) MPPC?????????????!!
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???MPPC???

• ????????????????????
• ????????
• ?????????10 Mchannel
• ???(3T)????

Electro-magnetic Calorimeter
tungsten plate
1 cm x 4.5cm x 3 mm
particles
????????????? ???????MPPC!!
readout by MPPC
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MPPC (Multi Pixel Photon Counter)

• ?????????????????? ??????????

??
?????
???????
??????

• Cost performance???
• Gain???(105)
• ??????????
• ???????????
• ?????????
• ??????

PMT
MPPC
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MPPC?????
Al -conductor
Si Resistor
Guard ring n-
n
p
SiO2
??
?????????
p-
Substrate
Substare p
1pixel?????
????
MPPC
APD(Avalanche Photo Diode )?1pixel???????
LED
?????6080V
MPPC????
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MPPC Pulse Shape
1 p.e. (photo-electron) 2 p.e. (photo-electron)
1 p.e peak
2 p.e peak
1 p.e.???????
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????ILC????????????????????!!
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Back Up
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Linearity graph
Nfire (Mean - Pedestal)/d d (SPP
Pedestal)/AMP
1600pixel?????????????????????????????????
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??????(??????)

• ??????????? ??????
• Gain???? 106

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Gain?????
Gain????
Gain????
C Pixel Capacitance V0 Breakdown voltage
A Amp gain 63 e electron charge
1.6 x 10-19 C S AD????????????? (0.25pc/count)
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Set Up (P.D.E.)
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Gain
(Previous Version sample results)
V0aTb
a (5.67 0.03) x10-2 V/oC b 66.2 0.1 V
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Noise rate
(Previous Version sample results)

• 30oC
• 25oC
• 20oC
• 15oC
• 10oC
• 0oC
• -20oC

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Cross-talk Probability
(Previous Version Sample results)
2 pixel fired?Signal? crosstalk???
Vbias V0 lt 2.5V?????Cross-talk? ????????
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???? PMT(HPK? H1161GS)?MPPC????????????
?????.P.D.E??????????
Set
Up PMT,MPPC????????????????????