1

Development of Multi-pixel Geiger mode APD (SiPDevelopment of Multi-pixel Geiger mode APD (SiPM) for a variety of new applications.M) for a variety of new applications.

• Multi-pixel Geiger mode APD (so called SiPM)• A possible new photo-sensor replacing PMT.

PMT SiPM

Gain ~106 ~106

Bias Voltage ~1000V ~50 V

Size small Compact (tiny)

Magnetic field Very sensitive No influence

Stability Good Unknown

Noize rate quiet ~MHz(lower?)

Response fast fast

Structure Simple (cheap)

When the technology of SiPM is established, the usage of SiPM may be as easy as that of photo-diode with photon-counting capability.

2

Development of the photon-counting Development of the photon-counting SYSTEMSYSTEM with SiPMwith SiPM

Discriminator

ADC/TDC

AmplifierSiPM

Voltage Controller

Temperature monitor

Step 1 Step 2

…

ASIC

…. Step N (future, not scope in this research)

1cm

• Multi-channel SiPM as an image sensor with Mage-pixel? {This picture is the multi-channel (32ch) APD }

• ASIC will be directly embedded on the sensor.(Example: A silicon pixel detector for LHC)

O(100)~O(10,000) channels

3

Vendor & ManufactureVendor & Manufacture

KEK

Hamamatsu?

RussianCompany 1

RussianCompany 2

UniversityEducation

Other Applications(PET?, Imaging sensor, ..)

Exp. Group(, ILC, Belle, …)

UniversityDetector R&D

usersusers

KEK should play a central role for the SiPM development fKEK should play a central role for the SiPM development for a variety of feature applications.or a variety of feature applications.

Development of SiPM itself

Development of readout technology for applications

4

Applications• T2K Near detector

– Full active scintillator tracker like K2K-SciBar

• ILC calorimeter• Belle/Super-Belle [KLM, Calorimeter??]• High resolution 3D photo-sensor for general applications

including PET.

SiPM arrayScintillator array

SiPM arrayScintillator plateWLS fiber