1. 1 Development of Multi-pixel Geiger mode APD (SiPM) for a variety of new applications. Multi-pixel Geiger mode APD (so called SiPM) A possible new photo-sensor replacing PMT. PMTSiPM Gain~10 6 Bias Voltage~1000V~50 V Size smallCompact (tiny) Magnetic fieldVery sensitiveNo influence StabilityGoodUnknown Noize ratequiet ~MHz(  lower?) Responsefast 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. 2 Development of the photon-counting SYSTEM with SiPM Discriminator ADC/TDC Amplifier SiPM 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. 3 Vendor & Manufacture KEK Hamamatsu? Russian Company 1 Russian Company 2 University Education Other Applications (PET?, Imaging sensor,..) Exp. Group (, ILC, Belle, …) University Detector R&D users KEK should play a central role for the SiPM development for a variety of feature applications. Development of SiPM itself Development of readout technology for applications

4. 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 array Scintillator array SiPM array Scintillator plate WLS fiber