Development of a powereffective muon telescope for 3

Development of a power-effective muon telescope for 3 D CAT scan of a volcano Hiroyuki Tanaka Third International Forum on High Energy Geophysics

Photography X-ray m Muography Neutrinography muon neutrino km Mm scale

70 muons / sec・m 2 ・sr in vertical

muon

Cosmic-ray muon telescope module system

3. 5 kg

CW-R 7724 Conventional Hamamatsu R 7724 1. 5 W DC 5 V in 175 m. W /ch

Total Weight 420 g Ethernet cable Network chip 0. 2～１ W FPGA chip ~0. 3 W Event rate=100 k x 48 ~5 MHz FPGA- SPARTAN 3 AN User Flush 11 MB 200 MHz comparator ～１ W Vth Trimmer probe

System Specification Weight • Telescope module 3. 5 kg/ch • Electronics module 420 g Power • Telescope module 175 m. W/ch +2 W(converter) • Electronics module 2. 5 W/48 ch+2. 5 W(converter)

New telescope N Tsumagoi Vil. Asama yama Maekake yama Mu-CAT system Point N Point E Conventional telescope 500 m

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Monitoring @ERI

Forward Backward

Mu event Backward West East Forward

Muographs

Volume Representation

Conclusion • Conventional unidirectional muography: “the technique only resolves the average density distribution along individual muon paths”, is solved.