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R&D of MPPC in kyoto

R&D of MPPC in kyoto. M.taguchi. picture. I will show you real one later!. MPPC(Multi pixel photon coutner). MPPC characters:. 100~1000 APD pixel in 1mm 2 Each pixel operates as Geiger mode (independent of input light) The output is a sum of all the APD signals. Compact Low-cost

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R&D of MPPC in kyoto

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  1. R&D of MPPC in kyoto M.taguchi

  2. picture I will show you real one later!

  3. MPPC(Multi pixel photon coutner) MPPC characters: • 100~1000 APD pixel in 1mm2 • Each pixel operates as Geiger mode (independent of input light) • The output is a sum of all the APD signals • Compact • Low-cost • Insensitive to the magnetic field • Low bias voltage :30~75V • High gain:105~107

  4. Raw signal and ADC hist of MPPC 2 1 0 Great performance for photon counting

  5. History of R&D • 2005.Apr~ measurement of fundamental performance feedback to HPK • 2005.Nov beamtest@KEK • 2005.Dec laser test of the sample we used at beamtest • 2006.Jan we got the new samples • 2006.Feb feedback to HPK • 2006.Mar~ laser test of the new samples • 2006.May feeback to HPK Now at this stage

  6. Summary of the parameter of the new sample @noise rate=800kHz,T=20℃

  7. Uniformity in 1pixel efficiency RMS/mean=2% HPK53(100pixel) bias=68.8V 1pixel gain laser 100μm RMS/mean=2%

  8. efficiency Uniformity of each pixel HPK53(100pixel) Bias=68.8V RMS/mean=3% gain Total 100pixel RMS/mean=3%

  9. Summary and future plan • The new samples satisfy T2K requirement We can use MPPC in T2K (particularly in On-Axis) • Study Individualtiy of large number of samples • Readout electronics • Packaging • Beamtest of S type scintillator with MPPC

  10. Back up

  11. # event 0p.e 1p.e 電荷量 Blue LED Measurement of gain Charge sensitive ADC amp X10～100 MPPC Caluculate charge of 1p.e MPPC gain Q = Q e・(amp gain) 素電荷

  12. Measurement of gain 311-53-1A-002-1 311-32-1A-002-5 3×106 1×106 15℃ 15℃ 20℃ 20℃ 1×106 25℃ 25℃ 68.4 69.6 68.4 69.4 Bias V Bias V

  13. Crosstalk measurement Crosstalk‥ photons emitted from one pixel during the Geiger discharge causes the Geiger discharge at neighboring pixels ・Assuming 2p.e noise is caused by crosstalk of 1p.e noise(accidental coincidence of 1p.e noise is negligible) Data taken by random trigger Crosstalk rate = 1.5p.e 0.5p.e

  14. Measurement of crosstalk 311-53-1A-002-1 311-32-1A-002-5 15℃ 15℃ 15℃ 0.3 0.3 20℃ 20℃ 20℃ 25℃ 25℃ 25℃ 68.4 69.6 68.4 69.4 Bias V Bias V

  15. Beamtest @KEK in Nov.2005 setup • 0.5～1.4GeV/c • proton & pion • ～100 event/spill • beam size 1x1cm2 Motivation ・Can the light yield for T2K near detector be obtained? beam 64ch MAPMT (as reference) (more than 5p.e for MIP) HPK100e or Russian SiPM 4 layers Scintillator 1.3x2.5x50 cm3 (used in K2K scibar detector) 1mmΦ fiber

  16. Beamtest@KEK(cont’d) ・The measured PDE including optical contact for HPK100 and Russian SiPM are about 0.7 and 1.0 of PMT, so obtained light yield is consistent with the expectation considering the misalignment of a fiber

  17. efficiency Uniformity in 1pixel RMS/mean=1.7% HPK32(400pixel) bias=68.8V gain crosstalk 0.25 RMS/mean=1.6%

  18. efficiency Uniformity of each pixel HPK32(400pixel) Bias =68.8V RMS/mean=3.4% crosstalk gain 0.18 RMS/mean=2.9% RMS/mean=16%

  19. KL→π0νν

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