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MPPC Saturation 13/9/2011

MPPC Saturation 13/9/2011. Shinshu University High energy physics lab Akito Kobayashi. Table. Back ground Feature of MPPC Purpose Method of measurement Set Up Result Summary Task. International Linear Collider (ILC). International Large Detector(ILD).

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MPPC Saturation 13/9/2011

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  1. MPPC Saturation13/9/2011 Shinshu University High energy physics lab Akito Kobayashi kobayashi Shinshu

  2. Table • Back ground • Feature of MPPC • Purpose • Method of measurement • Set Up • Result • Summary • Task kobayashi Shinshu

  3. International Linear Collider (ILC) International Large Detector(ILD) ILC is a new Linear Collider that use erectron and positron. ・The exact measurement of Higgs. ・Discovery new physics such as SUSY. ＜Feature of ILD Cal＞ ・The detection layer is segmented to improve space resolution. ＜Devices requasted＞ ・Small and anable to make many channel. ・Higher Gain. ・tolerant of strong magnetic field. ↓ MPPC（Multi-Pixel Photon Counter） Calorie meter sensor kobayashi Shinshu

  4. Feature of MPPC APD(Avalanche Photo Diode) can amplify electron when bias voltage is over break down voltage(V0) . APD’s output don’t depend on number of entering photons. MPPC curcuit ↓ MPPC’s output is total of all of APD pixel output. APD Pixel kobayashi Shinshu

  5. Response performance of MPPC • APD can detect only one photo electron. →MPPC can’t detect more photon than number of pixel at once. • Number of detected photon and input photon is depend on the following function:(1). kobayashi Shinshu

  6. Purpose • MPPC output is dependent on Number of Pixel. ↓ • Compare response curve to some MPPC’s. （number of pixel = 100 , 400 , 1600 , 2500 , 4400） • Evaluate dynamic range of MPPC. • Relation between time structure and response curve. • Compare measurement and simulation. ↓ Understand the performance of MPPC kobayashi Shinshu

  7. Method of measurement of Response Curve • Light hits MPPC and PMT. • Measure the signal of MPPC and PMT by ADC. • MPPC’s ADC mean convert to Nfired. • Data plot Xaxis : PMT output , Yaxis : Nfired. • This plot is called “Response Curve” MPPC Light source PMT kobayashi Shinshu

  8. Convert ADCCount to Nfired If MPPC’s parameters (C and V0) are known. Without AMP(A=1) The d’ is computed by considering errors of V0. Divide by MPPC ADCCount to d’ to determine Nfired. kobayashi Shinshu

  9. Object of measurement • 5 type of MPPC (sensor : 1mm ×1 mm) 2500 , 1600 pixel package 4400 , 400 , 100 pixel package To measure response curve at same condition, we need to make special measurement system. kobayashi Shinshu

  10. Design of Set Up MPPC 8cm LED WLS Fiber 3cm 1.4cm 14cm 24cm Fiber 0.1cm 9.5cm PMT 27~28cm kobayashi Shinshu

  11. Photo kobayashi Shinshu

  12. Condition of measurement ・Gate Pulse Width = 150ns ・Light Pulse Width = 15ns (half width) ・PMT bias = 600V ・Gain = 1.5×105 LED driver output kobayashi Shinshu

  13. Result of measurement kobayashi Shinshu

  14. 2 MPPC plot kobayashi Shinshu

  15. Summary • Measurement of MPPC’s response curve ↓ • Measurement of response curve of another pakage MPPC is success. • Deference of Nfired in large X between 5 MPPC’s is seen. • MPPC saturation phenomena can’t be seen for all MPPC. kobayashi Shinshu

  16. Task • More narrowly the time width of light pulse. • Simulation of response curve. • Measurement using another light source. • Evaluate reproducibility of measurement system kobayashi Shinshu

  17. Back Up kobayashi Shinshu

  18. MPPC fixed part • MPPC is putted in fixing board • Fixing board is pressed down by two screws • Fixing board kobayashi Shinshu

  19. PMT fixed part • PMTは左右＋後方から金具で固定 • ファイバーはプラスチック版（厚さ1mm）で固定 • ファイバーと光電面の間にグリス等はなし ファイバー kobayashi Shinshu

  20. Fiber&LED fixed part • ファイバーを溝にはめ込む • 光を当てる部分以外はテープで覆う • 露光部分は反射材を被せる 反射材 LED kobayashi Shinshu

  21. Saturation curve following function(1) kobayashi Shinshu

  22. Response curve sample(1600pixel) kobayashi Shinshu

  23. Result of 4400pixel kobayashi Shinshu

  24. Result of 2500pixel kobayashi Shinshu

  25. Result of 1600pixel kobayashi Shinshu

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