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Design and Characterization of MPPC Readout Electronics with DAQ System in Labview

This project focuses on developing and analyzing MPPC readout electronics using a DAQ board and Labview software. Key aspects include signal processing, gain adjustment, linearity assessment, and crosstalk reduction. Various parameters like charge distribution, signal timing, and gain settings are carefully studied to optimize performance. Additionally, challenges such as strange pedestal structures and threshold uncertainties are addressed to enhance the system reliability.

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Design and Characterization of MPPC Readout Electronics with DAQ System in Labview

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  1. MPPC readout electoronics M.Taguchi(kyoto)

  2. MPPC readout with DAQ board -5V OPAMP - + DAQ board 4m flat cable Trip-t OUT_P OUT_N gain=1 +5V MPPC control signal LED trig Labview

  3. trig DAQ board Labview timingを合わせる MUX_CLK MUX_CLK Trip-t

  4. MUX_CLK from DAQ board MUX_CLK from Labview A_OUT from Trip-t (test charge)

  5. Trip-t OPAMP DAQ cable

  6. ADC distribution(test charge) ADC count

  7. Trip-t A_OUT gain 3pF 1pF preamp pipeline charge preamp gain x1 or x4 pipeline gain x2,x4,x8…

  8. A_OUT of MPPC preamp gain=x4 pipeline gain=x1

  9. ADC distribution 400pixel V=70.0V preamp gain=x4 pipeline gain=x1 not same

  10. A_OUT Linearity MPPC 10p.e. (G=7.5x105) preamp gain=x4, pipeline gain=x2 • low signal linearity problem associates with this version of chip preamp gain=x4, pipeline gain=x1 preamp gain=x1, pipeline gain=x4

  11. A_OUT of MPPC preamp gain=x1, pipeline gain=x4

  12. ADC distribution(2) 400pixel V=70.0V preamp gain=x1 pipeline gain=x4 same

  13. MPPC gain measured by Trip-t and CAMAC by Trip-t by CAMAC • 100pixel • 400pixel 1x106 3x106 4x105 1x106

  14. crosstalk of A_OUT • preamp gain=x1, • pipeline gain=x4 • 1.4pC to ch15 (Dynamic range of Trip-t with this gain setting) • crosstalk~0.4% 0.4% ch

  15. 70.0V 100pix 400pix readout 4MPPCs simultaneously 400pix 400pix

  16. Problem? Problem? V=69.8V V=71.4V V=71.4V • LED trig LED trig PRE_RST MPPC signal after preamp signal • Strange pedestal structure due to charge up on coupling capacitor when bias V up charge on capacitor Trip-t

  17. Problem? V=69.8V V=71.4V • at the bias V we see strange pedestal, raw signal is also strange no problem

  18. backup

  19. There is no special change if we change the values of registers - preamp feedback control - preamp drive current - etc… • now design the board of 32ch MPPC inputs

  20. preamp gain = x1 pipeline gain= x4 variation ~4% A_OUT gain

  21. T_OUT charge Disc_OUT voltage PIPE_CLK time difference

  22. T_OUT linearity • input charge=0.65pC time(ns) time(ns)

  23. variation~25% T_OUT gain

  24. Disc. threshold curve • propability of discri firing • input charge =0.13pC 5Vth unit = 2.5fC ~ 0.02p.e. threshold uncertainty

  25. T_OUT ADC count vs injected charge time walk Time walk

  26. position dependence of PIPE_CLK preamp out PIPE_CLK time(ns)

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