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Mikhail asiatici 03 /07/2014

Development of a SiPM readout circuit and a trigger system for microfluidic scintillation detectors. Mikhail asiatici 03 /07/2014. Overview. Project context (short overview) So far LabVIEW interface for oscilloscope and XY table PMT measurements Amplifiers simulation and PCB design

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Mikhail asiatici 03 /07/2014

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  1. Development of a SiPM readout circuit and a trigger system for microfluidic scintillation detectors Mikhail asiatici 03/07/2014

  2. Overview • Project context (short overview) • So far • LabVIEW interface for oscilloscope and XY table • PMT measurements • Amplifiers simulation and PCB design • PCB manufacturing • In progress • PCB test • Next steps • SiPM measurements

  3. Project context - Target system • Microfluidicscintillator detector • Multiple photodetectors to allowreconstructionof particletracks with high resolution (60 μm channelpitch) • Verylow light level (1.65 photoelectrons per MIP, in average) A. Mapelli et al. - Scintillation particledetectionbased on microfluidics 1/13

  4. project context – sipm vs pmt PMT SiPM A. Mapelli et al. - Scintillation particledetectionbased on microfluidics N. Otte - Silicon Photomultipliers a new device for frontier detectors in HEP, astroparticle physics, nuclear medical and industrial applications 2/13

  5. Project context – Trigger system Sensor photosensitive area Photodetectors Scintillatingfibers 3/13

  6. Project context – xy table Stepper motorscontroller 2 x motorizedlinear stages in XY configuration 4/13

  7. System overview XY table SiPM A SiPM B PicoScope 6403C PC C LabVIEW Under test USB D PMT ext Trigger(s)/signal(s) 5/13

  8. Labview interface: overview 6/13

  9. Labview interface: features (1) • Eachchannelcanbeindependently • Set as signal source, trigger, temperature or disabled • Connected to any pulse source (PMT, SiPM, …) • Trigger modes • Self trigger (on any signal channel) • Single external trigger • A functiongeneratorcanemulate a periodic/random trigger • Coincidence trigger with programmable coincidencewindow • Online pulse integralcalculation and histogramgeneration • Several post-processing options available 7/13

  10. Labview interface: features (2) • Waveformscircularbuffer • Online monitoring of the capture • Temperature acquisition • Temperaturesensorwith voltage output • XY table interfacement • Automatic scan of an array of points • Simplifieddefinition of matrices of points • Import/export from/to XML file • Manual control of the XY table 8/13

  11. Labview interface: features (3) • File logging • Events in ROOT format • Settings and scan points in XML format • Automaticallycreatedtogetherwith the ROOT file • Can beread back in LabVIEW to loadscan points and/or capture settings • Performances • Successful capture of up to 37 000 000 events • Event rate up to 6 kHz 9/13

  12. Labview interface: pmt acquisitions • Tests performedso far: • Scintillatingtile and coincidence trigger (no NIM modulerequired) • Thickliquidscintillator (Davy) • Higherevent rates (up to 1 kHz insteadof 10 Hz) • Highernumber of events in single acquisition (up to 37million) • Variable integration time • 50 ns, single pulse • 10 us, multiple pulses (UV LED excitation) 10/13

  13. Pcb: overview Low voltage power supply (4.75 V – 6 V) Optionally -5 V SiPM (SMD package) PicoScope MCX SMD connector LV LV Step-up switchingconverter Amplifiers Coaxcable HV LEMO connector 11/13

  14. PCB: current situation • PCB delivered on July 2 • Power supply: working • 69.8 V to 75.0 V from 5 V source (USB) 12/13

  15. Next steps • PCB testing • Amplifiers (microScint and INFN) • SiPMmeasures • Darkness • Microchannels • … 13/13

  16. Thankyoufor yourattention

  17. backup

  18. Amplifiers simulations • For SiPM: equivalent model by F. Corsi et al.1 • Parametersfrom one of the devicespresented in the paper (SiPM IRST), with Q = e*M ≈ 200 fC (M ≈ 1.25 x 106 for the devicesreceived) • Amplifier 1: transconductance amplifier + voltage amplifier (single stage from C. Piemonte et al.)2withwide-band voltage-feedback op amp (ADA4817) ≈ 10 mV/pe single stage ≈ 100 mV/pe double stage (but slower) Tsettle5% ≈ 50 – 150 ns (trade gain for speed) Verylow noise (EIN = 4.4 nV/sqrt(Hz)) 1 F. Corsi et al. – Modelling a silicon photomultiplier (SiPM) as a signal source for optimum front-end design 2 C. Piemonte et al. – Development of an automatic procedure for the characterization of silicon photomultipliers 11/20

  19. Amplifiers simulations • Amplifier 2: transconductance amplifier + non-inverting amplifier withwide band current-feedback op amp (AD8000) from F. Giordano et al. ≈ 10 mV/pe single stage ≈ 80 mV/pe double stage Tsettle5% ≈ 40 – 60 ns (fast) Higher noise (EIN = 520 nV/sqrt(Hz)) F. Giordano et al. – Tests on FBK SiPM sensor for a CTA-INFN ProgettoPREMIALE demonstrator (presentation) 12/20

  20. Amplifiers performances summary • Gain in the order of 10s mV/pe, time constants in the order of 10s-100s ns • Amplifier 1 lessnoisy • Amplifier 2 faster 13/20

  21. Amplifiers pcb requirements • The PCB ismeant as a test boardfromwhichpossiblyderive a definitive configuration, soitis important to ensure the maximum possible flexibility • For both the configurations, the signal canbeextractedafter single or double stage • For all of the 4 signal sources, the output canbeexctractedbefore/after a decouplingcapacitor • Capacitorperforms on-board AC coupling, but mightresults in signal reflections • Optional dual supply +/- 5 V as an additionalway to produce a signal with no DC component (but maybedecouplingcapacitorisenough) • All the feedback resistors are potentiometers, to allow gain tuning • There isalways a certain degree of gain-bandwidthtradeoff • Avoid saturation for eventswith a highernumber of photoelectrons • Bypassable on-boardlinear voltage regulator • Compare noise with on-board/external voltage regulation 14/20

  22. SMD SiPM adapter board (dimensions in mm) Connector Holes for mechanical support SiPM (Hamamatsu S12571-050P) 15/20

  23. Amplifiers board Jumpers for on-board/external voltage regulationchoice SiPMconnectors: LEMO Output connectors: LEMO Jumpers for single/dual voltage supplychoice Power supply (HV, LV, optional -5 V, GND) 16/20

  24. Power supply board • Step-up switching voltage regulator, to avoid the need of an high-voltage supplyjust for SiPMbiasing • Output voltage tuning • Integrated DAC with serial interface • Digital pins available for a possible future integrationwithe.g. a microcontroller • Potentiometer (here not shown) • Input voltage range: 4.75 V – 6 V • Output voltage range: 64 V – 69 V @ 2 mA • Vop of the availableSiPM: 66.6 V ± 1.3 V • Recommended Vop range: 2.1 V • Bypassableadditional LC filter at the output to reduceripple (not shown) • Same architecture used for SiPMbiasing in the Schwarzschild-Couder CTA Telescope K. Meagher (Georgia Tech) – SiPM Electronics for the Schwarzschild-Couder Telescope (presentation) 17/20

  25. Power supply board LV in (4.75 V – 6 V) Digital interface pins Jumpers to choose DAC/potentiometer for output voltage regulation HV out (64 V – 69 V) 18/20

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