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“End station A setup” data analysis

“End station A setup” data analysis. Josef Uher. Outline. Introduction to setup and analysis Quartz bar start counter MA and MCP PMT in the prototype. What was analyzed. ADC. quartz bar start counter 4 pad MCP - PMT. Leading Edge Discriminator. TDC. prototype 3x MCP PMT (Burle)

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“End station A setup” data analysis

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  1. “End station A setup” data analysis Josef Uher

  2. Outline • Introduction to setup and analysis • Quartz bar start counter • MA and MCP PMT in the prototype

  3. What was analyzed ADC quartz bar start counter 4 pad MCP - PMT Leading Edge Discriminator TDC prototype 3x MCP PMT (Burle) 2x MA PMT (Hamamatsu) Constant Fraction Discriminator TDC light source -pulse laser “Pilas”

  4. Tasks for data analysis software • develop a timing strategies for start counters • develop a calibration procedure for the prototype (determine time offsets for each of all modules, determine single electron timing resolutions) • help to tune the setup and find errors

  5. What can affect timing resolution? • fluctuation of avalanche • recoil of photoelectrons from MCP surface • charge sharing • cross talk • electronics noise • smear of pulse source (laser) • ...

  6. Timing resolution vs. Pilas trigger frequency Average improvement of the timing resolution ~22% (measured with MA PMT Hamamatsu)

  7. Quartz bar start counter

  8. Quartz bar start counter quartz bar start counter 4 pad MCP - PMT ADC Leading Edge Discriminator TDC Configuration with ADC gives possibility to correct measured time on pulse height off-line. => better control than in case of CFD

  9. Before correction After correction Amplitude TDC threshold ADC vs. TDC t1 t2 Time s1=250 ps s1=100 ps TDC spectra ADC correction – how it works?

  10. Quartz bar start counter timing resolution Improvement for single photons from ~350 ps to ~138 ps.

  11. Prototype

  12. Burle MCP-PMT, raw TDC spectra ? ? ? ? ? ?

  13. Hamamatsu MA-PMT, raw TDC spectra ? ? ? ?

  14. MCP and MA PMT timing resolution MA PMT Hamamatsu ±43 MCP PMT Burle ±58 (raw data only, single photon mode, no corrections)

  15. Peak position Peak position Peak position Peak position Pad timing offset maps Without TDC link offset Start TDC 1 TDC 2 TDC 3 TDC 4 Delay ~1ns MA PMT Hamamatsu MCP PMT Burle

  16. Cross talk

  17. Cross talk treatment Possible sources of “false pulses”: • charge sharing • recoiled electrons • internal PMT cross talk (wiring) • cross talk in amplifiers • cross talk in CFD • photons bouncing in prototype box

  18. Cut in certain time after the first pulse Cross talk treatment Cross talk can appear in any pad of MCP or MA PMT Time MCP or MA PMT

  19. Cross talk treatment Example of cross talk treatment with time window 15 counts. Events [-] MCP PMT Burle Time [cnt]

  20. Cross talk treatment Example of cross talk treatment with time window 15 counts. Events [-] MCP PMT Burle Time [cnt]

  21. Cross talk treatment Example of cross talk treatment with time window 27 counts. Events [-] The time window changed from 15 to 27 counts MCP PMT Burle Time [cnt]

  22. Cross talk treatment Time window 27 cnt Cross talk spectra with time window 15 and 27 counts. Events [-] Time window 15 cnt MCP PMT Burle Time [cnt] Cross talk only

  23. Cross talk treatment Corrected TDC spectra with time window 15 and 27 counts. Events [-] Time window 15 cnt Time window 27 cnt MCP PMT Burle Time [cnt]

  24. Cross talk treatment Events [-] narrow s = 190 ps Time [cnt] Raw TDC spectrum Time window 1 Time window 31

  25. Cross talk “frequency” Multiple hits Raw data max.: ~7 Corrected data: ~5 MCP PMT Burle after cross talk correction improvement 14% 13%

  26. Conclusion • Influence of Pilas laser on timing resolution discovered. Higher Pilas trigger frequency needed – another Pilas laser will be tested. • Repeated measurement of quartz bar start counter timing resolution – still needs more work • All slots in the prototype will be tested in near future • Effective cross talk treatment was implemented in data analysis code

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