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PMT Calibration Results and the MC simulation

PMT Calibration Results and the MC simulation. Shigeru Yoshida, Chiba University http://www.ppl.phys.chiba-u.jp/. Outline. Overview of the IceCube PMT calibration for the detector MC Absolute QE/CE Uniformity of CE Charge Resolution/WaveForm The Response Modeling

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PMT Calibration Results and the MC simulation

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  1. PMT Calibration Results and the MC simulation Shigeru Yoshida, Chiba University http://www.ppl.phys.chiba-u.jp/

  2. Outline • Overview of the IceCube PMT calibration for the detector MC Absolute QE/CE Uniformity of CE Charge Resolution/WaveForm • The Response Modeling • A DOM-analog MC prototype

  3. The DOM/PMT calibration Gain/Waveform (by S.Yoshida Mons2003) DOM 2D Scan (Scheduled this year) QE/CE + Uniformity (by H.Miyamoto Mons2003/this meeting)

  4. The Absolute QE/CE measurement Monitoring N2 Scattering by The calibrated tubes Aperture Limiter Reflectors/Attenuators Energy Meter

  5. Attachment for the IceCube PMT Calibration PMTs Chamber PMT Box Beam Rotation Bed N2 laser • Photon beam with 13 mm diameter scans the cathode

  6. CE Uniformity2D scan PMT UV LED R-guide Rotation-bed Motor

  7. The Collection Efficiency: Lego plot

  8. Example: The relative Collection Efficiency SF0030 vs SF0050 SF0016 vs SF0050

  9. Charge Resolution/Waveform In the Freezer Temp –32degree

  10. PMT Setting in the Freezer Base circuit Diffuser attached to UV LED

  11. SPE Charge Spectrum

  12. SPE Waveform

  13. The calibration data for the MC simulation • The absolute QE/CE data of 4 PMTs now under measurement • The CE uniformity data of 16 PMTs available • The SPE spectrum and the waveform @ -30C At HV from 1600V to 2000 V for 4 PMTs • The Gain uniformity data of 1 PMT (possible to add 3 more PMTs) We are ready to add more PMT data this summer in the pre-shipping measurement.

  14. The Table data + Interpolation DOM 2D scan + Normalization By the absolute calibration GEANT4 QE/CE + Uniformity Empirical Table The DOM response Modeling Charge Response/Waveform

  15. SPE Charge Response • Sspe(q)~ (1-Pe)exp[-q/qt] + Pe NG(q-q0/qs)

  16. SPE Charge Response Cont’dSome GOOD News • qt/q0, qs/q0 universally scaling

  17. SPE Charge Response Cont’dSome GOOD News • Global qt/q0, qs/q0can reconstruct the response of ALL PMTs at every gain

  18. And some BAD News… • GAIN seems to have some position dependences….

  19. We see it in the “CE” scan data CE XGain . • We may be able to ignore this because… • so smallin terms of AREA • Simulating MPEs response would be OK • ONLY SPEsimulation might be problematic

  20. SPE Waveform Model • Gaussian fits well!!

  21. SPE Waveform Model • FWHM of a SPE pulse depends on PMT gain. • But the change is small … 200 psec or so

  22. Some Issues and Proposal • Uniformity exhibits significant tube to tube variance. We do not want to implement 4800 tables in the DOM MC. • SIMULATE the response for the broader light beam as a function of angle and compare it with the measurement at UW.

  23. Some Issues and Proposal (Cont’d) • Localized gain variance has been found. • Use the AVERAGE behavior ?

  24. Some Issues and Proposal (Cont’d) • Localized gain variance has been found. • Just ignore it!

  25. DOM Analog MC prototype DOMVPmtWaveform.cc (1-Pe)exp[-q/qt] + Pe NG(q-q0/qs) DOMVPmtCharge.cc GEANT4 DOMVPmtQe.cc DOMVGlass.cc DOMVGel.cc

  26. Summary • The PMT calibration data is ready for the detector MC • Modeling the PMT response was done. • A 1st prototype PMT MC module is being built under the root framework • Running this MC would address some concerns like the tube-tube variance • Please bookmark http://www.phys.chiba-u.jp/research/IceCube/PMT/

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