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.
The DOM response Modeling DOM 2D scan QE/CE + Uniformity The Table data + Interpolation + Normalization By the absolute calibration Charge Response/Waveform GEANT4 Empirical Table
SPE Charge Response S spe (q)~ (1-P e )exp[-q/q ] + P e N G (q-q 0 /q )
SPE Charge Response Cont ’ d Some GOOD News q /q 0, q /q 0 universally scaling
SPE Charge Response Cont ’ d Some GOOD News Global q /q 0, q /q 0 can reconstruct the response of ALL PMTs at every gain
And some BAD News … GAIN seems to have some position dependences….
SPE Waveform Model FWHM of a SPE pulse depends on PMT gain. But the change is small … 200 psec or so
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.
Some Issues and Proposal (Cont ’ d) Localized gain variance has been found. Use the AVERAGE behavior ?
Some Issues and Proposal (Cont ’ d) Localized gain variance has been found. Just ignore it!
DOM Analog MC prototype DOMVGlass.cc DOMVGel.cc GEANT4 DOMVPmtQe.cc DOMVPmtCharge.cc (1-P e )exp[-q/q ] + P e N G (q-q 0 /q ) DOMVPmtWaveform.cc
Summary The PMT calibration data is ready for the detector MC Modeling the PMT response was done. A 1 st 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/