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PMT test setup in Erlangen

PMT test setup in Erlangen. Oleg Kalekin University of Erlangen. Meeting. Pylos, 16.04.2007. PMT Test Setup Charge response. Pulser (custom made): Rate  10 kHz FWHM 10ns Variable amplitude Dark Box: Copper shielding Various diameter PMT holders ADC LeCroy 2249A

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PMT test setup in Erlangen

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  1. PMT test setup in Erlangen Oleg Kalekin University of Erlangen Meeting Pylos, 16.04.2007

  2. PMT Test SetupCharge response Pulser (custom made): • Rate 10 kHz • FWHM 10ns • Variable amplitude Dark Box: • Copper shielding • Various diameter PMT holders ADC LeCroy 2249A • No. of channels 12 • No. of Bits 10 • Full scale 256 pC 16.04.2007 KM3NeT Meeting, Pylos

  3. PMT Test SetupCharge response • Pulser (custom made): • Rate 10 kHz • FWHM 10ns • Variable amplitude • Dark Box: • Copper shielding • Various diameter PMT holders • Diaphragms • ADC LeCroy 2249A • No. of channels 12 • No. of Bits 10 • Full scale 256 pC 16.04.2007 KM3NeT Meeting, Pylos

  4. PMT Test SetupCharge response • Pulser (custom made): • Rate 10 kHz • FWHM 10ns • Variable amplitude • Dark Box: • Copper shielding • Various diameter PMT holders • Diaphragms • ADC LeCroy 2249A • No. of channels 12 • No. of Bits 10 • Full scale 256 pC 16.04.2007 KM3NeT Meeting, Pylos

  5. PMT Test SetupCharge response Reconstruction of single-/multiple- photoelectron response Model(*): • 1st dynode: if  mean number of ph.e., probability to detect n ph.e. = P(n, ) - Poisson function • Anode: single ph.e. charge = G(Q1,1) – Gaussian n ph.e. charge = G(Qn,n), Qn=n•Q1 , 2n= n•2n • PMT charge response: P(i,)•C(i)•exp(-(x-Qi)2/(22i)), i=1,2,… Qi=i•Q1, 2i= i•21, C()=1/ 2 • 0 ph.e. (pedestal): P(0, )=exp(- ), if N – total number of event, number of pedestal events N0=N•exp(- ), and then =-ln(N0/N) can be used as first estimation of mean number of ph.e. • Fit method: 2-minimizing with , Q1 , 1 as fit parameters • Software: ROOT Version 5.08/00 (*) E.H. Bellamy, et al., NIM A 339 (1994) 468-476 16.04.2007 KM3NeT Meeting, Pylos

  6. PMT Test Setup Charge response Reconstruction of single-/ multiple- photoelectron response: simulations 16.04.2007 KM3NeT Meeting, Pylos

  7. PMT Test Setup Charge response Reconstruction of single-/ multiple- photoelectron response 16.04.2007 KM3NeT Meeting, Pylos

  8. PMT Test SetupAbsolute and Spectral Calibration • Monochromator LOT-Oriel MS301 fully automated 350-900 nm • Tungsten lamp • PMT bases for QE measurements 16.04.2007 KM3NeT Meeting, Pylos

  9. PMT Test SetupAbsolute and Spectral Calibration • Monochromator LOT-Oriel MS301 fully automated 350-900 nm • Tungsten lamp • PMT bases for QE measurements 16.04.2007 KM3NeT Meeting, Pylos

  10. PMT Test SetupAbsolute and Spectral Calibration • Monochromator • LOT-Oriel MS301 • fully automated • 350-900 nm • Tungsten lamp • PMT bases for QE measurements 16.04.2007 KM3NeT Meeting, Pylos

  11. Photonis PMTs • 10" PMT ordered, expected to be delivered end of April • 3" PMT will be provided by NIKHEF Euro/cm2 3.72 7.48 2.72 3.54 3.26 3.20 Diam/Area inch/cm2 9/380 5/120 10/600 9/380 8/400 12/670 16.04.2007 KM3NeT Meeting, Pylos

  12. Summary • PMT test setup in Erlangen works • Further development is in progress to cover all important PMT characteristics • Tests of Photonis PMTs will start soon • Hamamatsu PMTs will be evaluated to order • Methods, codes, results will be posted on the KM3NeT Portal 16.04.2007 KM3NeT Meeting, Pylos

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