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 No. of channels 12 No. of Bits 10 Full scale 256 pC Oleg Kalekin University Erlangen 16.04.2007 KM3NeT Meeting, Pylos

PMT Test Setup Charge 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 Oleg Kalekin University Erlangen 16.04.2007 KM3NeT Meeting, Pylos

PMT Test Setup Charge 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 Oleg Kalekin University Erlangen 16.04.2007 KM3NeT Meeting, Pylos

PMT Test Setup Charge 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 Oleg Kalekin University Erlangen 16.04.2007 KM3NeT Meeting, Pylos

PMT Test Setup Charge response Reconstruction of single-/ multiple- photoelectron response: simulations Oleg Kalekin University Erlangen 16.04.2007 KM3NeT Meeting, Pylos

PMT Test Setup Charge response Reconstruction of single-/ multiple- photoelectron response Oleg Kalekin University Erlangen 16.04.2007 KM3NeT Meeting, Pylos

PMT Test Setup Absolute and Spectral Calibration Monochromator LOT-Oriel MS301 fully automated 350-900 nm Tungsten lamp PMT bases for QE measurements Oleg Kalekin University Erlangen 16.04.2007 KM3NeT Meeting, Pylos

PMT Test Setup Absolute and Spectral Calibration Monochromator LOT-Oriel MS301 fully automated 350-900 nm Tungsten lamp PMT bases for QE measurements Oleg Kalekin University Erlangen 16.04.2007 KM3NeT Meeting, Pylos

PMT Test Setup Absolute and Spectral Calibration Monochromator LOT-Oriel MS301 fully automated 350-900 nm Tungsten lamp PMT bases for QE measurements Oleg Kalekin University Erlangen 16.04.2007 KM3NeT Meeting, Pylos

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

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 Oleg Kalekin University Erlangen 16.04.2007 KM3NeT Meeting, Pylos