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

2. 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
KM3NeT Meeting, Pylos

3. 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
KM3NeT Meeting, Pylos

4. 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
KM3NeT Meeting, Pylos

5. 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)
Oleg Kalekin University Erlangen
KM3NeT Meeting, Pylos

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

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

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

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

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

11. 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
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
Oleg Kalekin University Erlangen
KM3NeT Meeting, Pylos