PMT test setup in Erlangen
description
Transcript of PMT test setup in Erlangen
PMT test setup in Erlangen
Oleg Kalekin
University of Erlangen
Pylos, 16.04.2007
Meeting
Oleg Kalekin University Erlangen
16.04.2007 KM3NeT Meeting, Pylos
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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
Oleg Kalekin University Erlangen
16.04.2007 KM3NeT Meeting, Pylos
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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
Oleg Kalekin University Erlangen
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
Oleg Kalekin University Erlangen
16.04.2007 KM3NeT Meeting, Pylos
5
PMT Test SetupCharge response
Reconstruction of single-/multiple- photoelectron responseModel(*):
• 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•2
n
• PMT charge response: P(i,)•C(i)•exp(-(x-Qi)2/(22i)), i=1,2,…
Qi=i•Q1, 2i= i•2
1, 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
6
PMT Test Setup Charge response
Reconstruction of single-/ multiple- photoelectron response: simulations
Oleg Kalekin University Erlangen
16.04.2007 KM3NeT Meeting, Pylos
7
PMT Test Setup Charge response
Reconstruction of single-/ multiple- photoelectron response
Oleg Kalekin University Erlangen
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
Oleg Kalekin University Erlangen
16.04.2007 KM3NeT Meeting, Pylos
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PMT Test SetupAbsolute 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
10
PMT Test SetupAbsolute 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
11
Photonis PMTs
• 10" PMT ordered, expected to be delivered end of April
• 3" PMT will be provided by NIKHEF
Diam/Areainch/cm2
9/380
5/120
10/600
9/380
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
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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