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Phototube response for a multi-element Optical Module

Published byDominic Wiggins Modified over 6 years ago

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Presentation on theme: "Phototube response for a multi-element Optical Module"— Presentation transcript:

1 Phototube response for a multi-element Optical Module
A. Mjös H. Löhner P. Lubberdink N. Kalantar KVI Groningen in collaboration with NIKHEF Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

2 H. Löhner - PM studies for multi-PM OM
Motivation Antares: 10” PM multi-PM configuration: 3” PM larger field of view, low noise, trigger selectivity Candidate: Photonis XP53x2 (or modification) produced in large quantities, available for selection Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

3 H. Löhner - PM studies for multi-PM OM
Outline 3” XP53X2 • PMT: Photonis Test Setup Light pulser Analysis • Measurements • Results Future investigations 3” XP3330 Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

4 H. Löhner - PM studies for multi-PM OM
Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

5 H. Löhner - PM studies for multi-PM OM
Test Setup Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

6 H. Löhner - PM studies for multi-PM OM
LED Light pulser light intensity variable by LED supply voltage, neutral-density filters previous pulser present pulser Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

7 charge vs. supply voltage
XP53X2 typ. spread in gain requires selection and sufficient dynamic range Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

8 H. Löhner - PM studies for multi-PM OM
surface sensitivity XP53X2 at max. gain: 4 x 106 (1500 V) t  1 ns photocathode area Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

9 H. Löhner - PM studies for multi-PM OM
Time over threshold sufficient sensitivity Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

10 H. Löhner - PM studies for multi-PM OM
Charge spectrum XP53X2 at max. gain: 4 x 106 (1500 V) s.p.e. dark rate typ. 5 kHz peak/valley 2.4 charge threshold: 0.25 s.p.e. Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

11 electronic noise / base design
= 0.11 mV  = 0.05 mV less critical threshold setting Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

12 H. Löhner - PM studies for multi-PM OM
10 stage tube: XP3330 XP3330 at gain: 4 x 106 (1100 V) peak/valley 2.1 Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

13 Temperature dependence of dark rate
XP3330 at gain: 8 x 106 (1200 V) Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

14 H. Löhner - PM studies for multi-PM OM
Comparison should be improved Peak/valley Dark Noise (Hz) 150 ideal solution: XP53X2 with 10 stages; can be realized within 10 weeks (Photonis offer) Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

15 H. Löhner - PM studies for multi-PM OM
Summary Test setup for systematic measurements 3” PM XP53X2 sensitive to s.p.e. at maximum gain Peak/valley = 2.4 Position and angle-of-incidence dependence over cathode area within 10 % Time spread over cathode area within 1 ns Time-over-threshold analysis yields 4ns/pC  4ns / s.p.e. Improvement on dark noise: a) voltage-multiplying base for XP53X2 (9 stage) (in progress at NIKHEF, prototype available) b) use 10-stage PM: good results with XP3330 (150 Hz) Ideal and viable solution: XP53X2*(10 stage) Pylos, April 2007 H. Löhner - PM studies for multi-PM OM

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