Contalbrigo M.

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1 Contalbrigo M. Photon Detectors: MA-PMT ✓ Mature and reliable technology ✓ Large Area (5x5 cm 2 ) ✓ High packing density (89 %) ✓ 64 6x6 mm 2 pixels cost effective device ✓ High sensitivity on visible towards UV lig ✓ Fast response only option to keep the schedule is the use multi-anode photomultipliers (we consider the mising SiPM technology as the alternative) 28 H8500: 14 with standard window (H8500C) 14 with UV window (H8500C-03) 2 H12700: za003 and za0014 Torus fringe fields in the RICH photo-detector area

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Photon Detectors: MA-PMT. The only option to keep the schedule is the use o f multi-anode photomultipliers (we consider the promising SiPM technology as the alternative). ✓ Mature and reliable technology ✓ Large Area (5x5 cm 2 ) ✓ High packing density (89 %) - PowerPoint PPT Presentation

Transcript of Contalbrigo M.

Page 1: Contalbrigo M.

1Contalbrigo M.

Photon Detectors: MA-PMT✓ Mature and reliable technology✓ Large Area (5x5 cm2) ✓ High packing density (89 %) ✓ 64 6x6 mm2 pixels cost effective device ✓ High sensitivity on visible towards UV light✓ Fast response

The only option to keep the schedule is the use of multi-anode photomultipliers (we consider the promising SiPM technology as the alternative)

28 H8500: 14 with standard window (H8500C) 14 with UV window (H8500C-03) 2 H12700: za003 and za0014

Torus fringe fields in theRICH photo-detector area

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MA-PMT Gain Map

Up to 1:4 pixel gain variation can becompensated by the read-out electronics

H8500

Gain

SPE Loss

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MA-PMT Gain Map

Up to 1:4 pixel gain variation can becompensated by the read-out electronics

H8500

H12700 1:2 gain variation

Gain

SPE Loss

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H8500 Pixel SPE Loss

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MA-PMT SPE Loss

SPE loss limited to ~15% above 1040V and almost uniform over 28 MA-PMTs

Gain

SPE Loss

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H8500 Pixel SPE Loss

5Contalbrigo M.

MA-PMT SPE Loss

SPE loss limited to ~15% above 1040V and almost uniform over 28 MA-PMTs

Gain

SPE Loss

H12700 features a significant better SPE resolution than H8500 at similar gain

HV = 1040 V

MA-PMT GainMA-PMT Gain

Gai

n x

106

HV = 1000 V

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MA-PMT SPE Resolution

6Contalbrigo M.

Jlab Test Stand H8500

Single Photoelectron Spectrum

H12700

FADC counts

Q1

s1

Pixel Number

Reproduce Hamamatsu gain map

Pixel #57: typical higher dark current

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MA-PMT SPE Resolution

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MA-PMT SPE Resolution

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Gain

Resolution

Efficiency ??

SPE Resolution

SPE Resolution

Gai

nG

ain

H8550 @ 1000 V

H12700 @ 1000 V


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