New Studies on VPTs Setup RIE Photonis XPVPT25 Stefanie Bolte - - PowerPoint PPT Presentation

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New Studies on VPTs Setup RIE Photonis XPVPT25 Stefanie Bolte - - PowerPoint PPT Presentation

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New Studies on VPTs Stefanie Bolte Introduction New Studies on VPTs Setup RIE Photonis XPVPT25 Stefanie Bolte Hamamatsu R2148MOD1 Experimental Hadron Physics, Hamamatsu Ruhr-Universitt Bochum R2148MOD Summary March 3rd, 2009

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SLIDE 1

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

New Studies on VPTs

Stefanie Bolte

Experimental Hadron Physics, Ruhr-Universität Bochum

March 3rd, 2009

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SLIDE 2

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Introduction

Electromagnetic Calorimeter Forward Endcap Special needs for photodetectors because of

  • magnetic field ⇒ no PMTs
  • high rate ⇒ no APDs for innermost crystals

⇒ Photodetectors: sensitive, fast, radiation hard and suitable to operate in magnetic fields presentation of the new VPT type of Hamamatsu (<24 mm) and measurement concerning the sensitivity of the VPTs’ surface

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SLIDE 3

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Setup

  • LED pulser (f = 1 kHz)
  • LUXEON1 High-Power LED

λ = 455 nm

  • optical fibre transfers light

pulses to VPT

  • preamplifier behind VPT

transmits signal to mainamplifier and afterwards to ADC

  • preamplifier developed in

Basel for PANDA

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SLIDE 4

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Technical Data

RIE sample from the CMS experiment

  • ∅ = 26.5 mm

ℓ = 40 mm

  • UA = 1000 V

UD = 800 V

  • G = 10
  • QE = 22 %

(at 430 nm)

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SLIDE 5

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Sensitivity

  • maximum in one corner
  • yield varies between 750

and 1050

  • relative width 7.8 %
  • sensitive area ∅ = 19 mm

hist4

Entries 678 Mean 915.9 RMS 71.13

Mean 750 800 850 900 950 1000 1050 Counts 2 4 6 8 10 12 14 16 18 20 22 hist4

Entries 678 Mean 915.9 RMS 71.13

RIE

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SLIDE 6

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Technical Data

Photonis XPVPT25 latest sample from Photonis, made for PANDA

  • ∅ = 25.2 mm

ℓ = 87.4 mm

  • UA = 1090 V

UD = 763 V

  • G = 30
  • QE = 20 %
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SLIDE 7

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Sensitivity

  • maximum and minimum

side by side

  • yield varies between 500

and 2200

  • relative width 22.1 %
  • sensitive area ∅ = 25 mm

hist1

Entries 603 Mean 1728 RMS 362

Mean 600 800 1000 1200 1400 1600 1800 2000 2200 Counts 2 4 6 8 10 12 14 hist1

Entries 603 Mean 1728 RMS 362

Photonis XPVPT SN31

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SLIDE 8

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Technical Data

Hamamatsu R2148MOD1 sample from Rainer Novotny

  • ∅ = 25.8 mm

ℓ = 30 mm

  • UA = 800 V

UD = 640 V

  • G = 11
  • QE = 19 %

(at 440 nm)

slide-9
SLIDE 9

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Sensitivity

  • minimum in the middle,

maximum at the edge

  • yield varies between 500

and 750

  • relative width 9.2 %
  • sensitive area ∅ = 18 mm

hist3

Entries 603 Mean 648.7 RMS 59.69

Mean 500 550 600 650 700 750 Counts 5 10 15 20 25 30 hist3

Entries 603 Mean 648.7 RMS 59.69

Hamamatsu R2148MOD1

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SLIDE 10

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Technical Data

Hamamatsu R2148MOD especially made for PANDA, ∅ < 24 mm

  • ∅ = 23.7 mm

ℓ = 30 mm

  • UA = 750 V

UD = 500 V

  • G = 9.3
  • QE = 32 %

(at 420 nm)

slide-11
SLIDE 11

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Sensitivity

  • minimum in the middle,

maximum at the edge

  • yield varies between 850

and 1300

  • relative width 7.4 %
  • sensitive area ∅ = 16 mm

hist2

Entries 493 Mean 1110 RMS 82.26

Mean 850 900 950 1000105011001150120012501300 Counts 2 4 6 8 10 12 14 hist2

Entries 493 Mean 1110 RMS 82.26

Hamamatsu R2148MOD

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SLIDE 12

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Summary

RIE Photonis R2148MOD1 R2148MOD HV 1000 V 1090 V 800 V 750 V G 10 30 11 9.3 QE 22 % 20 % 19 % 32 % ∅ 26.5 mm 25.2 mm 25.8 mm 23.7 mm ∅sen.area 19 mm 25 mm 18 mm 16 mm

  • rel. width

7.8 % 22.1 % 9.2 % 7.4 % G · QE 2.20 6.00 2.09 2.98 AMP 916 1728 649 1110

AMP G·QE

1.1 0.8 0.8 1

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SLIDE 13

New Studies

  • n VPTs

Stefanie Bolte Introduction Setup RIE Photonis XPVPT25 Hamamatsu R2148MOD1 Hamamatsu R2148MOD Summary Outlook

Outlook

Vacuum Photo Tetrode (VPTT), made by RIE VPTT G ≥ 20 QE 25% G · QE > 3.0 ∅ 22.5 ± 0.7 mm l ≤ 46 mm ∅sen.area ≥ 16 mm What more has to be done?

  • rate studies
  • influence of a magnetic field
  • temperature dependency