Status of the muon veto GERDA Collaboration Meeting LNGS November, - - PowerPoint PPT Presentation

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Status of the muon veto GERDA Collaboration Meeting LNGS November, - - PowerPoint PPT Presentation

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Status of the muon veto GERDA Collaboration Meeting LNGS November, 5 th -7 th 2007 Markus Knapp Overview: muon veto plastic scintillator photomultiplier Cherenkov-Veto Pillbox VM 2000 GERDA Meeting, LNGS, November, 5 th -7 th 2007

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SLIDE 1

Status of the muon veto

GERDA Collaboration Meeting

LNGS November, 5th-7th 2007 Markus Knapp

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SLIDE 2

plastic scintillator Cherenkov-Veto photomultiplier „Pillbox“

Overview: muon veto

VM 2000

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 3

Status of encapsulation

PET-window delivered encapuslation delivered further treatment B20 socket and voltage divider delievered cable / cable feedthrough delivered mineral oil / μ-metal delivered silicon gel delivered small steel parts delivered polyurethane delievered PMT 9350KB (ETL) delivered

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 4

Status of encapsulation

PET-window delivered encapuslation delivered further treatment B20 socket and voltage divider delievered cable / cable feedthrough delivered mineral oil / μ-metal delivered silicon gel delivered small steel parts delivered polyurethane delievered PMT 9350KB (ETL) delivered

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

D E L I E V E R E D

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SLIDE 5

Status of encapsulation

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 6

PMT Assembly Line 5 Steps

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

  • 1. Masterbond glueing
  • 2. Cable soldering
  • 3. Pouring of polyurethane
  • 4. Pouring of silicon gel
  • 5. Oil filling
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SLIDE 7

PMT Assembly Line 5 Steps

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

P

  • l

y u r e t h a n e c a b l e s

  • l

d e r i n g Silicon Masterbond

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SLIDE 8

PMT Assembly Line 5 Steps

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

O i l f i l l i n g Silicon Polyurethane cable soldering

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SLIDE 9

PMT Assembly Line

  • 1. Masterbond glueing

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 10

PMT Assembly Line

  • 2. Cable soldering

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 11

PMT Assembly Line

  • 3. Pouring of polyurethane

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 12

PMT Assembly Line

  • 4. Pouring of silicon gel

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 13

PMT Assembly Line

  • 5. Oil filling

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 14

PMT Assembly Line Finished

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 15

PMT Assembly Line Finished

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 16

Status of encapsulation

  • prototypes under

water

  • two prototypes

running since 7 months

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 17

Status of encapsulation

  • pressure test running

since 3 months

  • two prototypes
  • no problems

encountered

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 18

Cable feedthrough tests

  • vary lengths: x,y,l,h,s
  • worst case scenario

(cut, minimal lengths)

  • running since 7months
  • running since 3 months

under 2bar pressure

  • no problems encountered

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 19

Cable feedthrough tests

Test setup Tests under water

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 20

Status of encapsulation

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 21

VM2000 - Status

  • Not ordered
  • Problem: Adhesive on backside of foil
  • Tests of solubility in water
  • CHNS analysis from EuroEA at

Tübingen:

  • Two samples, one in water, the
  • ther continuously heated in

water

  • no impurities (carbon, nitrogen,

sulphur) in water were detected

  • not enough glue was solved in

water to be detected

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 22

VM2000 – Absorption

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

200 225 250 275 300 325 350 375 400 425 450 475 500 525 550 575 600

  • 0,0025

0,0025 0,005 0,0075 0,01 0,0125 0,015 0,0175 0,02

VM2000 1.3g=74.2 cm2 in 100 ml water

19.01.2007 11 days 18 days 27 days 42 days 104 days 137 days 165 days Wavelength (nm) absorption 10cm cell

  • Measurement from MPIK – Heidelberg -
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SLIDE 23

VM2000 – Attenuation length

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

  • Measurement from MPIK – Heidelberg -

200 225 250 275 300 325 350 375 400 425 450 5 10 15 20 25 30 35 40 45 50

Attenuation length after 162 days

not filtered filtered calculated for GERDA wavelength (nm) attenuation length (m)

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SLIDE 24

VM2000 - Photon spectra

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

  • MaGe Simulation results – Photon Spectra
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SLIDE 25

VM2000

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

If there are no objections, we will order the reflector foil VM2000 as soon as possible.

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SLIDE 26

Time information

wall1 wall2 wall3 wall4 bottom

Bottom PMTs register more photons, but later

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 27

wall1 wall2 wall3 wall4 bottom

Time information

~80 % of photons registered within 40 ns Bottom PMTs register more photons, but later

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 28

Grouping of Photomultipliers

time window # of fired FADCs efficiency 10 ns 4 FADC 96.4% 10 ns 3 FADC 99.0% 30 ns 4 FADC 98.5% 30 ns 3 FADC 99.5% 50 ns 4 FADC 98.9% 50 ns 3 FADC 99.5%

  • different FADC channel combinations will be tested
  • a simple combination is one PM of the pillbox and one
  • f each ring per FADC
  • first results show, high efficiency of more than 98 %

possible

  • other combinations will be tested soon

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 29

Cherenkov veto schedule

Friday: Beginning of mass production Tests at Tübingen November: Tests of DAQ with panels at Heidelberg. February: Production of 80 PMTs finished March-September: Tests at Tübingen End of September: Delivery to LNGS October: Mounting at LNGS

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 30

Reports under preparation

Time structure and randoms of the Cherenkov light (P. Grabmayr, M. Knapp) Photomultiplier encapsulation and mounting (P. Grabmayr, J. Jochum, M. Knapp,

  • L. Niedermeier, F. Ritter, B. Lubsandorzhiev )

VM2000 (P. Grabmayr, J. Jochum, M. Knapp,

  • L. Niedermeier, F. Ritter, +Heidelberg?)

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen

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SLIDE 31

Thank you

GERDA Meeting, LNGS, November, 5th-7th 2007 - Markus Knapp, University of Tübingen