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Piotr Koczo ń,GSI. CBM March 2009. CBM-RICH: Photodetector developement H8500+nXyter+ROC readout. P.Koczo ń, R.Karabowicz, R.Lalik, C.Schmidt, V.Kleipe, W.F.J.Müller. H8500+UV LED + nXyter readout Optical properties of pTer – r é sum é Outlook: WLS foils. Piotr Koczo ń,GSI.

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slide1

Piotr Koczoń,GSI

CBMMarch 2009

CBM-RICH:

Photodetector developement

H8500+nXyter+ROC readout

P.Koczoń, R.Karabowicz, R.Lalik, C.Schmidt, V.Kleipe,W.F.J.Müller

H8500+UV LED + nXyter readout

Optical properties of pTer – résumé

Outlook: WLS foils

slide2

Piotr Koczoń,GSI

CBMMarch 2009

H8500+nXyter+ROC - setup

Schematic view of the

multiparameter measurement

of WLS/H8500 properties

HV

Aperture mask

with pinholes

UV LED

H8500

Light

tight box

20 cm

gate

signal

PulseGenerator

ChargeDivider

nXyter+ROC

slide3

Piotr Koczoń,GSI

CBMMarch 2009

H8500+nXyter+ROC - setup

ChargeDivider nXyter

ROC

slide4

Piotr Koczoń,GSI

CBMMarch 2009

Charge divider

(Simone Bianco)

H8500 multiplication factor ~106 @ 800V biasing voltage but sensitivity

of nXyter input ~ 5 mips (125000 e) => an adapter is necessary!!

The charge divider (details inhttp://cbm-wiki.gsi.de/cgi-bin/viewauth/Rich/CbmRichMeeting031208 )

is a C/R circuit:

PMT

N-XYTER

We prepared several boards with different sets of R1, R2, C1, C2:

S3

S5

slide5

Piotr Koczoń,GSI

CBMMarch 2009

Charge divider – 3rd try: not so bad

10 ns

15 ns

40 mV, S5

Qout

Qin

1.6 V

Qin /Qout = attenuation factor

More advanced simulations

by Tim Armbruster Uni HD

result in an attenuation factor of 48.71

H.C. Soltveit (one of nXyter developers)

claims that it should be possible to trimm

the chip such, that the charge divider

will be obsolete.

slide6

Piotr Koczoń,GSI

CBMMarch 2009

H8500 pinhole aperture

Pin holes

Aperture mask

slide7

Piotr Koczoń,GSI

CBMMarch 2009

System noise

Amplitude [ch]

Channel #

nXyter has a very sensitive input, it is very noisy.

Only by adjusting of global (and channel)

offsets and thresholds can be done operational.

slide8

Piotr Koczoń,GSI

CBMMarch 2009

H8500 signal readout

Ch#1 …

… Ch#64

Collected charge

slide9

Piotr Koczoń,GSI

CBMMarch 2009

H8500 – signal readout

18 channel# 82 112

Collected charge

Channel #

slide10

Piotr Koczoń,GSI

CBMMarch 2009

H8500 readout

78

82

108

slide11

Piotr Koczoń,GSI

CBMMarch 2009

H8500 readout

Pixelnumber - Channel number - correspondence

18 ->P4

78,82 -> P29, P30

112 -> P32

H8500 - rear side

slide12

Piotr Koczoń,GSI

CBMMarch 2009

H8500 readout

There ist obviously

a misaligment betw.

the mask and the PM

P4 not understood

?

slide13

Piotr Koczoń,GSI

CBMMarch 2009

To do 1) H8500 cross-talk – future plans

Hamamatsu claims for H8500: cross talk < 3% (electronics)

WLS can add an additional cross-talk between neighbouring pixels when a photon undergoes absorption-reemision in the WLS layer or falls inclined on the PMs entrance window

Photon transformed in WLS

Inclined photon

Propagation in WLS

WLS

Window (1mm)

PM structure

Simulations (Paola Solevi, Det.Lab. CERN): σ=3mm(WLS layer)

slide14

Piotr Koczoń,GSI

CBMMarch 2009

To do 2) Single photon counting capability

using H8500+CD+nXyter+ROC

Single Photon Counting capability

has been demonstrated (Dubna 2008)

in a coincidence measurement

with 2“ Hamamatsu X2020 and Picoscope.

SPC has to be also proved for H8500

with nXyter!

Single photon?

Double hit?

slide15

Piotr Koczoń,GSI

CBMMarch 2009

Ad 2) Single photon counting capability

using H8500+CD+nXyter+ROC

deltaT[ns]

Channel #

Coincidence measurement using nXyter system

slide16

Piotr Koczoń,GSI

CBMMarch 2009

  • Conclusions (Part 1)
  • nXyter+ROC with CD seem to work
  • with H8500
  • Further measurements of
  • a) cross talk between pixels with and w/o
  • WLS coating
  • b) single photon counting capability
  • with nXyter system
  • are necessary
slide17

Piotr Koczoń,GSI

CBMMarch 2009

  • WLS – summary
  • P.Koczoń, C.Höhne, A.Braem
  • C.Joram, M. van Stenis
  • choice of the wavelength shifter material
  • silicon pads with WLS
slide18

Piotr Koczoń,GSI

CBMMarch 2009

Choice of the WLS material

  • Several WLS materials have been tested
  • (TPB, pTerphenyl, YellowX)
  • Different coating methods (evaporation,
  • spraying)
  • evaporated p-Terphenyl shows the highest gain
  • ageing in CO2 not (yet) observed
  • timing properties not studied
slide19

Piotr Koczoń,GSI

CBMMarch 2009

Integrated QE of pTer and TPB

as function of photon energy

extrapolation

pTerphenyl shows the highest integrated gain

slide20

Piotr Koczoń,GSI

CBMMarch 2009

WLS embeded in silicon pads

WLS - Si pad

Advantages:

1) Much easier production

as compared to evap.

procedure

2) Can be prepared in

advance in different

thicknesses and

WLS concentrations

3) Can be changed on

the PM at any time

4) Can be easily exchanged

in case of damage

5) WLS material protected

from chem. influences

Window (1mm)

PM structure

~0.3 mm

? Does it work at all ?

?? Is thickness an issue ??

slide21

Piotr Koczoń,GSI

CBMMarch 2009

Thank You !

slide22

Piotr Koczoń,GSI

CBMMarch 2009

Cross-talks - setup

HV

Light guide bundle

LED

H8500

grey filter

Light

tight box

XY-table

PulseGenerator

signal

DAQ

gate

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