December 2005 1 Status of MRS photodiodes ND280 Convener’s Meeting, 9 June 2006 Yury Kudenko INR,...

December 2005 December 2005 1

Status of MRS photodiodes

ND280 Convener’s Meeting, 9 June 2006

Yury Kudenko INR, Moscow


MRS photodiodes: basic information parameters test resultsSci/WLS detectors for SMRD: geometry parameters beam test presented in

Physics/0606037

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MRS APDManufacturer CPTA, MoscowSensitive area 1.1 mm2

Number of pixels 556Geometrical efficiency 75-80 %Bias voltage range 25-50 VPower consumption 0.025 mW Gain ≤ 106

Sensitivity to magnetic field ( 4T) no

1.17 mm

3About 300 devices were tested by now


PDE, cross-talk, dark rate

operational voltage 4


Linearity

5


Recovery time

t

First pulse 50, 100, 300, 600 p.e.

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Lifetime update

•18 MRS diodes were heated for 30 days•All showed good stability of l.y.

2 MRS APD

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• About 300 CPTA devices are studied for more than 2.5 years 4 devices are dead: 1 damaged mechanically 1 during temperature test 2 under operation at room temperature

Now: 20 photodiodes are under bias voltage for 40 days ALL are OK Devices look very reliable and stable

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d 4,0mm

d2,9-3,1mm

d2,54mm

1,60mm

1,60

mm

h1=

1,5m

m m

ax10

,0 m

m m

in

d=0,4-0.43mm

h2=0,5 - 0,51mm

h3=1/2 h2

h3h2

Корпус металлокерамическийNew compact package for MRS diodes

MRS APD octagonalSide-to-side 1.17 mmSensitive area 1.1 mm2 Package CeramicsDiameter about 4 mmThickness 1.5–2.0 mmPIN distance 2.5 mmTolerance 20 m

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Conclusion & Plan

Main parameters: Dark rate (at 0.5 p.e.) ≤ 1MHz (room temperature 22oC) PDE 10-16 % Long time stability goodTemp gradient of PDE (gain corrected) ~ -1.8%Cross talk ≤ 5-6 %

Plan:New compact package for MRS diodes is under development at MARS Company (Russia) - INR-CPTA-MARS meeting on 15 June for design and production - First 20 ceramics packages June 2006 - MRS diodes in ceramics July 2006 - Test of MRS diodes in new package August 2006Design of optical connector depends on new package Several options are under discussion For SMRD detectors - August/September if ceramics OK.

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SMRD modules with MRS readout (1)

One module consists of 4 counters One counter 87 x 17 x 1 ccm Extruded scintillators Bent Y11 WLS fibers Two end readout using MRS APD through optical connectors Package: Two Al bars each with 4 holes for readout Al foil of 300-400 mkm thickness Epoxy glue Should be studied in tests : Parameters Long time stability Temperature effects Fiber/MRS connection, optical isolation Humidity Mechanical performance…. 11



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December 2005 1 Status of MRS photodiodes ND280 Convener’s Meeting, 9 June 2006 Yury Kudenko INR,...

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