December 2005 December 2005 1
Status of MRS photodiodes
ND280 Convener’s Meeting, 9 June 2006
Yury Kudenko INR, Moscow
December 2005 December 2005 2
MRS photodiodes: basic information parameters test resultsSci/WLS detectors for SMRD: geometry parameters beam test presented in
Physics/0606037
2
December 2005 December 2005 3
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
December 2005 December 2005 4
PDE, cross-talk, dark rate
operational voltage 4
December 2005 December 2005 5
Linearity
5
December 2005 December 2005 6
Recovery time
t
First pulse 50, 100, 300, 600 p.e.
6
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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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December 2005 December 2005 8
• 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
8
December 2005 December 2005 9
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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December 2005 December 2005 10
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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December 2005 December 2005 11
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
December 2005 December 2005 12
SMRD modules with MRS readout (2)
1 2
3 4
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December 2005 December 2005 13
SMRD modules with MRS readout (3)
1 2
3 4
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