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Thoms Bergauer (HEPHY Vienna)
23 July 2012
Sensor Irradiations and Testbeams
12th B2GM Bad Aibling
Sensor Irradiations and Testbeams
2Thoms Bergauer (HEPHY Vienna)
Contents
• Neutron Irradiation of HPK mini sensor• Plan for beam test in October 2012
23 July 2012
Sensor Irradiations and Testbeams
Neutron Irradiation
• Nuclear Reactor in Vienna
TRIGA Mark II (250kW)
• Irradiation planned for:
– HPK Baby DSSDs
– Micron Baby DSSDs
Max sensor size limited to irradiation
capsule (cylinder: length 10cm, diameter
2,5cm)
Micron Baby did not fit into capsule
only HPK Baby irradiated
• Irradiation performed on March 6th
3Thoms Bergauer (HEPHY Vienna)23 July 2012
Sensor Irradiations and Testbeams
4Thoms Bergauer (HEPHY Vienna)
Impressions
23 July 2012
Sensor Irradiations and Testbeams
5Thoms Bergauer (HEPHY Vienna)23 July 2012
Belle sensors have been irradiated to 2E12 and 1E13 neutron equivalent
..V
I
Fluence Monitoring
Calibration run:
• diodes irradiated to different
fluences
• leakage currents measured
• Alpha and Kappa determined
Actual irradiation:
• Fluence has been
determined before the run
• controlled by leakage current
measurements with CMS
diodes
Sensor Irradiations and Testbeams
6Thoms Bergauer (HEPHY Vienna)23 July 2012
Reactor Spectrum
Reactor spectrum -> damage is caused by thermic and fast neutrons
Damage caused per Energy Measured spectrum
Damage function
Sensor Irradiations and Testbeams
7Thoms Bergauer (HEPHY Vienna)
Results of HPK Mini Sensors
• Two modules to two different fluences: 2E12 and 1E13
• Although sensor should be stored in freezer to stop diffusion of bulk
damage (reverse annealing), sensor was left at room temperature for
practical reasons – had to stay in reactor pool for weeks at ~30degC
23 July 2012
SNR unirradiated irradiated ratio
HPK baby 1(2E12 n/cm2)
p-side 27.6 15.8 0.57
n-side 24.8 15.9 0.64
HPK baby 3(1E13 n/cm2)
p-side 24.7 5.6 0.23
n-side 23.4 NaN -
Sensor Irradiations and Testbeams
8Thoms Bergauer (HEPHY Vienna)
HPK neutron irradiation results
23 July 2012
Noise p-side
HPK Baby 1 HPK Baby 3
unirradiated
irradiated
1.1
2.8
1.1
3.0
1.7
4.9
1.9
4.6
Sensor Irradiations and Testbeams
9Thoms Bergauer (HEPHY Vienna)
HPK neutron irradiation results
23 July 2012
Noise n-side
HPK Baby 1 HPK Baby 3
unirradiated
irradiated
1.1
2.8
1.1
4.9
1.7
6.2
2.0
7.7
Sensor Irradiations and Testbeams
10Thoms Bergauer (HEPHY Vienna)
SVD TESTBEAM 2012
23 July 2012
Sensor Irradiations and Testbeams
11Thoms Bergauer (HEPHY Vienna)
Schedule
• CERN SPS H6 Beamtime: 12. to 19. October (8:00 to 8:00)
• Gamma Irradiation at SCK-CEN Mol (Belgium) from 19. to 26. October
• CERN SPS H6 parasitic running with ATLAS colleagues from 27. October to 2. November
23 July 2012
Sensor Irradiations and Testbeams
12Thoms Bergauer (HEPHY Vienna)
CERN SPS Testbeam
What to test:
• Final large Micron sensors (resolution studies)
• Micron baby sensors with optimized p-stop pattern
• Newly built 2-DSSD-Origami,
• Old 1-DSSD-Origamis with different grounding scheme
(noise problem during last year’s beam test)
Moreover:
• CO2 cooling system (already used in 2011)
• Linux-based TuxDAQ software (new!)
23 July 2012
Sensor Irradiations and Testbeams
Gamma Co-60 Irradiation in Belgium
• 2010: BRIGITTE facility provided
70 Mrad in 1 day -> 100 degC
temperature
• 2012: RITA facility to provide 70
Mrad in 6 days -> max. 30 degC
DUTs:
• Final Micron DSSDs
• neutron-irradiated HPK baby
sensors (mixed-irrad)
• Various passive material (e.g.
Airex, PCBs, cooling clamp, Sil-
Pad,…)
13Thoms Bergauer (HEPHY Vienna)23 July 2012
Sensor Irradiations and Testbeams
14Thoms Bergauer (HEPHY Vienna)
Summary
• Tough program starting mid October with– One week beam test (CERN)
– One week gamma irradiation (Belgium)
– One week beam test (CERN)
– B2GM November (Japan)
• Main Goals:– Acceptance of final Micron sensors to be able to place order for mass
production immediately afterwards (critical path for schedule!)
– Determine resolution (residuals) of both, rectangular HPK and trapezoidal
Micron sensors
– Show performance after combined neutron and gamma irradiation
– Test many of the materials to be used for support, cooling, mechanics under
gamma irradiation
23 July 2012