23 July 2012 Thoms Bergauer (HEPHY Vienna) Sensor Irradiations and Testbeams 12 th B2GM Bad Aibling

Thoms Bergauer (HEPHY Vienna)

23 July 2012

Sensor Irradiations and Testbeams

12th B2GM Bad Aibling


2Thoms Bergauer (HEPHY Vienna)

Contents

• Neutron Irradiation of HPK mini sensor• Plan for beam test in October 2012

23 July 2012


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



Impressions

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



Reactor Spectrum

Reactor spectrum -> damage is caused by thermic and fast neutrons

Damage caused per Energy Measured spectrum

Damage function



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 -



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



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



SVD TESTBEAM 2012

23 July 2012



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



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


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,…)




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

Documents

23 July 2012 Thoms Bergauer (HEPHY Vienna) Sensor Irradiations and Testbeams 12 th B2GM Bad Aibling