1. Irradiated FBK 3D sensor lab tests
Enver Alagoz1
On behalf of CMS 3D collaboration
1Physics Department, Purdue University, West Lafayette, IN US
15 March 2012

2. Introduction Irradiation 800 MeV protons/cm2 at Los Alamos
Fluences: 1E15, and 5E15 p/cm2
No annealing applied
All ROCs work after irradiation
Lab measurements performed in the thermal chamber
Leakage current
Noise
Source data

3. Sensors p+ and n+ electrodes pass through p+ substrate completely
Guard rings
200 μm thickness
ATLAS08 batch (2010)

4. Cold setup Cold setup for irradiated 3D sensor testing
Environmental chamber
-35 °C < T < 200 °C
Humidity control
Works with CAPTAN and PSI DAQ systems
Good for sensor IV measurements and ROC calibrations at cold
Manual temperature control
Purdue cold test setup
Sensor
ROC
Bump bonds
VHDI
Base
plate
Adhesive
Wire
bond
Bias wire

5. Cold setup Purdue cold test setup HV Sensor Sr-90 source
Linear actuator
Purdue cold test setup
Temperature sensor

6. Thermal measurements in the chamber
Infrared camera placed in the chamber to measure the sensor temperature
Thermal chamber at 10 °C
Thermal image of sensor at emissivity = 1
Purdue cold test setup

7. Thermal measurements in the chamber
Thermal chamber at 10 °C
ROC is ON
pcb
ΔT = 13 °C
--- temperature
sensor
ROC is OFF

8. ROC tests
Sensor: 1E_1_W8
Φ = 5E15 p/cm2

9. IV measurements
Thermal chamber at -20 °C

10. Noise tests
Thermal chamber at -20 °C

11. Source testing Thermal chamber at -20 °C
Sr-90 source: 1 mCi, Eβ = ΜeV
Random trigger used
Thermal chamber at -20 °C
-15V
Φ = 1E15 p/cm2
1 Vcal = 65 e-
MP = 10.6 ke- (Thickness: 200 μm)

12. Source charge collection scan
Sr-90 source: 1 mCi, Eβ = ΜeV
Random trigger used
Thermal chamber at -20 °C
Landau convoluted Gaussian fit
-15V
Φ = 1E15 p/cm2

13. Charge collection scans
Thermal chamber at -20 °C

14. Source testing: pre- and post-irradiation

15. Summary All irradiated FBK sensors work
All ROCs works after irradiation
Lab measurements performed in the thermal chamber at -20 °C
Thermal measurements suggest sensor temperature is -7 °C (ROC ON) when thermal chamber at -20 °C due to ΔT = 13 °C
IV, noise scan, and source testing done
Negligible increase in noise
Leakage current increased
Few volts increase in depletion voltage
Signal LOSS
1E 43% after 1E15 p/cm2
1E 50% after 5E15 p/cm2
2E 14% after 1E15 p/cm2
4E 14% after 1E15 p/cm2