FSD 01 Detectors Simulation Vs Measurements Sudip Chatterji and Indian Students (Ghosh P, Bansal Y, Joshi N and Sharma N ) GSI Helmholtz Centre for Heavy Ion Research GmbH STS Work Group Meeting 10 th January 2012

Outline 1.Motivation 2.Simulation Vs Measurements  Fluence 1e12 n/cm 2  Fluence 1e13 n/cm 2  Fluence 3e13 n/cm 2  Fluence 1e14 n/cm 2 3.Overview & Analysis

1. Motivation To study and verify the FSD Detectors IV & CV Characteristics To verify the Simulation module for FSD parameters using the models used previously Role of space charge effect on the Breakdown voltages To study and validate different models for annealing parameter. – To extract Annealing time constants

2.1.1 Simulation Vs Measurements Fluence ø=1e12(n/cm 2 )

2.1.2 Simulation Vs Measurements Fluence ø=1e12(n/cm 2 ) V FD {Measured} ~ 40V V FD {Simulated} ~ 44V Leakage current almost comparable Simulation results holds good

2.2.1 Simulation Vs Measurements Fluence ø=1e13(n/cm 2 )

2.2.2 Simulation Vs Measurements Fluence ø=1e13(n/cm 2 ) V FD {Measured} ~ 12V V FD {Simulated} ~ 15V Leakage current almost comparable Simulation results almost holds good

2.3.1 Simulation Vs Measurements Fluence ø=3e13(n/cm 2 )

2.3.2 Simulation Vs Measurements Fluence ø=3e13(n/cm 2 ) Pink curve => Good Detector – V FD {Measured} ~80 V – V FD {Simulated} ~ 90V – Leakage current almost comparable, Simulation results almost holds good Red curve => Bad Detector – V FD {Measured} ~ not observed – Leakage Current much higher than expected.

2.4.1 Simulation Vs Measurements Fluence ø=1e14(n/cm 2 )

2.4.2 Simulation Vs Measurements Fluence ø=1e14(n/cm 2 ) V FD {Measured} & {Simulated} = not observed BD {Measured} = 220V BD {Simulated} = 250V Leakage current almost comparable but Breakdown appear early in measurements (red & green) Impact of Qf Observed – Increasing the Qf Decreases Break Down voltage ( blue to pink ~ 8e11  1e12) – May be the Qf ~ 3e12 in measured Detectors

3.1 Simulation Vs Measurement Overview Measured Values for FSD 01Simulated Values for FSD 01

3.2 Simulation Vs Measurement Analysis Simulation results holds good with results from FSD01 Detectors. Leakage current is comparable in both the cases V FD {Measured} ~ V FD {Simulated} Type inversion observed after Fluence=1e13 n/cm 2 With some bad detectors, statistics in case of detectors becomes important to verify the simulation results.