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4–6 Jun 2018
Hamburg
Europe/Zurich timezone

A new model for the TCAD simulation of the silicon damage by high fluence proton irradiation

4 Jun 2018, 16:10
20m
Auditorium (Hamburg)

Auditorium

Hamburg

DESY, CSSB (Blg. 15)

Speaker

Dr Joern Schwandt (Hamburg University (DE))

Description

For the high-luminosity phase of the Large Hadron Collider (HL-LHC), at the
expected position of the innermost pixel detector layer of the CMS and ATLAS
experiments, the estimated equivalent neutron fluence after 3000 fb1
is 21016 neq/cm2, and the IEL (Ionizing Energy Loss) dose
in the SiO2 is 12 MGy. The optimisation of the pixel sensors and the
understanding of their performance as a function of fluence and dose makes a
radiation damage model for TCAD simulations, which describes the available
experimental data, highly desirable. The currently available bulk-damage
models are not able to describe simultaneously the measurements of dark
current (I-V),capacitance-voltage (C-V) and charge collection efficiency (CCE) of pad diodes for fluences 11015 neq/cm2.
Therefore, for the development and validation of a new accurate bulk damage model
we use I-V, C-V and CCE measurements on pad diodes available within
the CMS-HPK campaign and data from samples irradiated recently with 24 GeV/c protons. For the determination of the radiation-induced damage parameters we utilise the "optimiser" of Synopsys TCAD, which allows the minimisation of the difference between the measured and simulated I-V, C-V and CCE. The outcome of this optimisation, the Hamburg Penta Trap Model (HPTM), provides a consistent and accurate description of the measurements of diodes irradiated with protons in the fluence range from
31014 neq/cm2 to 1.31016 neq/cm2.

Author

Dr Joern Schwandt (Hamburg University (DE))

Co-authors

Christian Scharf (Hamburg University (DE)) Dr Eckhart Fretwurst (Hamburg University (DE)) Prof. Erika Garutti (Hamburg University (DE)) Dr Georg Steinbrueck (Hamburg University (DE)) Prof. Robert Klanner (Hamburg University (DE))

Presentation materials