Emanuele Cavallaro - Transient Current Technique - Pulsed light for particle detector characterization

Wednesday 28 Feb 2018, 13:00 → 14:00 Europe/Madrid

Seminar (IFAE)

Marc Manera (IFAE), Michael Leyton (IFAE), Stefano Terzo (IFAE)

In the Pixel group we are working on the development of silicon detectors for the new inner tracker of ATLAS. These devices are usually characterized at beam test facilities where minimum ionizing particles travel trough the detector and their impact position on the detector is provided by a high resolution telescope. In a laboratory it is not possible to achieve the same result with particles from radioactive sources since these cannot be properly collimated and their energy is not high enough to cross several planes of telescope. The Transient Current Technique (TCT) set-up is a table top system for the characterization of solid state detectors with a resolution of few micrometers using photons as ionizing particles. It records the electric pulses generated in the detector by a pulsed laser light and the analysis of these pulses can give useful information. Besides recording these signals the TCT set-up controls three movable stages that permit to adjust the focus of the laser and move the detector under test (DUT), and a power supply to bias the DUT. This makes the TCT set-up able to scan both in voltage and in position the DUTs. In the seminar the TCT set-up will be introduced and the result obtained by the analysis of different kind of detectors for the ATLAS upgrade (3D and HV-CMOS pixel detectors and low gain avalanche detectors) will be shown.