Feb 21 – 25, 2022
Vienna University of Technology
Europe/Vienna timezone

Characterisation of the charge collection in LGAD sensors with a newly developed table-top TPA-TCT system

Not scheduled
Vienna University of Technology

Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Recorded Presentation Semiconductor Detectors


Sebastian Pape (Technische Universitaet Dortmund (DE))


The Two Photon Absorption – Transient Current Technique (TPA-TCT) uses fs-pulsed infrared lasers, with photon energies below the silicon band gap. Excess charge carriers are generated mainly in a small volume (approximately 1µm × 1µm × 20µm) around the focal point of the laser beam, enabling a resolution in all three spatial directions. Compared to conventional Single Photon Absorption – TCT, the resolution perpendicular to the incident laser beam is typically increased by a factor of ten. Following the initial success of the method, a compact TPA-TCT setup was developed at CERN. The TPA-TCT setup and various measurements with the focus on the charge collection and the gain suppression in LGAD sensors will be presented.

Primary author

Sebastian Pape (Technische Universitaet Dortmund (DE))


Anja Himmerlich (CERN) Esteban Curras Rivera (CERN) Francisco Rogelio Palomo Pinto (Universidad de Sevilla (ES)) Ivan Vila Alvarez (Instituto de Física de Cantabria (CSIC-UC)) Marcos Fernandez Garcia (Universidad de Cantabria and CSIC (ES)) Michael Moll (CERN) Moritz Oliver Wiehe (Albert Ludwigs Universitaet Freiburg (DE)) Raul Montero Santos (Universidad del Pais Vasco)

Presentation materials