SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 146: DAQ Systems, Exp. Methods
T 146.3: Vortrag
Donnerstag, 23. März 2023, 18:00–18:15, POT/0106
Techniques for the investigation of segmented sensors using the Two Photon Absorption – Transient Current Technique — •Sebastian Pape1, 2, Michael Moll1, Esteban Curras1, and Marcos Fernandez Garcia1, 3 — 1CERN — 2TU Dortmund University — 3Instituto de Física de Cantabria
The Two Photon Absorption - Transient Current Technique (TPA-TCT) is a technique for the characterisation of radiation detectors with three dimensional resolution. The TPA-TCT setup at CERN is designed for the investigation of silicon based detectors and uses a 430 fs pulse fiber lasers, with a wavelength of 1550 nm, which is in the quadratic absorption regime of silicon. Highly focusing optics are used to only generate excess charge carriers in a small volume (approximately 1µm × 1µm × 20µm) around the focal point of the laser beam, which enables a resolution in all three spatial directions. This three dimensional resolution is particular useful for the investigation and characterisation of segmented detectors. This talk introduces to the TPA-TCT and the setup at CERN. Further, the weighted prompt current method is presented, which allows to investigate the electric field of segmented sensors. The method is demonstrated on various segmented sensors: a HV-CMOS CCPDv3, a Micron strip detector, and a passive CMOS strip detector. Further, the mirror technique is presented, which exploits a reflection of the rear side, to probe below front surface metallisations.