Conveners
TPA-TCT (Two-Photon Absorption Transient Current Technique)
- Ivan Vila Alvarez (Instituto de Física de Cantabria (CSIC-UC))
Charge collection in Si p+-n-n+ detectors was studied in the in situ irradiation test at 1.9 K with intense 23 GeV proton beam fragmented in 400 ms spills in view of detector application as beam loss monitors in the LHC at CERN. The current pulse responses demonstrated a two-stage process of charge collection, in which, in the first stage, the current was induced by holes, and in the second,...
Gordana Lastovicka-Medin1, Mateusz Rebarz2, Gregor Kramberger3, Jakob Andreasson2 Tomas Lastovicka4, Jiri Kroll4, Kamil Kropielnicki2
1University of Montenegro
2Extreme Light Infrastructure
3Jozef Stefan Institute
4Czech Academy of Sciences
Different active thickness of LGADs and probing the sensitive depth from front and backside are exploited, The sensors used in this study...
Gordana Lastovicka-Medin1 , Milko Jaksic2 , Gregor Kramberger3 , Mauricio Rodriguez Ramos2 , Andreo Crnjac2 , Milos Manojlovic1
1 University of Montenegro,
2 Rudjer Boskovic Institute,
3 Jozef Stefan Institute
This work in progress is three folded. Firstly, gain anomalous behavior was studied in a such way that ion beams (C, He, Li, H+) and their energies were chosen so that Bragg...
Degradation of semiconductor detectors when exposed to high radiation rates leads to the necessity of development of tools and methods for characterization of these devices. One of these methods is the Two-Photon Absorption – Transient Current Technique (TPA-TCT) which provides spatially-resolved inspection of semiconductor detectors. This technique exploits the simultaneous absorption of two...
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 resolution in all three spatial directions. Following the initial success of the method, a compact...
We present the commissioning measurements of the new fiber femto-laser at IFCA equipped with a fully integrated optical bench for microfocusing, signal stability monitoring and focus imaging. Compensation of the TPA-TCT signal fluctuations using the second harmonic generated with a BBO crystal will be described
TCT was used to study the effect of ionization density on gain in different non-irradiated LGADs. A simple model was used to explain the screening and was verified by measurements.
Existing impact ionisation models and parameters for silicon do not accurately describe the behaviour seen in LGAD sensors, so new impact ionisation parameters specifically applicable to LGADs was determined using simulations and timing measurements of sensors from various producers. The resulting model and parameters will be presented.
