The 39th RD50 Workshop (Valencia)

Session

TPA-TCT (Two-Photon Absorption Transient Current Technique)

17 Nov 2021, 12:40

ADEIT

Conveners

TPA-TCT (Two-Photon Absorption Transient Current Technique)

• Ivan Vila Alvarez (Instituto de Física de Cantabria (CSIC-UC))

57. Evidence of multistage charge collection in Si irradiated detectors operated as the monitors of intensive fragmented proton beams

Artem Shepelev (Ioffe Institute (RU)), Artem Shepelev (Ioffe Institute), Elena Verbitskaya (Ioffe Physico-Technical Institute RAS), Elena Verbitskaya (Ioffe Institute (RU)), Vladimir Eremin (Ioffe Institute (RU))

17/11/2021, 12:40

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,...

51. Thickness dependence of the Single Event Burnout bias threshold in fs-laser based mortality study on LGADs from different producers

Gordana Lastovicka Medin (University of Montenegro (ME))

17/11/2021, 13:00

Talk

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...

58. Updated IBIC and Ion-TCT study on LGAD at RB: Work in Progress on Effects of Screening in LGADs

Gordana Lastovicka Medin (University of Montenegro (ME))

17/11/2021, 13:15

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...

5. Towards an All-Fiber Femtosecond Laser System as Excitation Source in the Two-Photon Absorption – Transient Current Technique

Mrs Azahara Almagro-Ruiz (FYLA LASER)

17/11/2021, 14:45

Talk

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...

13. Gain suppression mechanism in LGADs and SEE studies in a RD53B chip measured with the TPA-TCT method

Sebastian Pape (Technische Universitaet Dortmund (DE))

17/11/2021, 15:05

Talk

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...

50. Compensation of TPA-TCT signal fluctuations using the 2nd harmonic

Ivan Vila Alvarez (Instituto de Física de Cantabria (CSIC-UC))

17/11/2021, 15:25

Talk

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

48. Effects of charge screening in LGADs

Gregor Kramberger (Jozef Stefan Institute (SI))

17/11/2021, 15:40

Talk

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.

44. Determining the Impact Ionisation Parameters for LGADs

Alissa Shirley-Ann Howard (Jozef Stefan Institute (SI))

17/11/2021, 16:00

Talk

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.

55. Discussion: TPA-TCT system and studies

Ivan Vila Alvarez (Instituto de Física de Cantabria (CSIC-UC))

17/11/2021, 16:20

Talk

60. Announcement: Trento Workshop in Freiburg

Ulrich Parzefall (Albert Ludwigs Universitaet Freiburg (DE))

17/11/2021, 16:50