Speaker
Description
Low Gain Avalanche Detectors (LGADs), implemented as 𝑛++−𝑝+−𝑝, show outstanding precision timing performance when detecting high-energy charged particles and will be used in the timing detectors for the upcoming High Luminosity LHC ATLAS and CMS detector upgrades. Therefore, studying the LGAD technology and their degradation with irradiation will be an important task for the newly formed DRD3 collaboration. The efforts to gain a more profound understanding of the LGAD degradation with irradiation as well as complementing studies of novel LGAD technologies will be presented in this talk.
The first part of the talk will summarize the plans and first results of an extensive LGAD irradiation study to compare the effect of different proton energies on the gain layer of the devices. The investigation of radiation-induced degradation produced by low energy protons is of special interest since it demonstrates the limits of the Non-Ionizing Energy Loss (NIEL) scaling. Over 100 LGAD samples produced by Hamamatsu Photonics (HPK) as well as devices with differently carbonated gain layers produced by Centro Nacional de Microelectrónica (CNM)-IMB are included in the study. Electrical characterization, radiation-induced acceptor removal and gain reduction of a selected subset of samples will be presented.
The second part of the talk will cover studies on the novel nLGAD technology. Due to the difference in multiplication mechanisms for holes and electrons, the detection performance of LGADs is significantly reduced for low penetrating particles. A novel concept of an LGAD detector, the nLGAD (𝑝++−𝑛+−𝑛), was designed and fabricated at CNM and tested at the SSD laboratory at CERN. Studies were conducted to understand the performance of nLGAD detectors, using techniques such as TPA-TCT. Investigations also cover impact ionization and its temperature dependence, as well as gain reduction mechanisms. Gain response measurements were conducted using laser light of different wavelengths. Prospects should be given for radiation studies to answer fundamental questions, for example whether donor removal occurres in the gain layer equivalent to acceptor removal in high-energy physics LGADs.
| Type of presentation (in-person/online) | in-person presentation |
|---|---|
| Type of presentation (scientific results or project proposal) | Presentation on scientific results |
