The implementation of resistive read-out in the design of silicon sensors places built-in charge sharing among neighboring pixels as the basic principle of operation. Resistive Silicon Detectors (RSD), exploiting the signals seen on the electrodes surrounding the impact point, achieve micron-level position resolution even with very large pixels. In this paper, results obtained with sensors...
In order to understand better the performance of LGADs, in particular in terms of Gain and breakdown voltage, it is important to know with high precision the structure of the devices and have a very accurate impact ionization model. There are several impact ionization models in the literature and many studies have been done in this respect, but no one is able to fit the empirical data taken in...
The radiation hardness of LGAD depends on the distribution and doping concentration of implanted Carbon and Boron. Based on Secondary Ion Mass Spectrometry profile of IHEP_IMEv2 LGAD devices, the impact of implantation dose and thermal load of Carbon to the radiation hardness of LGAD is discussed. A model based on the SIMS data is implemented to fit the accepter removal coefficient of LGADs...
Abstract: In this contribution we will present the first measurements on LGADs corresponding to our CNM’s second engineering run based on 6-inch, 50µm active layer thick, epitaxial wafers (6LG3 technology). Some of the wafers were carbon enriched using two different doses and one implantation energy. For the gain layer, samples were fabricated using different boron doses and diffusion times...
LGADs irradiated up to 6e15 n/cm2 with reactor neutrons were annealed at high temperatures between 300C and 450C. Annealing was for 30 minutes in steps of 50C. CV measurements were made after each annealing step and a significant increase of gain layer depletion voltage was observed. Charge collection and timing resolution were measured with electrons from Sr-90 showing beneficial effect of...
The Low-Gain Avalanche Detector (LGAD) with timing resolution better than 35(70) ps before (after) irradiation is the key technology that has been studied by many RD50 institutes and is going to be used in the ATLAS HGTD upgrade. The University of Science and Technology of China (USTC) has been developing LGAD sensors with the Institute of Microelectronics of the Chinese Academy of Sciences...
The High Granularity Timing Detector (HGTD) project of ATLAS will reduce the pile-up effect in HL-LHC by providing precise time measurement of tracks. The Low Gain Avalanche Detector (LGAD) with a time resolution better than 35(70) ps before(after) irradiation is the key technology that has been studied by many institutes. The Institute of High Energy Physics Chinese Academy of Science (IHEP)...
In this presentation I will overview our accumulated knowledge about limits of LGAD as studied using the low energy ions, low energy protons and femtosecond laser beams. A new insight into old data will be given as well. A proposal for a new experiment that will explore 30 MeV proton beams at the Cyclotron in Prague will be announced as well as the the future plans at RBI through Radiate user scheme.
In this presentation we will present the preliminary results from the interpad study in TI-LGADs using Femtosecond laser based SPA and TPA. The selected samples are from the latest FBK TI-LGAD production (RD50 project). To our best knowledge, the femtosecond laser based SPA and TPA has not been yet tested and tuned for the IP studies. .
The Two Photon Absorption – Transient Current Technique (TPA-TCT) setup at CERN uses fs pulse infrared fiber lasers, with a wavelength of 1550nm. Highly focusing optics are used to mainly 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. The setup was used to...
The recently observed saturation of the charge multiplication mechanism in LGAD devices has been studied and characterised with an infrared laser used to replicate the particle charge deposition ranging from 1 to 80 equivalent MIPs. The observations are compared to the response from beta particles and impinging protons with different energies. The influence of regions with high electric field...
In this contribution, the performances of several different guard-ring designs implemented in thin UFSD are compared. The sensors used in the analysis are part of the UFSD 4 production of the Fondazione Bruno Kessler.
The designs include different edge widths, numbers and layouts of floating guard-ring. The results include the measurement of noise and break-down voltage before and after irradiation.
Low Gain Avalanche Detectors (LGADs) are thin silicon detectors capable of providing measurements of minimum-ionizing particles with time resolution as good as 17 ps. These properties make LGADs the prime candidate technology for achieving 4D tracking in future experiments. Furthermore the fast rise time and short full charge collection time (as low as 1 ns) of LGADs are suitable for high...
Current and future collider experiments are reaching luminosities at which pile-up causes tracking of single particles to become near impossible when using only three spatial coordinates. However, with high enough timing resolution, an additional measurement coordinate could be introduced to unambiguously discern particle paths.
When it comes to ultra fast silicon detectors (UFSD), Low Gain...
