Speaker
Description
Low Gain Avalanche Diodes (LGADs) represent the state-of-the-art in timing measurements and will instrument the future timing detectors of ATLAS and CMS for the High-Luminosity LHC. While initially conceived as a sensor for charged particles, the intrinsic gain of LGADs makes it possible to detect low-energy X-rays with good energy resolution and excellent timing (tens of picoseconds). Using the Stanford Synchrotron Radiation Lightsource (SSRL) at SLAC and the Sirius Lightsource at Laboratorio Nacional de Luz Sincrotron (LNLS), several LGADs and AC-LGADs designs were characterized with energies ranging from 5 to 70keV and beam spots from nanometric to micrometric sizes. Both facilities provide 10ps pulsed X-ray bunches separated by 2ns intervals with very low energy dispersion ($\delta E/E<10^{-4}$). The tested LGADs are prototypes from several manufacturers -- fabricated with different thickness and gain layer designs -- and were read out using fast amplification boards and high bandwidth, high sampling rate oscilloscopes. The charge collection and multiplication mechanism were simulated using Geant4 and TCAD Sentaurus, providing an important handle for interpreting the data. In this contribution, the results of the data analysis and simulation will be presented.
| Type of presentation (in-person/online) | in-person presentation |
|---|---|
| Type of presentation (scientific results or project proposal) | Presentation on scientific results |
