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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, reaching tens of picoseconds. Recently, new topologies
for producing segmented arrays with micrometric spatial resolution may
enable the use of these devices for imaging X-rays applications. Using
the Stanford Synchrotron Radiation Lightsource (SSRL) at SLAC (US) and
the Sirius Lightsource at Laboratorio Nacional de Luz Sincrotron (LNLS)
in São Paulo, Brazil, several LGAD designs were characterized with
energies ranging from 5 to 70keV and beam spots ranging from nanometric
to millimetric sizes. Both facilities provide 10ps pulsed X-ray bunches
separated by 2ns intervals with very low energy dispersion. 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 talk, the analysis and results from
several test beam campaigns will be discussed, aiming potential
applications in the photon sciences.
Speaker : Marco Leite is a Senior Physicist at the University of São
Paulo (USP) Physics Institute in Brazil. He earned his PhD in Physics
from USP in 1999, and conducted his postdoctoral research at the
Brookhaven National Laboratory as a fellow from São Paulo Research
Funding Agency (2000-2002). With three decades of experience in detector
R&D and High Energy Physics data analysis, he is a fellow of the
Brazilian National Research Council and coordinates the ATLAS-Brazil
Cluster activities as National Representative in the collaboration,
where he also leads the Brazilian contribution to the ATLAS High
Granularity Timing Detector project.
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