Speaker
Description
ATLAS experiment will be upgraded with High Granularity Timing Detector (HGTD) for the high luminosity runs at Large Hadron Collider after 2029. It will utilize LGAD detectors placed in very harsh radiation environment. During the R&D phase sensors with carbon enriched gain layer were designed showing sufficient radiation hardness after reactor neutron irradiations of up to $\Phi_{\mathrm{eq}}=2.5\cdot10^{15}$ cm$^{-2}$. The composition of the particles at HGTD will change with the distance from the beam pipe. Around 50% of the Non-Ionizing Energy Loss (NIEL) will come from charged hadrons at the innermost part of HGTD (12 cm) and around 10% at the outermost part (65 cm). In order to study the radiation damage of highly energetic charged hadrons, LGADs from HGTD pre-production were irradiated with 24 GeV p at CERN-PS. The acceptor removal constant of protons was found to be almost three times larger than that of the reactor neutrons at the same NIEL. After proton irradiations the sensors were irradiated also with neutrons. When accounted for the difference in acceptor removal constant the amount of removed acceptors in mixed irradiated samples scales with the sum of the delivered equivalent fluences of protons and neutrons. The impact on HGTD performance was simulated and although substantially higher removal for charged hadrons the running scenario of the HGTD is robust enough to allow efficient operation over the life time of the experiment.
| Type of presentation (in-person/online) | in-person presentation |
|---|---|
| Type of presentation (I. scientific results or II. project proposal) | I. Presentation on scientific results |
