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Published June 2021 | public
Journal Article

Gamma-Ray- and Neutron-Induced Photocurrent and Readout Noise in LYSO+SiPM Packages


Lu_(2(1–x))Y_(2x)SiO₅ (LYSO) crystals readout by a silicon photomultiplier (SiPM) will be used in the barrel timing layer of a precision timing detector for the Compact Muon Solenoid (CMS) experiment at the High-Luminosity Large Hadron Collider (HL-LHC). This detector is expected to be exposed up to 5-Mrad γ-ray dose, 2.5×10¹³ charged hadrons/cm², and 3×10¹⁴n_(eq)/cm² at the HL-LHC for 10 years of operation. We present results of the photocurrent in LYSO+SiPM packages induced by Co-60 γ-rays and Cf-252 neutrons of the expected dose rate and neutron flux, respectively. The γ-ray-induced readout noise is about 30 keV, which is negligible when compared to the 4.2-MeV signal from the minimum ionization particle signals. The neutron-induced readout noise is about 7 keV, which is more than a factor of 4 smaller than that from the γ-rays.

Additional Information

© 2021 IEEE. Manuscript received March 11, 2021; revised April 15, 2021; accepted April 18, 2021. Date of publication April 27, 2021; date of current version June 14, 2021. This work was supported in part by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award DE-SC0011925, in part by Fermilab under Grant PO#661273, and in part by Prime DOE under Grant DE-AC02-07CH11359. The authors are grateful to the CMS collaborators, H. B. Newman, S. Xie, C. Peña, and the CMS Caltech Group for useful discussions and feedback. Maria Spiropulu thanks S. Miscetti and L. Bauerdick for early discussions on the project.

Additional details

August 20, 2023
October 23, 2023