Deep Diffused Avalanche Photodiodes for Charged Particles Timing
Abstract
The upgrades of ATLAS and CMS for the High Luminosity LHC (HL-LHC) highlighted physics objects timing as a tool to resolve primary interactions within a bunch crossing. Since the expected pile-up is around 200, with an r.m.s. time spread of 180 ps, a time resolution of about 30 ps is needed. The timing detectors will experience a 1-MeV neutron equivalent fluence of about and cm for the barrel and end-cap regions, respectively. In this contribution, deep diffused Avalanche Photo Diodes (APDs) produced by Radiation Monitoring Devices are examined as candidate timing detectors for HL-LHC applications. To improve the detector's timing performance, the APDs are used to directly detect the traversing particles, without a radiator medium where light is produced. Devices with an active area of mm were characterized in beam tests. The timing performance and signal properties were measured as a function of position on the detector using a beam telescope and a microchannel plate photomultiplier (MCP-PMT). Devices with an active area of mm were used to determine the effects of radiation damage and characterized using a ps pulsed laser. These detectors were irradiated with neutrons up to cm.
Cite
@article{arxiv.1903.07482,
title = {Deep Diffused Avalanche Photodiodes for Charged Particles Timing},
author = {M. Centis Vignali and P. Dias De Almeida and L. Franconi and M. Gallinaro and Y. Gurimskaya and B. Harrop and W. Holmkvist and C. Lu and I. Mateu and M. McClish and M. Moll and F. M. Newcomer and S. Otero Ugobono and S. White and M. Wiehe},
journal= {arXiv preprint arXiv:1903.07482},
year = {2019}
}