Layout and Performance of HPK Prototype LGAD Sensors for the High-Granularity Timing Detector

Abstract

The High-Granularity Timing Detector is a detector proposed for the ATLAS Phase II upgrade. The detector, based on the Low-Gain Avalanche Detector (LGAD) technology will cover the pseudo-rapidity region of $2.4<|\eta |<4.0$ with two end caps on each side and a total area of 6.4 $m^2$. The timing performance can be improved by implanting an internal gain layer that can produce signal with a fast rising edge, which improve significantly the signal-to-noise ratio. The required average timing resolution per track for a minimum-ionising particle is 30 ps at the start and 50 ps at the end of the HL-LHC operation. This is achieved with several layers of LGAD. The innermost region of the detector would accumulate a 1 MeV-neutron equivalent fluence up to $2.5\times 10^{15}c{m}^{-2}$ before being replaced during the scheduled shutdowns. The addition of this new detector is expected to play an important role in the mitigation of high pile-up at the HL-LHC. The layout and performance of the various versions of LGAD prototypes produced by Hamamatsu (HPK) have been studied by the ATLAS Collaboration. The breakdown voltages, depletion voltages, inter-pad gaps, collected charge as well as the time resolution have been measured and the production yield of large size sensors has been evaluated.

arXiv comment17 pages, 20 figures

References in corpus (5)

• First FBK Production of 50$\mu$m Ultra-Fast Silicon Detectors
• Development of a technology for the fabrication of Low-Gain Avalanche Detectors at BNL
• Beam test measurements of Low Gain Avalanche Detector single pads and arrays for the ATLAS High Granularity Timing Detector
• Comparison of 35 and 50 μm thin HPK UFSD after neutron irradiation up to 6*10^15 neq/cm^2
• Radiation Campaign of HPK Prototype LGAD sensors for the High-Granularity Timing Detector (HGTD)

Cited by in corpus (7)

• Silicon Sensors for Future Particle Trackers
• Low Gain Avalanche Detectors with Good Time Resolution Developed by IHEP and IME for ATLAS HGTD project
• Optimization of capacitive coupled Low Gain Avalanche Diode (AC-LGAD) sensors for precise time and spatial resolution
• Radiation Campaign of HPK Prototype LGAD sensors for the High-Granularity Timing Detector (HGTD)
• Radiation effects on NDL prototype LGAD sensors after proton irradiation
• Picosecond Timing Resolution Measurements of Low Gain Avalanche Detectors with a 120 GeV Proton Beam for the TOPSiDE Detector Concept
• Gain characterization of LGAD sensors with beta particles and 28-MeV protons