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

X. Yang,S. Alderweireldt，X. X. Zheng,X. A. Zhuang

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detector...（2020）

Cited 27|Views17

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 < vertical bar eta vertical bar< 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 signals with a fast rising edge. It significantly improves the signal-to-noise ratio. The required average timing resolution per track for a minimum ionizing 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 1MeV neutron-equivalent fluence up to 2.5x 10(15) n(eq)/cm(2) including a safety factor of 1.5 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-ups 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.

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Key words

Low-Gain Avalanche Detector,HGTD,Timing Detector

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