Performance of the large scale HV-CMOS pixel sensor MuPix8

Abstract

The Mu3e experiment is searching for the charged lepton flavour violating decay ${\mu }^{+}\to e^{+}{e}^{-}{e}^{+}$, aiming for an ultimate sensitivity of one in $10^{16}$ decays. In an environment of up to $10^9$ muon decays per second the detector needs to provide precise vertex, time and momentum information to suppress accidental and physics background. The detector consists of cylindrical layers of $50\mu \text{m}$ thin High Voltage Monolithic Active Pixel Sensors (HV-MAPS) placed in a $1\text{T}$ magnetic field. The measurement of the trajectories of the decay particles allows for a precise vertex and momentum reconstruction. Additional layers of fast scintillating fibre and tile detectors provide sub-nanosecond time resolution. The MuPix8 chip is the first large scale prototype, proving the scalability of the HV-MAPS technology. It is produced in the AMS aH18 $180\text{nm}$ HV-CMOS process. It consists of three sub-matrices, each providing an untriggered datastream of more than $10\text{MHits}/\text{s}$. The latest results from laboratory and testbeam characterisation are presented, showing an excellent performance with efficiencies $>99.6\text{\%}$ and a time resolution better than $10\text{ns}$ achieved with time walk correction.

References in corpus (8)

• The DESY II Test Beam Facility
• Research Proposal for an Experiment to Search for the Decay μ -> eee
• The MuPix System-on-Chip for the Mu3e Experiment
• The MuPix Telescope: A Thin, high Rate Tracking Telescope
• MuPix7 - A fast monolithic HV-CMOS pixel chip for Mu3e
• Irradiation study of a fully monolithic HV-CMOS pixel sensor design in AMS 180 nm
• Efficiency and timing performance of the MuPix7 high-voltage monolithic active pixel sensor
• Electrical characterization of AMS aH18 HV-CMOS after neutrons and protons irradiation

Cited by in corpus (6)

• Technical design of the phase I Mu3e experiment
• Introduction to Charged Lepton Flavour Violation
• The Mu3e Data Acquisition
• Data Flow in the Mu3e DAQ
• Mechanics, readout and cooling systems of the Mu3e experiment
• Advanced muon-spin spectroscopy with high lateral resolution using Si-pixel detectors