Abstract
Many years of research and development of High Voltage Monolithic Active Pixel Sensors (HVMAPS) have culminated in the final design for the Mu3e pixel sensor. MuPix10 is a fully monolithic sensor with an active pixel matrix size of $20\times20\,\mathrm{mm}^2$ produced in the $180\,\mathrm{nm}$ HV-CMOS process at TSI Semiconductors. The pixel size is $80\times80\,\mathrm{\mu m}^2$. Hits are read out using a column-drain architecture and sent over up to four serial links with up to $1.6\,\left.\mathrm{Gbit}\middle/\mathrm{s}\right.$ each. By means of DC/DC converters and exclusive usage of on-chip biasing, MuPix10 is fully operable with a minimal set of electrical connections. This is an integral requirement by the Mu3e experiment since it enables the construction of ultra-thin pixel modules with $0.1\,$% of a radiation length per layer. First results from lab characterisation and testbeam campaigns are presented.
Highlights
The Mu3e experiment [1] is searching for the lepton flavor violating decay μ → eee with an unprecedented sensitivity of 1 in 1016 decays
The High Voltage Monolithic Active Pixel Sensor (HVMAPS) technology [2] was chosen to enable the construction of this detector
Following this simple picture and the extrapolation from the MuPix8 results, the new routing scheme reduces the crosstalk amplitude to 5% of the initial pulses amplitude
Summary
The Mu3e experiment [1] is searching for the lepton flavor violating decay μ → eee with an unprecedented sensitivity of 1 in 1016 decays. The MuPix10 [8] chip fulfils the specifications to build fully operational Mu3e tracker modules. This includes the final sensor size and a minimal chip interface. This material stack has only two aluminium layers for the HDI as depicted in figure 1(b) These two layers provide power and the high-voltage bias, as well as control and data lines for the chip, which are realised as differential pairs. The pixel line driver transmits the amplified signal via a point-to-point connection to the periphery to its digital partnercell This signal is AC-coupled to two parallel comparators which allow to apply different threshold schemes for hit detection and time sampling. ADC can measure key voltages on the chip and send out the measured values via the data link to provide crucial information e.g. the threshold levels and the chip temperature
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