Speaker
Description
The Mu3e experiment will search for the charged lepton flavour violating decay $ \mu^{+} \to e^{+}e^{-}e^{+} $ with a sensitivity of one in $ 10^{16} $ decays (in phase II). To reach this sensitivity a momentum resolution of 0.5 MeV/c and a vertex resolution of about 200 $ \mu $m is required.
The particle rate is given by the more than $ 10^{9} $ muon stops per second. All the hits will be readout using a continuous readout system. To achieve the specifications High Voltage Monolithic Active Pixel Sensors (HV-MAPS) are used for all layers of the tracking system. The chip developed for Mu3e is called MuPix. In the last years several prototypes were designed and tested. The first large prototype is the MuPix8 (1 x 2 cm$^{2}$) which has be successfully tested in the lab and using test beams. The next large MuPix, MuPix10, will be submitted by the end of 2019 and represents a final version prototype. The matrix contains 250 x 256 pixels, each pixel with size 80 $\mu$m x 80 $\mu$m. The total chip size is 20.66 x 23.18 mm$^{2}$. The signal is amplified in the pixel and then transmitted as an analog signal to the readout cell located in the chip periphery where the signal is discriminated with two comparators. The time information consists of 11 bits for the hit arrival time and 5 bits for the time-over-threshold. MuPix10 is based on a 180 nm HV-CMOS process.
In this talk the measurement results of the MuPix8 and the final design of the MuPix10 will be presented.
| Submission declaration | Original and unpublished |
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