Speaker
Description
Summary
High Voltage Monolithic Active Pixel Sensors (HV-MAPS) are thin, fast particle detectors suitable for the construction of large area tracking layers in high precision experiments. The latest development of the MuPix chip, planned to be used for the Mu3e experiment at PSI and the P2 Experiment in Mainz, is being tested at multiple accelerator facilities. One of these test locations is the Mainzer Mikrotron (MAMI), which is a continuous wave electron accelerator in the Institute for Nuclear Physics in Mainz. With energies up to 1.6 GeV and beam currents up to 100 µA, MAMI can provide a very narrow beam of electrons which can be used for beam tests in various ways. While the detectors can be placed directly in the beam to study high rate behaviour, MAMI can also produce a secondary high energy triggered photon beam of known energies.
In this presentation, the test beam facilities in Mainz are presented and two exemplary measurements are introduced. One is a study of the response of the MuPix to high energy photons, which represent an important background in the P2 experiment. The second is a high rate test, where up to 2.2 MHz of electrons were concentrated in a spot only 300 pixels in size. This demonstrated the high rate capability of the MuPix, but also revealed an unexpected charge-up phenomenon which makes the pixels fire without any particle passing through.
