Research Of High Energy Beam Telescope Based On Monolithic Active Pixel Sensor

With the development of Particle Physics,larger particle detectors with better performance are needed.During the development of those new detectors,measurements with test beam,whose particle energy and direction are manipulatable,are needed to verify the function and calibrate the performance of the detectors.The coordinates and directions of imping particles have to be determined with a much higher precision those of the detectors under investigation,and it is usually achieved by beam telescopes.In order to achieve better performance,silicon pixel detectors are commonly used for such telescopes,for their precise spatial resolution,low noise,fast reaction and very low material budget.EUDET,as the very first silicon pixel telescope developed by DESY at 2010,has been copied and used for the test beams around the world during the past several years.But as the particle rate of the beam increases,the trigger rate and the fake-hit rate(noise)of EUDET have limited the use of the beam and the performance of track reconstruction.To match the requirement of DESY test beam,we studied a new telescope development based on ALPIDE,a MAPS designed for ALICE ITS upgrade.Based on the investigation and simulation of beam telescopes,we introduced the design of the ALPIDE beam telescope.It is mainly consisted of electronics,trigger system,mechanics,DAQ software and track reconstruct solution.With high trigger rate and low noise,the track reconstruction would be much more simplified than EUDET system.In this work,we have developed an ALPIDE verify electronics and a 6-layer prototype of ALPIDE beam telescope.The result of laboratory tests and beam tests show that the prototype achieves a trigger rate of 200kHz,a fake-hit rate lower than 4.2 ×106/event with 99.8%efficiency,and a track resolution of 3.11?m at 6 GeV.The prototype is proved to have matched all the requirements of the DESY test beam.Besides,the prototype is completely compatible with the EUDET system,which enables beam users to shift to ALPIDE system easily.