Design, implementation and first measurements with the Medipix2-MXR detector at the Compact Muon Solenoid experiment

The Medipix detector is the first device dedicated to measuring mixed-field radiation
\nin the CMS cavern and able to distinguish between different particle types. Medipix2-MXR chips
\nbump bonded to silicon sensors with various neutron conversion layers developed by the IEAP
\nCTU in Prague were successfully installed for the 2008 LHC start-up in the CMS experimental
\nand services caverns to measure the flux of various particle types, in particular neutrons. They
\nhave operated almost continuously during the 2010 run period, and the results shown here are
\nfrom the proton run between the beginning of July and the end of October 2010. Clear signals
\nare seen and different particle types have been observed during regular LHC luminosity running,
\nand an agreement in the measured flux rate is found with the simulations. These initial results
\nare promising, and indicate that these devices have the potential for further and future LHC and
\nhigh energy physics applications as radiation monitoring devices for mixed field environments,
\nincluding neutron flux monitoring. Further extensions are foreseen in the near future to increase
\nthe performance of the detector and its coverage for monitoring in CMS.