THPP02
NASU/INR, Kiev, Ukraine
CERN, Meyrin, Switzerland
The results of a performance study of the upgraded Radiation Monitoring System (RMS-R3) for the LHCb experiment are presented. The RMS-R3 is built out of the eight Metal-Foil Detectors (MFD) placed at 2 m from IP-8 around the beam pipe in a backward hemisphere. The system is designed for monitoring beams interaction rate (relative luminosity) and background at the LHCb nominal instantaneous luminosity of p-p collisions 5 times increased in RUN3. The feasibility of monitoring of relative contribution from the beams luminous region (IP-8) and collimators is illustrated by the data accumulated with a similar RMS during RUN1 and RUN2 campaigns. An advantageous feature of the MFD, its high radiation tolerance of a GGy level, originates from the principle of its operation due to secondary electron emission from a surface of a metal sensor resulting in a positive charge in it which is readout by charge integrator. Simple structure of the detector modules, low operating voltage (about 20 volts), commercially available DAQ boards further improve their figure of merit. The RMS-R3 perfect linear response in a dynamical range of 1:100000 is demonstrated in tests with r/a source and X-rays.
