NASU/INR, Kiev, Ukraine
Features of Metal Microstrip Detectors (MMD) are presented for application in beam profile monitoring of charged particles and synchrotron radiation beams. Through an innovative plasma-chemistry etching production process*, thin metal micro-strips only 1-2μm thick are aligned. Because of the very thin nature of the strips, the MMD is nearly transparent, and can be used in-situ for measuring, tuning and imaging the beam online. Metal structure of sensors guaranties high radiation tolerance (about 100MGy) providing their stable response to the beam particles (by the secondary electron emission) independent upon the accumulated fluence. The spatial resolution of the MMD is determined by the strips pitch constituting from 5 to 100µm in currently manufactured samples*. The data were obtained with MMDs read out by the low noise X-DAS system** providing integration time from 1 to 500ms, and the ability to process signals in real time. The scope of MMD & X-DAS is scientific and applied research using beams: in control systems of accelerators and synchrotron radiation sources. New possibilities are discussed for equipment requiring high spatial resolution and radiation hardness.
* V.M. Pugatch et al. Plasma technologies for manufacturing micro-strip metal detectors for ionizing radiation. Series «Plasma Physics» (13). 2007, № 1, p. 173-175.
** sens-tech.com
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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.
