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The BDF/SHiP experiment requires precise monitoring of the beam dilution pattern on the high-power target absorbing up to 350kW (avg.). This paper presents the conceptual design of a dedicated Beam Dilution Monitor (BDM), which will enable observation of the circular beam sweep pattern during 400GeV/c proton operation. The proposed system is based on Secondary-Emission Monitor (SEM) grids comprising 12μm-thick titanium bands. Detailed simulations were performed to evaluate signal formation, thermal response, secondary-electron collection, and the detectability of dilution magnet failure scenarios. Different detector geometries and interlock strategies were also investigated, demonstrating that the proposed BDM concept can provide sufficiently fast and reliable detection of dilution failures.
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