Surface direct conversion of 511 keV gamma rays in large-area laminated multichannel-plate electron multipliers
نویسندگان
چکیده
We have used the TOPAS simulation framework to model direct conversion of 511 keV gamma rays electrons in a micro-channel plate (MCP) constructed from thin laminae heavy-metal-loaded dielectric such as lead-glass, patterned with micro-channels (LMCP). The serve converter ray primary electron within depth channel-forming surface that penetrates channel (‘surface conversion’). channels are coated secondary-emitting material produce multiplication channels. stacked on edge running top resulting ‘slab’ bottom; after assembly slab is metalized and bottom form finished LMCP. shape perimeter lamina determines dimensions at location slab, allowing non-uniform cross-sections thickness, width, length. also can be non-planar, curved surfaces both lateral dimensions. laminar construction allows incorporating structural elements LMCP for modular large-area arrays. internal shapes structure, texture, coatings optimized specific applications performance. across need not parallel either transverse direction. Surface an eliminates common two-step into optical photon scintillator followed by photodetector. simulations predict efficiency ⪆ 30% 2.54 cm-thick lead-glass elimination photocathode atmospheric pressure.
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ژورنال
عنوان ژورنال: Nuclear Instruments and Methods in Physics Research
سال: 2023
ISSN: ['1872-9576', '0168-9002']
DOI: https://doi.org/10.1016/j.nima.2023.168538