ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A new class of focusing, condensing, and collimating devices for x rays, γ rays, and neutrons is described which is based on the use of microchannel plates (MCPs) or configurations of holes. As well as providing a simple collimating action due to the absorption of severely divergent rays in the channel walls, the microchannel-plate-type structures are capable of providing a focusing and collimating action arising from the reflection of near-grazing-incidence rays at the channel walls. The focusing action is in principle controllable by mechanical bending or slump forming of the channel plates or by appropriate shaping of the channel walls and is remarkably insensitive to source location, device alignment, and wavelength. Theoretical predictions for the performance of such devices are presented via both simple model calculations and Monte Carlo simulations. These suggest that some simple scaling relations hold between key parameters, and provide a guide to the optimum performance levels achievable with such devices for a wide range of geometries. Some experimental observations of the focusing action of MCPs for 0.071-nm x rays are presented. A wide variety of x-ray and neutron optical applications is possible.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1140312
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