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Figure 1
(a) A schematic of the display-type three-grid RFA employing the improved grid arrangement. (b) A schematic of the partial spherical shell with radially directed cylindrical holes used for the second grid, i.e. the retarding grid. (c) A photograph of the fabricated partial spherical shell with a holed area corresponding to an acceptance angle of ±52°. (d) A zoomed-in photograph of the holed area on the inner side of the spherical shell.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 5| September 2021| Pages 1669-1671
https://doi.org/10.1107/S1600577521007773
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