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Figure 4
Possible optical arrangements for a `MAX IV type' MBA lattice, where the cone-shaped mirror is used in sagittal focusing [equation (5)[link]]. An almost free-aberrated optical solution can be obtained by focusing the beam at 2.5 m from the source with mirror grazing angles of 2.47°. This optical configuration allows having the two mirrors facing each other and almost parallel to the dipole chamber, while limiting impedance instabilities. Equations (1)[link], (2)[link], (3)[link] and (5)[link] give the best position and radius of the two mirrors: p = 650 mm and R = 22.322 m for the cylindrical mirror, and for the cone-shaped mirror p = 1250 mm and r(x) = r0(1 + ax) with r0 = 53.87 mm and a = −2.21 × 10−5 mm−1. Due to the small mirror grazing angle, the conical term `a' is negligible.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 24| Part 2| March 2017| Pages 386-391
https://doi.org/10.1107/S1600577516020518
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