view article
Figure 2
Schematic representation of the lens and its local thickness. The functions xL(y, z), xR(y, z) describe the surface of the lens closer to the light source and the lens surface farther from the light source. For the parabolic biconcave lens xL(y,z) = max{ xC − (1/2R) (y2+z2) − (Wsm/2), xC-(W/2) }, xR(y, z) = min{xC + (1/2R)(y2+z2) + (Wsm/2), xC + (W/2)}, where R denotes the curvature radius of the lens, W is the maximum thickness of the lens and Wsm is the minimum thickness of the lens; xC is a position of the geometric center of the lens.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 2| March 2019| Pages 363-372
https://doi.org/10.1107/S1600577518017368
Follow J. Synchrotron Rad.
Sign up for e-alerts
E-alerts
Follow J. Synchrotron Rad. on Twitter
Twitter
Follow us on facebook
Facebook
Sign up for RSS feeds
RSS