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![[Figure 2]](kv5037fig2mag.jpg)
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Figure 2
Schematic of the capillary focusing with (a) parallel (direct) illumination, (b) FZP pre-focus beam in the first capillary focus with in-axis illumination, (c) FZP pre-focus beam at the position of the first focus of the capillary at a distance of 47.5 mm from the entrance with off-axis illumination, (d) FZP pre-focus beam inside the capillary with off-axis illumination. F1 and F2 are foci of the ellipsoidal capillary, a and b are the lengths of the semi-major and semi-minor ellipse axes, respectively, l is the capillary length, Δl is the footprint of the beam impinging on the surface of one side of the capillary (heavy weight curve), l1 is the distance from the FZP focus to the mid-position of the beam footprint on the capillary surface, l2 is the distance from the mid-position of the footprint of the beam to the capillary focus, and α is the capillary tilt angle around the first focal point F1. |
![[Figure 2]](kv5037fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
