  A parabolic monocapillary X-ray lens (PMXRL) is designed to effectively
constrain a laboratory point X-ray source into a parallel beam. A square-shaped
lead occluder (SSLO) is used to block direct X-rays in the PMXRL. To design the
PMXRL, we use Python to simulate the conic parameter (p = 0.001 mm) of the lens
and then use a drawing machine to draw a corresponding lens (p = 0.000939 mm)
with a total length of 60.8 mm. We place the SSLO at the lens inlet for optical
testing. The results show that the controlled outgoing beam has a divergence of
less than 0.4 mrad in the range of 15-45 mm of the lens outlet, which achieves
excellent optical performance in X-ray imaging methodology. The design details
are reported in this paper.
