The Mirror_Parabolic McStas Component

Parabolic mirror.

Models a parabolic mirror. The reﬂectivity proﬁle is given by a 2-column reﬂectivity free text ﬁle with format [q(Å-1) R(0-1)].

Example: Mirror_Parabolic(reﬂect="supermirror_m3.rﬂ", xwidth = 0.05, xshift=0.05, yheight = 2e-4, focus = 6.6e-4)

Parameters in boldface are required; the others are optional.


Name	Unit	Description	Default



reﬂect	q(Å\(^{-1}\) R(0-1)	(str) Reﬂectivity ﬁle name. Format	0
xwidth	m	width of the illuminated parabola	0.05
xshift	m	distance between the beam centre and the symetric axis of the parabolla	0.019
yheight	m	height of the mirror	2e-4
focus	m	focal length	6.6e-4
R0	1	Low-angle reﬂectivity	0.99
Qc	Å\(^{-1}\)	Critical scattering vector	0.0219
alpha	Å	Slope of reﬂectivity	6.07
m	1	m-value of material. Zero means completely absorbing.	1.0
W	Å\(^{-1}\)	Width of supermirror cut-oﬀ	0.003