The `Mirror_conic` Component

Single flat mirror plate using the conic.h reflection routines (test component)

Identification

Author: Peter Willendrup
Origin: DTU
Date: October 2026

Description

Test component for the reflection routines in conic.h (ConicTracer), which are
used by e.g. Conics_*, FlatEllipse_finite_mirror and NMO. It models a single
flat mirror so that the results can be compared directly with Mirror.comp.

The mirror lies in the local y-z plane at x=0, extending from z=0 to z=length
and from y=-yheight/2 to y=yheight/2. Only neutrons arriving from the x<0 side
(vx>0) interact; everything else passes unaffected. Each neutron interacts at
most once.

conic=0: the mirror is a conic.h FlatSurf and is handled by reflectNeutronFlat(),
which reflects with probability R and otherwise transmits the neutron
unaffected. Compare with Mirror(transmit=1).
conic=1: the mirror is a conic.h ConicSurf cylinder of (very large) radius 1 km,
handled by reflectNeutronConic(), which always reflects and weights by R.
Compare with Mirror(transmit=0). A Gaussian figure (slope) error can be
applied via sigma_m and sigma_s; the default is 0 here, whereas the
Conics_* components default to the conic.h values of 1 and 250 urad.

Example: Mirror_conic(length=1, yheight=0.1, m=2)

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
length	m	Length of the mirror along z	1
yheight	m	Height of the mirror along y	0.1
R0	1	Low-angle reflectivity	0.99
Qc	AA^-1	Critical scattering vector	0.021
alpha	AA	Slope of reflectivity	6.07
m	1	m-value of material	2
W	AA^-1	Width of supermirror cut-off	0.003
conic	1	0: use FlatSurf/reflectNeutronFlat(), 1: use ConicSurf/reflectNeutronConic()	0
sigma_m	rad	RMS meridional slope (figure) error, conic=1 only; for grazing angles below 10*sigma_m the waviness model of Hansen et al., arXiv:1612.03763 is used	0
sigma_s	rad	RMS sagittal slope (figure) error, conic=1 only	0

AT (	,	,		) RELATIVE
ROTATED (	,	,		) RELATIVE

The Mirror_conic Component

Identification

Description

Input parameters

Links

The `Mirror_conic` Component