The `Mirror` Component

Single mirror plate.

Identification

Site:
Author: Kristian Nielsen
Origin: Risoe
Date: August 1998

Description

Single mirror plate (used to build guides in compound components).
The component Mirror models a single rectangular neutron mirror plate.
It can be used as a sample component or to e.g. assemble a complete neutron
guide by putting multiple mirror components at appropriate locations and
orientations in the instrument definition, much like a real guide is build
from individual mirrors.
Additionally, it may be centered in order to be used as a sample or
monochromator plate, else it starts from AT position.
Reflectivity is either defined by an analytical model (see Component Manual)
or from a two-columns file with q [Angs-1] as first and R [0-1] as second.
In the local coordinate system, the mirror lies in the first quadrant of the
x-y plane, with one corner at (0, 0, 0). Plane is thus perpendicular to the
incoming beam, and should usually be rotated.

Example: Mirror(xwidth=.1, yheight=.1,R0=0.99,Qc=0.021,alpha=6.1,m=2,W=0.003)

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
reflect	str	Name of reflectivity file. Format q(Angs-1) R(0-1)	0
xwidth	m	width of mirror plate
yheight	m	height of mirror plate
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. Zero means completely absorbing.	2
W	AA-1	Width of supermirror cut-off	0.003
center	1	if true (1), the Mirror is centered arount AT position.	0
transmit	1	When true, non reflected neutrons are transmitted through the mirror, instead of being absorbed.	0

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

The Mirror Component

Identification

Description

Input parameters

Links

The `Mirror` Component