The `Guide_m` Component

Neutron guide.

Identification

Site:
Author: Kristian Nielsen
Origin: Risoe
Date: September 2 1998, Modified 2013

Description

Models a rectangular guide tube centered on the Z axis. The entrance lies
in the X-Y plane.
For details on the geometry calculation see the description in the McStas
reference manual.
The reflectivity profile may either use an analytical mode (see Component
Manual) or a 2-columns reflectivity free text file with format
[q(Angs-1) R(0-1)].

Example: Guide(w1=0.1, h1=0.1, w2=0.1, h2=0.1, l=2.0,
R0=0.99, Qc=0.021, alpha=6.07, m=2, W=0.003

%VALIDATION
May 2005: extensive internal test, no bugs found
Validated by: K. Lieutenant

%BUGS
This component does not work with gravitation on. Use component Guide_gravity then.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
reflect	str	Reflectivity file name. Format [q(Angs-1) R(0-1)]	0
w1	m	Width at the guide entry
h1	m	Height at the guide entry
w2	m	Width at the guide exit
h2	m	Height at the guide exit
l	m	Length of guide
R0_left	1	Low-angle reflectivity, left mirrror.	0.99
R0_right	1	Low-angle reflectivity, right mirror.	0.99
R0_top	1	Low-angle reflectivity, top mirror.	0.99
R0_bottom	1	Low-angle reflectivity, bottom mirror.	0.99
Qc_left	AA-1	Critical scattering vector, left mirrror.	0.0219
Qc_right	AA-1	Critical scattering vector, right mirror.	0.0219
Qc_top	AA-1	Critical scattering vector, top mirror.	0.0219
Qc_bottom	AA-1	Critical scattering vector, bottom mirror.	0.0219
alpha_left	AA	Slope of reflectivity, left mirrror.	6.07
alpha_right	AA	Slope of reflectivity, right mirror.	6.07
alpha_top	AA	Slope of reflectivity, top mirror.	6.07
alpha_bottom	AA	Slope of reflectivity, bottom mirror.	6.07
m_left	1	m-value of material. Zero means completely absorbing, left mirrror.	2
m_right	1	m-value of material. Zero means completely absorbing, right mirror.	2
m_top	1	m-value of material. Zero means completely absorbing, top mirror.	2
m_bottom	1	m-value of material. Zero means completely absorbing, bottom mirror.	2
W_left	AA-1	Width of supermirror cut-off, left mirrror.	0.003
W_right	AA-1	Width of supermirror cut-off, right mirror.	0.003
W_top	AA-1	Width of supermirror cut-off, top mirror.	0.003
W_bottom	AA-1	Width of supermirror cut-off, bottom mirror.	0.003

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

The Guide_m Component

Identification

Description

Input parameters

Links

The `Guide_m` Component