The `Guide` Component

Neutron guide.

Identification

Author: Kristian Nielsen
Origin: Risoe
Date: September 2 1998
Version: 1.31

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.

Example values: m=4 Qc=0.0219 W=1/300 alpha=6.49 R0=1

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	1	Low-angle reflectivity	0.99
Qc	AA-1	Critical scattering vector	0.0219
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

Output parameters

Name	Unit	Description	Default
pTable

The Guide Component

Identification

Description

Input parameters

Output parameters

Links

The `Guide` Component