[ Identification | Description | Input parameters | Links ]

The Guide_simple Component

Neutron guide.

Identification

• Site:
• Author: Kristian Nielsen
• Origin: Risoe
• Date: September 2 1998

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
w1	m	Width at the guide entry
h1	m	Height at the guide entry
w2	m	Width at the guide exit	0
h2	m	Height at the guide exit	0
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. glass/SiO2 Si Ni Ni58 supermirror Be Diamond m= 0.65 0.47 1 1.18 2-6 1.01 1.12	2
W	AA-1	Width of supermirror cut-off	0.003

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

Links

• Source code for Guide_simple.comp.

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[ Identification | Description | Input parameters | Links ]

Generated on 2024-01-03 11:47:43

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Last Modified: Tuesday, 17-Sep-2024 05:31:15 CEST