[ Identification | Description | Input parameters | Links ]

The Guide_wavy Component

Neutron guide with gaussian waviness.

Identification

• Site:
• Author: Kim Lefmann
• Origin: Risoe
• Date:

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.

Example: m=2 Qc=0.0218 (nat. Ni) W=1/300 alpha=4.38 R0=0.995 (given by Daniel Clemens, PSI)

%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	0.995
Qc	AA-1	Critical scattering vector	0.0218
alpha	AA	Slope of reflectivity	0
m	1	m-value of material. Zero means completely absorbing.	0
W	AA-1	Width of supermirror cut-off for all mirrors	0
alpha1	AA	Slope of reflectivity left	4.38
m1	1	m-value of material, left	2
W1	AA-1	Width of supermirror cut-off left	0.003
alpha2	AA	Slope of reflectivity right	4.38
m2	1	m-value of material, right.	2
W2	AA-1	Width of supermirror cut-off right	0.003
alpha3	AA	Slope of reflectivity top	4.38
m3	1	m-value of material, top.	2
W3	AA-1	Width of supermirror cut-off top	0.003
alpha4	AA	Slope of reflectivity bottom	4.38
m4	1	m-value of material, bottom.	2
W4	AA-1	Width of supermirror cut-off bottom	0.003
wavy_z	deg	Waviness in the z-(flight-)direction	0
wavy_xy	deg	Waviness in the transverse direction	0

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

Links

• Source code for Guide_wavy.comp.

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[ Identification | Description | Input parameters | Links ]

Generated on mcstas 3.5.32

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Last Modified: Monday, 30-Jun-2025 11:05:09 CEST