[ Identification | Description | Input parameters | Output parameters | Links ]

The Guide_wavy Component

Neutron guide with gaussian waviness.

Identification

• Author: Kim Lefmann
• Origin: Risoe
• Date:(Unknown)
• Version: 1.12

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.

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

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

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
h2	m	Height at the guide exit
l	m	length of guide
R0	1	Low-angle reflectivity
Qc	AA-1	Critical scattering vector
alpha1	AA	Slope of reflectivity
m1	1	m-value of material, left
W1	AA-1	Width of supermirror cut-off
alpha2	AA	Slope of reflectivity
m2	1	m-value of material, right.
W2	AA-1	Width of supermirror cut-off
alpha3	AA	Slope of reflectivity
m3	1	m-value of material, top.
W3	AA-1	Width of supermirror cut-off
alpha4	AA	Slope of reflectivity
m4	1	m-value of material, bottom.
W4	AA-1	Width of supermirror cut-off
wavy_z	deg	Waviness in the z-(flight-)direction
wavy_xy	deg	Waviness in the transverse direction

Output parameters

Name	Unit	Description	Default
whalf
hhalf
lwhalf
lhhalf
norm_nv
norm_nh
f_h
f_v
eta_z
eta_xy

Links

• Source code for Guide_wavy.comp.

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[ Identification | Description | Input parameters | Output parameters | Links ]

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Sat Jul 31 08:37:33 2010

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Last Modified: Saturday, 31-Jul-2010 10:37:33 CEST