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

The Channeled_guide component

Neutron guide with channels (bender section).

Identification

• Author: KN
• Origin: McStas release
• Date: 1999
• Version: 1.6

Description

Models a rectangular guide tube centered on the Z axis. The entrance lies
in the X-Y plane.
The guide may be tapered, and may have vertical subdivisions (used for
bender devices).

Example values: mx=4 my=2 Qcx=Qcy=0.02 W=1/300 alphax=alphay=6.49 R0=1

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
d	m	Thickness of subdividing walls
k	1	Number of channels in the guide (>= 1)
l	m	Length of guide
R0	1	Low-angle reflectivity
Qcx	AA-1	Critical scattering vector for left and right vertical mirrors in each channel
Qcy	AA-1	Critical scattering vector for top and bottom mirrors
alphax	AA	Slope of reflectivity for left and right vertical mirrors in each channel
alphay	AA	Slope of reflectivity for top and bottom mirrors
mx	1	m-value of material for left and right vertical mirrors in each channel. Zero means completely absorbing.
my	1	m-value of material for top and bottom mirrors. Zero means completely absorbing.
W	AA-1	Width of supermirror cut-off for all mirrors

Output parameters

Name	Unit	Description	Default
w1c
w2c
ww
hh
whalf
hhalf
lwhalf
lhhalf

Links

• Source code for Channeled_guide.comp.

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

Generated automatically by McDoc, Kristian Nielsen <kristian.nielsen@risoe.dk> / Jan 22 2001

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Last Modified: Tuesday, 22-Jun-2004 14:04:09 CEST