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

# The `Guide_channeled` Component

Neutron guide with channels (bender section).

## Identification

- Author: Kristian Nielsen
- Origin: Risoe
- Date: 1999
- Version: 1.13

## 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: Guide_channeled(w1=0.1, h1=0.1, w2=0.1, h2=0.1, l=2.0,
     R0=0.99, Qcx=0.0219, Qcy=0.0219, alphax=6.07, alphay=6.07, W=0.003, k=1,
    d=0.0005, mx=1, my=1)

    %BUGS
    This component does not work with gravitation on. Use Guide_gravity.
    This component does not work in multichannel focusing geometry.

    Example values: mx=4 my=2 Qcx=Qcy=0.0219 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 |
l | m | Length of guide |
R0 | 1 | Low-angle reflectivity | 0.99
Qcx | AA-1 | Critical scattering vector for left and right vertical mirrors in each channel | 0.021
Qcy | AA-1 | Critical scattering vector for top and bottom mirrors | 0.021
alphax | AA | Slope of reflectivity for left and right vertical mirrors in each channel | 6.07
alphay | AA | Slope of reflectivity for top and bottom mirrors | 6.07
W | AA-1 | Width of supermirror cut-off for all mirrors | 0.003
k | 1 | Number of channels in the guide (>= 1) | 1
d | m | Thickness of subdividing walls | 0.0005
mx | 1 | m-value of material for left and right vertical mirrors in each channel. Zero means completely absorbing. | 1
my | 1 | m-value of material for top and bottom mirrors. Zero means completely absorbing. | 1

## Output parameters

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

## Links

- Source code for `Guide_channeled.comp`.

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