[ Identification | Description | Input parameters | Links ]

# The `Guide_curved` Component

Non-focusing curved neutron guide.

## Identification

- Site:
- Author: Ross Stewart
- Origin: ILL (France).
- Date: November 18 2003

## Description

    Models a rectangular curved guide tube with entrance centered on the Z axis.
    The entrance lies in the X-Y plane.  Draws a true depiction
    of the guide, and trajectories.  Guide is not focusing.

    Example: Guide_curved(w1=0.1, h1=0.1, l=2.0, R0=0.99, Qc=0.021,
    alpha=6.07, m=2, W=0.003, curvature=2700)

    %BUGS
    This component does not work with gravitation on. Use component Guide_gravity then.
    Systematic error on transmitted flux is found to be about 10%.

## 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 |  |
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 | 4.38 |
m | 1 | m-value of material. Zero means completely absorbing. | 2 |
W | AA-1 | Width of supermirror cut-off | 0.003 |
curvature | m | Radius of curvature of the guide | 2700 |

AT ( | , | , |  | ) RELATIVE |  |
ROTATED ( | , | , |  | ) RELATIVE |

## Links

- Source code for `Guide_curved.comp`.
- Bender

[ Identification | Description | Input parameters | Links ]