[ Identification | Description | Input parameters | Links ]

# The `Collimator_linear` Component

A simple analytical Soller collimator (with triangular transmission).

## Identification

- Site:
- Author: Kristian Nielsen
- Origin: Risoe
- Date: August 1998

## Description

    Soller collimator with rectangular opening and specified length. The
    transmission function is an average and does not utilize knowledge of the
    actual neutron trajectory. A zero divergence disables collimation (then the
    component works as a double slit).

    Example: Collimator_linear(xmin=-0.1, xmax=0.1, ymin=-0.1, ymax=0.1, length=0.25, divergence=40,transmission=0.7)

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default |
xmin | m | Lower x bound on slits | -0.02 |
xmax | m | Upper x bound on slits | 0.02 |
ymin | m | Lower y bound on slits | -0.05 |
ymax | m | Upper y bound on slits | 0.05 |
xwidth | m | Width of slits | 0 |
yheight | m | Height of slits | 0 |
length | m | Distance between input and output slits | 0.3 |
divergence | minutes of arc | Divergence horizontal angle (calculated as atan(d/length), where d is the blade spacing) | 40 |
transmission | 1 | Transmission of Soller (0<=t<=1) | 1 |
divergenceV | minutes of arc | Divergence vertical angle | 0 |

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

## Links

- Source code for `Collimator_linear.comp`.

[ Identification | Description | Input parameters | Links ]