[ Identification | Description | Input parameters | Links ]

# The `ISIS_moderator` Component

ISIS Moderators

## Identification

- Site:
- Author: S. Ansell and D. Champion
- Origin: ISIS
- Date: AUGUST 2005

## Description

    Produces a TS1 or TS2 ISIS moderator distribution.  The Face argument determines which moderator
    is to be sampled. Each face uses a different Etable file (the location of which is determined by
    the MCTABLES environment variable).  Neutrons are created having a range of energies
    determined by the Emin and Emax arguments.  Trajectories are produced such that they pass
    through the moderator face (defined by modXsixe and yheight) and a focusing rectangle
    (defined by xh,focus_yh and dist).  Please download the documentation for precise instructions for use.

    Example:   ISIS_moderator(Face ="water", Emin = 49.0,Emax = 51.0, dist = 1.0, focus_xw = 0.01,
    focus_yh = 0.01, xwidth = 0.074, yheight = 0.074, CAngle = 0.0,SAC= 1)

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default |
Face | word | Name of the face - TS2=groove,hydrogen,narrow,broad - | "hydrogen" |
Emin | meV | Lower edge of energy distribution | 49.0 |
Emax | meV | Upper edge of energy distribution | 51.0 |
dist | m | Distance from source to the focusing rectangle | 1.0 |
focus_xw | m | Width of focusing rectangle | 0.01 |
focus_yh | m | Height of focusing rectangle | 0.01 |
xwidth | m | Moderator vertical size | 0.074 |
yheight | m | Moderator Horizontal size | 0.074 |
CAngle | radians | Angle from the centre line | 0.0 |
SAC | boolean | Apply solid angle correction or not (1/0) | 1 |
Lmin | meV | Lower edge of wavelength distribution | 0 |
Lmax | meV | Upper edge of wavelength distribution | 0 |
target_index | 1 | relative index of component to focus at, e.g. next is +1 | +1 |
verbose | boolean | Echo status information at everu 1e5'th neutron | 0 |

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

## Links

- Source code for `ISIS_moderator.comp`.
- Further information should be
- downloaded from the ISIS MC website.
- *******************************************************************************/

[ Identification | Description | Input parameters | Links ]