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

# The `Focalisation` Instrument

Test instrument for neutron focalisation with a set of supermirrors. No guide / velocity selector One parabolic SM converges the incoming beam to its focal point, then one elliptic SM (with primary focal point at same location as parabolic SM focal point) images the focal point onto the detector.

## Identification

- Site: LLB
- Author: Sylvain Desert
- Origin: LLB
- Date: 2007.
- Version: 1.4

## Description

    Test instrument for the MirrorElli and MirrorPara components

    Example: mcrun Focalisation.instr Qmin=0.0001 G=1 H=.0001 F=.00066 DET=8.2 lambda=14 divergence=.1 BeamWidth=.05 TetaMin=3

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
--- | --- | --- | ---
Qmin | AA^-1 | Minimum momentum transfer on the detector | .0001
G | 1 | Ratio of the mirror focal length = increase in accepted divergence angle | 1
H | m | Height of mirrors | .0001
F | m | Parabolic focal | .00066
DET | m | Distance between the two elliptic focal points | 8.2
lambda | AA | Mean wavelength of neutrons | 14
divergence | deg | source divergence | .1
BeamWidth | m | Length of the source to focalize | .05
TetaMin | deg | Minimum angle that must be reflected by the device assuming m=3 SM (TetaMin=3 for 5A and above neutron) | 3

## Links

- Source code for `Focalisation.instr`.

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