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

# The `PreMonitor_nD` Component

Neutron parameters cross-correlation monitor.

## Identification

- Author: Emmanuel Farhi
- Origin: ILL (France)
- Date: 01st Feb 2001.
- Version: 1.9

## Description

    Neutron parameters are stored when entering in the PreMonitor.
    If this neutron then reaches the associated Monitor_nD, this latter
    component measures the previously stored parameters. This enables to study
    correlations between a given parameter in one place of the instrument
    and an other position in the instrument.

    EXAMPLES:
    Here follows a Phase-Space correlation diagram detector
    (used for guides for instance)

     MyPreMonitor = PreMonitor_nD(
      comp = MyMonitor)

    (... for instance a Guide ...)

    MyMonitor = Monitor_nD(
      xmin = -0.1, xmax = 0.1,
      ymin = -0.1, ymax = 0.1,
      options = "hdiv x, auto, use premonitor");

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
--- | --- | --- | ---
comp | no quotes | name of the associated Monitor_nD where the detection should take place |

## Links

- Source code for `PreMonitor_nD.comp`.
- McStas at ILL
- Monitor_nD

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