[ Identification | Description | Input parameters | Links ]

# The `Pol_guide_mirror` Component

Polarising guide with a supermirror along its diagonal.

## Identification

- Site:
- Author: Erik B Knudsen
- Origin: DTU Physics
- Date: July 2018

## Description

##

##

    Based on Pol_guide_vmirror by P. Christiansen.
    Models a rectangular guide with entrance centered on the Z axis and
    with one supermirror sitting on the diagonal inside.
    The entrance lies in the X-Y plane.  Draws a true depiction
    of the guide with mirror and trajectories.
    The polarisation is handled similar to in Monochromator_pol.
    The reflec functions are handled similar to Pol_mirror.
    The up direction is hardcoded to be along the y-axis (0, 1, 0)

    Note that this component can also be used as a frame overlap-mirror
    if the up and down reflectivities are set equal. In this case the wall
    reflectivity (rPar) should probably be set to 0.

    Reflectivity values can either come from datafiles or from
    sets of parameters to the standard analytic reflectivity function commonly
    used for neutron guides:
    R=R0; q<qc, R=(1-tanh((q-m qc)/W))(1-alpha(q-qc)).
    If a filename is specified for e.g. rData
    the datafile table overrides the analytic function.

    GRAVITY: YES

    %BUGS
    No absorption by mirror.
    The reflectivity parameters must be given as literal constants. Using variables
    will result in undefined behaviour.
    </PRE>

    Input parameters
    Parameters in boldface are required;
    the others are optional.

     NameUnitDescriptionDefault

     rUpPar1Mirror Parameters for spin up standard reflectivity function{1.0, 0.0219, 4.07, 3.2, 0.003}
     rDownPar1Mirror Parameters for spin down standard reflectivity function{1.0, 0.0219, 4.07, 3.2, 0.003}
     rPar1Guide Parameters for standard reflectivity function{1.0, 0.0219, 4.07, 3.2, 0.003}
     rDatastrGuide Reflectivity data file""
     rUpDatastrMirror Reflectivity data file for spin up""
     rDownDatastrMirror Reflectivity data file for spin down""
     xwidthmWidth at the guide entry
     yheightmHeight at the guide entry
     lengthmlength of guide

      AT (
      ,
      ,

      ) RELATIVE

      ROTATED (
      ,
      ,

      ) RELATIVE

    Links

       Source code for Pol_guide_mirror.comp.

     [ Identification
     | Description
     | Input parameters
     | Links ]