[ 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

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


 
Name
Unit
Description
Default


 
rUpPar
1
Mirror Parameters for spin up standard reflectivity function
{1.0, 0.0219, 4.07, 3.2, 0.003}

 
rDownPar
1
Mirror Parameters for spin down standard reflectivity function
{1.0, 0.0219, 4.07, 3.2, 0.003}

 
rPar
1
Guide Parameters for standard reflectivity function
{1.0, 0.0219, 4.07, 3.2, 0.003}

 
rData
str
Guide Reflectivity data file
""

 
rUpData
str
Mirror Reflectivity data file for spin up
""

 
rDownData
str
Mirror Reflectivity data file for spin down
""

 
xwidth
m
Width at the guide entry

 
yheight
m
Height at the guide entry

 
length
m
length of guide




  

  
AT (
  
, 
  
, 
  

  
) RELATIVE
  

  

    Generate
  
  
  

  
ROTATED (
  
, 
  
, 
  

  
) RELATIVE
  



Links


  
 Source code for Pol_guide_mirror.comp.
  



 [ Identification
 | Description
 | Input parameters
 | Links ]



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 Last Modified: Monday, 30-Jun-2025 11:05:09 CEST