A magnet with a spin-flip foil inside
Author: Erik B Knudsen
Origin: DTU Physics
Date: Sep. 2015
ESCRIPTION A magnet with a spin-flip foil inside
This component models a magnet with a constant magnetic field and a slanted magnetized foil inside acting as a spin-flipper. This arrangement may be used to target the geometry of a Spin-Echo SANS instrument (Rekveldt, NIMB, 1997 || Rekveldt, Rev Sci Instr. 2005). In its most basic form a SE-SANS instrument nrelies on inclined field regions of constant magnetic field, which can be difficult to realize. Instead it is possible to emulate such regions using a magnetized foil.
In this component th emagntzied foil is modelled as a canted (by the angle phi) mathematical plane inside a region of constant magnetic field of dimensions (xwidth,yheight,zdepth). Furthermore, exponetially decaying stray fields from the constant field region may be specified by giving parameters (Bxwidth,Byheight,Bzdepth) > (xwidth,yheight,zdepth).
Parameters in boldface are required; the others are optional.
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Name |
Unit |
Description |
Default |
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stray_field |
|
Toggle for modelling of stray fields. |
1 |
|
xwidth |
m |
width of the magnet |
|
|
yheight |
m |
height of the magnet |
|
|
zdepth |
m |
thickness of the magnet |
|
|
Bxwidth |
m |
width of the B-field of thev component |
-1 |
|
Byheight |
m |
height of the B-field of the component |
-1 |
|
Bzdepth |
m |
thickness of the B-field of the component |
-1 |
|
phi |
rd |
angle (from the xz-plane) of the foil-spinflipper inside the magnet |
0.0 |
|
foilthick |
um |
Thickness of the magnetized foil |
0.0 |
|
Bx |
T |
Parameter used for x composant of field. |
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By |
T |
Parameter used for y composant of field. |
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Bz |
T |
Parameter used for z composant of field. |
|
|
foil_in |
|
Toggle for optional foil in the flipper. |
1 |
|
verbose |
|
Toggle verbose mode |
0 |
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Component source code found in file Foil_flipper_magnet.comp.