The `Foil_flipper_magnet2` Component

Identification

Site:
Author: Erik B Knudsen
Origin: DTU Physics
Date: Sep. 2015

Description

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).

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
field_function			const_magnetic_field
stray_field_function			NULL
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.
By	T	Parameter used for y composant of field.
Bz	T	Parameter used for z composant of field.
foil_in			1
verbose			0

AT (	,	,		) RELATIVE
ROTATED (	,	,		) RELATIVE

The Foil_flipper_magnet2 Component

Identification

Description

Input parameters

Links

The `Foil_flipper_magnet2` Component