[ Identification | Description | Input parameters | Links ]

The Pol_guide_vmirror Component

Polarising guide with nvs x 2 supermirrors sitting in v-shapes inside, upgraded from original single V-cavity.

Identification

• Site:
• Author: Peter Willendrup
• Origin: DTU
• Date: June 2022

Description

Models a rectangular guide with entrance centered on the Z axis and
with nvs x two supermirrors sitting in v-shapes inside.
The entrance lies in the X-Y plane.  Draws a true depiction
of the guide with mirrors, 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)

The reflectivity parameters can be
1. double pointer initializations with 5 parameters (e.g. {R0, Qc, alpha, m, W} AND inputType=0), or
2. double pointer initializations with 6 parameters (e.g. {R0, Qc, alpha, m, W, beta} AND inputType=0), or
3. table names (e.g."supermirror_m2.rfl" AND inputType=1), or
4. individually assigned values (e.g. rR0=1.0, rQc=0.0217, ... etc AND inputType=2).
NB! This might cause warnings by the compiler that can be ignored.
Note that the reflectivity functions that use with values and those that use tables are different.

GRAVITY: YES

%BUGS
No absorption by mirror.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
nvs	1	Number of V-cavities across width of guide	1
xwidth	m	Width at the guide entry	0.1
yheight	m	Height at the guide entry	0.1
length	m	length of guide	0.5
rR0	1	Cavity wall reflectivity below critical scattering vector, use with inputType = 2	1.0
rQc	AA-1	Cavity wall reflectivity critical scattering vector, use natural Ni (m=1 definition) value of 0.0217, use with inputType = 2	0.0217
ralpha	AA	Cavity wall slope of reflectivity, use with inputType = 2	6.5
rmSM	1	Cavity wall m-value of material. Zero means completely absorbing. Use with inputType = 2	2
rW	AA-1	Cavity wall width of reflectivity cut-off, use with inputType = 2	0.00157
rbeta	AA2	Cavity wall curvature of reflectivity, use with inputType = 2	80
rUpR0	1	Mirror spin up reflectivity below critical scattering vector, use with inputType = 2	1.0
rUpQc	AA-1	Mirror spin up reflectivity critical scattering vector, use natural Ni (m=1 definition) value of 0.0217, use with inputType = 2	0.0217
rUpalpha	AA	Mirror spin up slope of reflectivity, use with inputType = 2	2.47
rUpmSM	1	Mirror spin up m-value of material. Zero means completely absorbing. Use with inputType = 2	4
rUpW	AA-1	Mirror spin up width of reflectivity cut-off, use with inputType = 2	0.0014
rUpbeta	AA2	Mirror spin up curvature of reflectivity, use with inputType = 2	0
rDownR0	1	Mirror spin down reflectivity below critical scattering vector, use with inputType = 2	1.0
rDownQc	AA-1	Mirror spin down reflectivity critical scattering vector, use natural Ni (m=1 definition) value of 0.0217, use with inputType = 2	0.0217
rDownalpha	AA	Mirror spin down slope of reflectivity, use with inputType = 2	1
rDownmSM	1	Mirror spin down m-value of material. Zero means completely absorbing. Use with inputType = 2	0.65
rDownW	AA-1	Mirror spin down width of reflectivity cut-off, use with inputType = 2	0.003
rDownbeta	AA2	Mirror spin down curvature of reflectivity, use with inputType = 2	0
debug	1	if debug > 0 print out some internal runtime parameters	0
allow_inside_start			0
rPar	1	Cavity wall parameters array for rFunc, use with inputType = 0	{1.0, 0.0217, 6.5, 2, 0.00157, 80}
rUpPar	1	Mirror Parameters array for rUpFunc, use with inputType = 0	{1.0, 0.0217, 2.47, 4, 0.0014}
rDownPar	1	Mirror Parameters for rDownFunc, use with inputType = 0	{1.0, 0.0217, 1, 0.65, 0.003}

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

Links

• Source code for Pol_guide_vmirror.comp.

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[ Identification | Description | Input parameters | Links ]

Generated on 2023-09-19 20:01:36

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Last Modified: Tuesday, 17-Sep-2024 05:31:14 CEST