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14.23 The Conics_PP McStas Component
Release: McStas 2.7 Date: September 2021
Parabolid-Parabolid shells for Wolter optic
Identification
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Author: Peter Wilendrup and Erik Knudsen <br>(derived from Giacomo Resta skeleton-component)
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Origin: DTU
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Date: September 2021
Description
Implements a set of nshells Wolter I Paraboloid/Parabolid pairs using conics.h from ConicTracer.
The component has two distinct modes of specifying the geometry: a) Via the radii vector, parametrized from largest to smallest radius with a length of ’nshells’
b) By specifying radii rmax and rmin, between which a quadratic law distributes ’nshells’ surfaces.
The mirrors are assumed to be touching at the mid-optic plane, i.e. there is no gap between primary and secondary mirror. By definition the ratio between primary and secondary mirror glancing angles is 1/3. At present a single m-value is used for all mirrors.
Input parameters
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
|
|||
|
rmin |
m |
Midoptic plane radius of innermost mirror pair. |
0.0031416 |
|
rmax |
m |
Midoptic plane radius of outermost mirror pair. |
0.05236 |
|
focal_length_u |
m |
Focal length of upstream mirror. |
10.070 |
|
focal_length_d |
m |
Focal length of downstream mirror. |
10.070 |
|
lp1 |
m |
Upstream paraboloid mirror length. |
0.84 |
|
lp2 |
m |
Downstream paraboloid mirror length. |
0.84 |
|
nshells |
1 |
Number of nested shells to expect |
4 |
|
m |
1 |
Critical angle of mirrors as multiples of Ni. |
1 |
|
mirr_thick |
m |
Thickness of mirror shell surfaces - NOT YET IMPLEMENTED |
0 |
|
disk |
|
Flag. If nonzero, insert a disk to block the central area within the innermost mirror. |
1 |
|
radii |
m |
Optional vector of radii (length should match nshells) |
NULL |
|
R0 |
1 |
Reflectivity at Low angles for reflectivity curve approximation |
0.99 |
|
Qc |
Å\(^{-1}\) |
Critical scattering vector |
0.021 |
|
W |
Å\(^{-1}\) |
Width of supermirror cut-off |
0.003 |
|
alpha |
Å |
Slope of reflectivity for reflectivity curve approximation |
6.07 |
|
transmit |
1 |
Fraction of statistics to assign to transmitted beam - NOT YET IMPLEMENTED |
0 |
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Links
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Component source code found in file Conics_PP.comp.
