About McStas
Conditions of use
Authors/Contacts
Project funding
Download
Components
Other Downloads (share)
Documentation
Wiki (GitHub)
McStas manual
Publications
14.21 The Conics_HE McStas Component
Release: McStas 2.7 Date: September 2021
Hyperbolic-Elliptic shells for Wolter optic
Identification
-
Author: Peter Wilendrup and Erik Knudsen <br>(derived from Giacomo Resta skeleton-component)
-
Origin: DTU
-
Date: September 2021
Description
Implements a set of nshells Wolter Ellipsoid/Hyperboloid 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 (upstream) of the mirror pairs. |
10 |
|
focal_length_d |
m |
Focal length (downstream) of the mirror pairs. |
10 |
|
le |
m |
Paraboloid mirror length. |
0.25 |
|
lh |
m |
Hyperboloid mirror length. |
0.25 |
|
nshells |
1 |
Number of nested shells to expect |
4 |
|
m |
1 |
Critical angle of mirrors as multiples of Ni_c. |
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 |
|
|
|||
|
|
|||
|
|
|||
Links
-
Component source code found in file Conics_HE.comp.
