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14.16 The MM_c McXtrace Component
Single Pore as part of the Silicon Pore Optics (SPO) as envisioned for the ATHENA+ space telescope.
Identification
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Author: Erik B Knudsen and Desiree D. M. Ferreira
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Origin: DTU Physics, DTU Space
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Date: Feb. 2016, Feb. 2017
Description
A single pore is simulated, which may have thick walls. The top and bottom are curved cylindrically azimuthally, and according to the Wolter I optic lengthwise (sagitally). A parameter specifies whether this is hyperbolic or parabolic. The azimuthal curvature is defined by the parameter radius. This refers to the center of the pore. I.e the top and bottom plates have radius of curvature <radius+yheight/2> and <radius-yheight/2> respectively.
To intersect the Wolter I plates we take advatage of the azimuthal symmetry and only consider the radial component of the photon’s wavevector.
Input parameters
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
|
|||
|
pore_th |
m |
Thickness of the pore walls (plates) |
|
|
pore_width |
m |
Width of a single pore |
|
|
ring_nr |
1 |
Ring number; selects the data block read from size_file |
|
|
radius_m |
m |
Ring radius of the upper (reflecting) plate of the pore at the optic centre. |
|
|
Z0 |
m |
Distance between optics centre plane and focal spot (essentially focal length). |
|
|
xwidth |
m |
Width of the pore. |
|
|
pore_height |
m |
Height of the pore |
|
|
gap |
m |
Gap between the plate and the intersection plane with the hyperbolic section. (currently ignored) |
0 |
|
chamfer_width |
m |
Width of side walls. |
0 |
|
length |
m |
Length along the optical axis |
0 |
|
mirror_reflec |
|
Data file containing reflectivities of the reflector surface (TOP). |
”” |
|
bottom_reflec |
|
Data file containing reflectivities of the bottom surface (BOTTOM). |
”” |
|
side_reflec |
|
Data file containing reflectivities of the side walls (LEFT and RIGHT). |
”” |
|
size_file |
str |
Table file with the per-ring geometry, read with block number ring_nr |
”” |
|
non_specular_file |
str |
Data file describing non-specular reflectivity |
”” |
|
R_d |
|
Default reflectivity value to use if no reflectivity file is given. Useful f.i. is one surface is reflecting and the others absorbing. |
1 |
|
primary |
|
If non-zero, the pore is considered a primary reflector, and extends towards negative z. I.e. the entry plane is behind the z=0-plane. If zero, the pore is considered secondary and extends from the z=0-plane and towards positive z. |
1 |
|
dalpha |
deg |
Offset to the alpha angle computed from the focal length. Useful for targeting the modified conical geometry (currently ignored). |
0 |
|
waviness |
rad |
Waviness of the reflecting surface. The slope error is assumed to be uniformly distributed in the interval [-waviness:waviness]. |
0 |
|
longw |
|
If non-zero, waviness is 1D and along the pore axis. |
0 |
|
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Links
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Component source code found in file MM_c.comp.
