Single Pore as part of the Silicon Pore Optics (SPO) as envisioned for the ATHENA+ space telescope.
Identification
Site:
Author: Erik B Knudsen and Desiree D. M. Ferreira
Origin: DTU Physics, DTU Space
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 and 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
pore_width
ring_nr
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
gap
m
Gap between the plate and the intersection plane with the hyperbolic section. (currently ignored)
0
chamfer_width
0
length
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
""
non_specular_file
""
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.