[ Identification | Description | Examples | Input parameters | Links ]

The Test_Mirror_FlatEllipse Instrument

Compares a (nearly flat) FlatEllipse_finite_mirror with Mirror.comp

Identification

• Site: Tests_optics
• Author: Peter Willendrup
• Origin: DTU
• Date: October 2026

Description

A collimated, polychromatic beam hits a single mirror at grazing angle theta.
The mirror is either Mirror.comp with transmit=1, or a single-mirror
FlatEllipse_finite_mirror (conic.h, mirror_width=0) with foci at +/- focus,
which for the default focus=10 km is flat to within ~1e-10 rad over the mirror.
Reflected and transmitted beams are recorded separately as function of wavelength,
and the two COMP settings should give the same result.

COMP=0: Mirror, transmit=1
COMP=1: FlatEllipse_finite_mirror, nummirror=1, mirror_width=0

Examples

(Test cases in bold)

• Test: COMP=0 Detector: L_refl_I=8.98208e-07
• Test: COMP=1 Detector: L_refl_I=8.98208e-07
• Test: COMP=0 Detector: L_trans_I=7.01789e-07
• Test: COMP=1 Detector: L_trans_I=7.01789e-07

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
COMP	1	Mirror implementation, see description	0
theta	deg	Grazing angle of the beam on the mirror	1
length	m	Mirror length	1
m	1	Mirror m-value	2
R0	1	Low-angle reflectivity	0.99
Qc	AA^-1	Critical scattering vector	0.0217
alpha	AA	Slope of reflectivity	6.07
W	AA^-1	Width of supermirror cut-off	0.003
Lmin	AA	Minimum source wavelength	1
Lmax	AA	Maximum source wavelength	11
focus	m	Distance from the mirror centre to each of the ellipse foci	1e4
r0	m	Distance from the FlatEllipse_finite_mirror optical axis to the mirror	0.1

Links

• Source code for Test_Mirror_FlatEllipse.instr.

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[ Identification | Description | Examples | Input parameters | Links ]

Generated for mcstas 3.10.0

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Last Modified: Friday, 23-Oct-2026 18:32:10 CEST