[ Identification | Description | Input parameters | Links ]

The Reflectometer Instrument

Horizontal reflectometer, multi-angle of incidence

Identification

• Site: Templates
• Author: Anette Vickery, contact: anette.vickery@fys.ku.dk
• Origin: KU
• Date: November 2011

Description

A horizontal reflectometer. The instrument is built of a 2.5 m long mirror and an inclined elliptical guide. The grazing angle is defined by a set of
slits. The sample size is 4cm x 4cm (horizontal sample).
The role of the mirror is to provide an angle of incidence of up to 4 deg and at the same time avoid a direct line of sight to the source.
The reflectivity is the ratio between the direct beam reflected beam intensities. Therefore two simulations are needed to get the reflectivity curve:

Example: mcrun Reflectometer.instr -n1e10 directbeam=1,thetasample=0.4,Qmin=0,Qmax=0.15 -d directbeam
Example: mcrun Reflectometer.instr -n1e10 directbeam=0,thetasample=0.4,Qmin=0,Qmax=0.15 -d reflectedbeam

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
directbeam		If 1, the sample is a mirror with reflectivity 1. If 0, the mirror reflects like a D2O surface with zero roughness	1
Lam_min	AA	Minimum wavelength emitted by the cold moderator	2.0
Lam_max	AA	Maximum wavelength emitted by the cold moderator	10
deltatheta	%	The angular resolution	2
theta_sample	deg	The grazing angle	1
defineAngle		If 0, the angle defining slits are wide open. If 1 the angular resolution is deltatheta	1
Qmin	AA^-1	The minimum value of the interesting Qrange	0
Qmax	AA^-1	The maximum value of the interesting Qrange	0.5
straight		If 1, the guide walls are straight	1
width	m	The width of the guide in the case of straight guide walls	0.05

Links

• Source code for Reflectometer.instr.

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[ Identification | Description | Input parameters | Links ]

Generated on 2025-05-08 13:31:31

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Last Modified: Monday, 30-Jun-2025 11:05:10 CEST