McXtrace - An X-ray ray-trace simulation package

2.3  Components and Library

We here list the new and updated components (found in the McXtrace lib directory) which are detailed in the Component manual. For an overview see the Component Overview of the User Manual(This Document).

2.3.1  New components

Sources

We have revised the following source models to make them work as conherently as possible while retaining the backwards compatibility.

Source_pt

Point source.

Source_flat

Flat surface uniform source

Source_div

Flat surface uniform source with divergence distribution

Source_gaussian

Gaussian crossection source approximating a Bending Magnet

Furthermore we now also supply an experimental model of a bending magnet Bending_magnet. The following experimental components have been set up to facilitate interfacing with SPECTRA, Simplex, and GENESIS 1.3. In general they take the output of the relevant external program to get a phase space distribution of photons from which McXtrace samples rays to trace.

Source_genesis

Reads the output of a GENESIS 1.3 simulation. Useful for FEL-simulations.

Source_spectra

Reads the output of a SPECTRA simulation. Useful for Synchrotron simulations.

Source_simplex

Reads the output of a Simplex simulation. Useful for FEL simulations.

Samples

Single_crystal

Now has support for wavelength dependent absorption.

Molecule_2state

Also includes absorption support.

Molecule_2state

Option for supplying a q-parametrized scattering amplitude curve. This is for instance useful to add the effect of a well known solvent (e.g. Water) to a simulation.

SAXS

A whole set of SAXS-related samples is now available for various cases.

Optics

Filter

Now has the option of taking any shape (through an .off or .ply-file.

Filter

Added a refraction-option.

Multilayer_elliptic

Elliptical multilayer mirror. This component now has the option of using a analytical kinematical approximation to compute refleticity as opposed to supplying a datafile. This is faster, but often less accurate.

Lens_parab_*

The lenses now behave in a similar manner wrt. parameter naming etc., also fixes to an error in the absorption computation. Note that the lens version will be merged in the next release (see the component manual).

Mirror_elliptic

Elliptical shape mirror. Major geometry bug-fixes. Is scheduled to be merged with Mirror_curved.

Mirror_parabolic

Parabolic shape mirror. Major geometry bug-fixes. Is scheduled to be merged with Mirror_curved.

Mirror_curved

Cylindrical mirror. Fixed a bug which prevented its use as an azimuthal focusing mirror, with sideways incidence.

Chopper_simple

Optional random jitter was added.

Mask

A component that takes an image file as input, which is used to mask the beam. For instance to exmine linited resolution effects.

Monitors

TOF_monitor

New Intensity vs. time of flight monitor. Useful for sime-resolved studies with pulsed sources.

2.3.2  Example instruments

The following beamline models have been added (in addition to unit test models that test specific components):

• A rough model of the SPB beamline at the Euorpean XFEL.

• A model of the 711 powder diffraction beamline at Maxlab in Lund, Sweden.

• Model of the 811 surface diffraction and EXAFS beamline at Maxlab in Lund, Sweden.