12.23  The NCrystal_process McStas Component

NCrystal_process component for the Union framework.

Identification

• Author: NCrystal developers, converted to a Union component by Mads Bertelsen

• Origin: NCrystal Developers (European Spallation Source ERIC and DTU Nutech)

• Date: 20.08.15

Description

This process uses the NCrystal library as a Union process, see user documentation for the NCrystal_sample.comp component for more information. The process only uses the physics, as the Union components has a separate geometry system. Absorption is also handled by Union, so any absorption output from NCrystal is ignored.

Part of the Union components, a set of components that work together and thus sperates geometry and physics within McStas. The use of this component requires other components to be used.

1) One specifies a number of processes using process components like this one 2) These are gathered into material definitions using Union_make_material 3) Geometries are placed using Union_box / Union_cylinder, assigned a material 4) A Union_master component placed after all of the above

Only in step 4 will any simulation happen, and per default all geometries defined before the master, but after the previous will be simulated here.

There is a dedicated manual available for the Union_components

Original header text for NCrystal_sample.comp: McStas sample component for the NCrystal scattering library. Find more information at the NCrystal wiki. In particular, browse the available datafiles at Data-library and read about format of the configuration string expected in the "cfg" parameter at Using-NCrystal.

<p/>NCrystal is available under the Apache 2.0 license. Depending on the configuration choices, optional NCrystal modules under different licenses might be enabled - see About for more details.

Algorithm: Described elsewhere

Input parameters

Parameters in boldface are required; the others are optional.

Links

• Component source code found in file NCrystal_process.comp.