[ Identification | Description | Input parameters | Links ]

The Union_NCrystal_material Component

Version: $Revision: 0.1 $

Identification

• Author: Mads Bertelsen
• Origin: ESS DMSC
• Date: 2026-09-28

Description

Creates one NCrystal scattering process and a complete Union material. The
absorption coefficient is obtained from the same NCrystal configuration, so
density modifiers such as density=0.6x are applied automatically. Use
NCrystal_process together with Union_make_material when NCrystal scattering
must be combined with other Union processes.
The user does not provide my_absorption for this component.

This component requires a Union geometry and Union_master.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
cfg	str	NCrystal material configuration string (details on this page).	""
interact_fraction	1	Fraction of scattering events assigned to this process 0-1 (default -1 lets Union assign it).	-1
include_SLD	0/1	Include the scattering length density calculated from cfg in the material refraction information.	0
init	string	Deprecated and unused. Accepted so that instruments written for McStas/McXtrace 3.8.7 and earlier, which name the Union_init component here, still compile. *******************************************************************************/	""

AT (	,	,		) RELATIVE		Generate to clipboard
ROTATED (	,	,		) RELATIVE

Links

• Source code for Union_NCrystal_material.comp.

---

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

Generated on mcstas 3.9.2

---

Last Modified: Tuesday, 06-Oct-2026 21:19:12 CEST