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

The `NCrystal_Single_crystal` Instrument

Example instrument for Single_crystal with an NCrystal material

Identification

Site: NCrystal
Author: T. Kittelmann
Origin: ESS
Date: 2026

Description

A white beam hits a Single_crystal sample, whose crystal structure is taken
from an NCrystal material, and the scattered neutrons are recorded on a
spherical detector (Laue pattern) and on a banana detector. Optionally, a
non-crystalline phase is added with the parameters extra_phase and
extra_frac, e.g. giving the NCrystal cfg-string

"phases<0.9*stdlib::Al_sg225.ncmat&0.1*stdlib::Epoxy_Araldite506_C18H20O3.ncmat>"

for extra_frac=0.1.

Examples

(Test cases in bold)

Test: omega=0 Detector: laue_I=1.12
Test: crystal="stdlib::Al_sg225.ncmat;density=0.5x" Detector: laue_I=0.653
Test: crystal="stdlib::Ge_sg227.ncmat" omega=10 Detector: laue_I=4.87
Test: extra_frac=0.1 Detector: laue_I=9.46

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
crystal	string	NCrystal cfg-string of the crystal.	"stdlib::Al_sg225.ncmat"
extra_phase	string	NCrystal cfg-string of an additional non-crystalline phase (only used if extra_frac>0).	"stdlib::Epoxy_Araldite506_C18H20O3.ncmat"
extra_frac	1	Volume fraction of the additional phase.	0
omega	deg	Rotation of the crystal around the vertical axis.	0
mosaic	arcmin	Isotropic mosaic of the crystal.	30

The NCrystal_Single_crystal Instrument

Identification

Description

Examples

Input parameters

Links

The `NCrystal_Single_crystal` Instrument