The `Union_powder_validation` Instrument

Site: Union_demos
Author: Mads Bertelsen
Origin: Johns Hopkins University, Baltimore
Date: May 2016

Identification

Validation of Union powder against standard PowderN component.

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
comp_select	1	1: Union components, 2: PowderN	1
material_data_file	string	Powder sample definition	"Al.laz"
E0	meV	Source mean energy	100
dE	meV	Source energy spread	2
sample_radius	m	Sample radius	0.01
sample_height	m	Sample height	0.01
pack		Sample packing factor	1
sigma_inc	barns	Sample incoherent cross-section	0.0328
sigma_abs	barns	Sample absorption cross-section	0.924
Vc	AA	Sample unit cell volume	66.4
geometry_interact		p_interact for the sample	0.5
incoherent_fraction		Fraction of statistics assigned for incoherent scattering	0.2