[ Identification | Description | Input parameters | Links ]

# The `Powder_validation` Instrument

## Identification

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

## Description

    Validation of Union powder against standard PowderN component.

## Input parameters

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
div | deg | Source divergence (angular w and h) | 1.5
d_phi | deg | Restriction of Debye-Scherrer cones around scattering plane 0=full illumination | 30

## Links

- Source code for `Powder_validation.instr`.

[ Identification | Description | Input parameters | Links ]