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[ Identification | Description | Examples | Input parameters | Links ]
The Test_PowderN Instrument
Unit-test instrument for the PowderN sample component.
Identification
- Site: Tests_samples
- Author: Erik B Knudsen (erkn@fysik.dtu.dk)
- Origin: DTU Physics
- Date: 2009
Description
Simply a model source illuminating a powder sample. The default sample itself is an LaB6-powder. Alternatively, the Single_crystal (powder mode) and FluoPowder components can also be tested.
Examples
(Test cases in bold)- Test: index=1 Detector: Sph_mon_I=1.26755e-11
- Example: index=2 Detector: Sph_mon_I=4.44793e-13
- Test: index=3 Detector: Sph_mon_I=1.98093e-11
- (Unittest disabled for Single_crystal powder-mode, numerically unstable on GPU)
Input parameters
Parameters in boldface are required; the others are optional.| Name | Unit | Description | Default |
| E0 | keV | Source energy (width 1 keV) | 15 |
| L1 | m | Source-sample distance | 10 |
| directbeam | 1 | Suppress direct beam (0) or not (1) | 0 |
| reflections | str | List of powder reflections, LAU/LAZ/CIF format. | "LaB6.cif" |
| SPLITS | 1 | Number of SPLIT's before sample | 1 |
| frac_c | 1 | Fraction of stats assigned to coherent scattering | 0.8 |
| frac_i | 1 | Fraction of stats assigned to incoherent scattering | 0.1 |
| frac_t | 1 | Fraction of stats assigned to unscattered, "direct beam" | 0.1 |
| d_phi | deg | Angle corresponding to the vertical angular range to focus to, e.g. detector height. 0 for no focusing. | 0 |
| index | 1 | Index of the sample component to use. 1=PowderN, 2=Single_crystal, 3=FluoPowder | 1 |
Links
- Source code for
Test_PowderN.instr.
[ Identification | Description | Examples | Input parameters | Links ]
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