[ Identification | Description | Examples | Input parameters | Links ]
FRMII_SPODI_MULTI InstrumentSPODI is a high-resolution thermal neutron diffractometer at the research reactor Heinz Maier-Leibnitz (FRM II) especially dedicated to structural studies of complex systems. Unique features like a very large monochromator take-off angle of 155 degrees and a 5 m monochromator-sample distance in its standard configuration achieve both high-resolution and a good profile shape for a broad scattering angle range of 160 degrees. Two-dimensional data are collected by an array of 80 vertical position sensitive 3He detectors typically during 40 resolution steps of 0.05 degrees. List of available wavelengths in A delivered by germanium monochromator: Reflection Take-off 155 degrees, L2=5m Take-off 135 degrees, L2=2.8m Ge 331 2.536 A 2.396 A Ge 551 1.549 A 1.463 A Ge 771 1.111 A 1.050 A The implemented model corresponds to the standard setup with the take-off angle of 155 degrees, Ge 551 reflection giving rise to the wavelength of ~1.5482 AA, and L2 of 5 m.
| Name | Unit | Description | Default |
| lambda | A | Wavelength; if 0, calculated from HKLmono and TOA | 1.5482 |
| HKLmono | str | Miller indices of the Ge-monochromator reflection | "551" |
| TOA | deg | Take-Off Angle; if 0, calculated from HKLmono and lambda | 0 |
| L2 | m | Distance from the monochromator to the sample | 5.0 |
| Dsample | m | Sample diameter | 8e-3 |
| Hsample | m | Sample height | 40e-3 |
| Powder | str | LAZ/HKL/PCR/CIF file for powder description | "Na2Ca3Al2F14.laz" |
| Holder | Flag to enable (1) / disable (0) the vanadium sample holder | 0 | |
| StartTheta | deg | Start angle of the detector system relative to the beam | 0 |
| ResStep | deg | Resolution step in degrees (standard is 0.05 deg) | 0.05 |
| iResStep | deg | Index number of resolution step (between 0 and 39 for standard 0.05 deg) | 0 |
FRMII_SPODI_MULTI.instr.
[ Identification | Description | Examples | Input parameters | Links ]
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