[ Identification | Description | Input parameters | Links ]
ILL_H22_D1A InstrumentD1A is a reliable diffractometer for standard crystallographic problems. It gives excellent results with the Rietveld method owing to its near perfect Gaussian peak-shape in the 2θ-range 30° to 150°. Special features include a high fixed take-off angle of 122 deg, giving high resolution at large scattering angles (up to 160 deg); a bank of 25 high efficiency collimators and counters; an anisotropically squashed germanium monochromator focussing a 250 mm high beam onto only 30 mm; a wide choice of wavelengths, from 1.39 Angs to 2.99 Angs, quickly available by simple rotation of the focussing monochromator; The large monochromator take-off angle means that the diffraction pattern is focussed for the parallel geometry shown (2θ = 122°). The counter can be swept through 0 deg to 2θ = 160° deg for the highest angle counter, usually in steps of 0.05 deg. Monochromator Neutron wavelength Ge 117 DM=0.7946 AA 1.390 Ge 335 DM=0.8655 AA 1.514 Ge 115 DM=1.0925 AA 1.911 (optimal) Ge 113 DM=1.712 AA 2.994 The sample is a powder, in a container can, all positioned in an Al environment (e.g. cryostat/furnace shield). This instrument was installed on the H22 guide.
| Name | Unit | Description | Default |
| lambda | Angs | Wavelength at monochromator | 1.911 |
| dlambda | Angs | Wavelength-spread around lambda at source | 0.03 |
| DM | Angs | d-spacing of monochromator. Use DM=0 to compute the values from the requested wavelength. | 0 |
| RV | m | Radius of vertical focussing. flat for 0 | -1 |
| powder | str | File name for powder sample description | "Na2Ca3Al2F14.laz" |
| container | str | File name for container decription in Al cryostat/furnace | "V.laz" |
ILL_H22_D1A.instr.
[ Identification | Description | Input parameters | Links ]
Generated on 2024-06-16 23:04:36