[ Identification | Description | Input parameters | Links ]
Phonon_simple ComponentSingle-cylinder shape. Absorption included. No multiple scattering. No incoherent scattering emitted. No attenuation from coherent scattering. No Bragg scattering. fcc crystal n.n. interactions only One phonon branch only -> phonon polarization not accounted for. Bravais lattice only. (i.e. just one atom per unit cell) Algorithm: 0. Always perform the scattering if possible (otherwise ABSORB) 1. Choose direction within a focusing solid angle 2. Calculate the zeros of (E_i-E_f-hbar omega(kappa)) as a function of k_f 3. Choose one value of k_f (always at least one is possible!) 4. Perform the correct weight transformation
| Name | Unit | Description | Default | |
| radius | m | Outer radius of sample in (x,z) plane | ||
| yheight | m | Height of sample in y direction | ||
| sigma_abs | barns | Absorption cross section at 2200 m/s per atom | ||
| sigma_inc | barns | Incoherent scattering cross section per atom | ||
| a | AA | fcc Lattice constant | ||
| b | fm | Scattering length | ||
| M | a.u. | Atomic mass | ||
| c | meV/AA^(-1) | Velocity of sound | ||
| DW | 1 | Debye-Waller factor | ||
| T | K | Temperature | ||
| target_x | m | position of target to focus at . Transverse coordinate | 0 | |
| target_y | m | position of target to focus at. Vertical coordinate | 0 | |
| target_z | m | position of target to focus at. Straight ahead. | 0 | |
| target_index | 1 | relative index of component to focus at, e.g. next is +1 | 0 | |
| focus_r | m | Radius of sphere containing target. | 0 | |
| focus_xw | m | horiz. dimension of a rectangular area | 0 | |
| focus_yh | m | vert. dimension of a rectangular area | 0 | |
| focus_aw | deg | horiz. angular dimension of a rectangular area | 0 | |
| focus_ah | deg | vert. angular dimension of a rectangular area | 0 | |
| gap | meV | Bandgap energy (unphysical) | 0 |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Phonon_simple.comp.
[ Identification | Description | Input parameters | Links ]
Generated on 2024-01-03 11:47:43