[ Identification | Description | Input parameters | Links ]
Guide_channeled ComponentModels a rectangular guide tube centered on the Z axis. The entrance lies in the X-Y plane. The guide may be tapered, and may have vertical subdivisions (used for bender devices). There is a special rotating mode in order to approximate a Fermi Chopper behaviour, in the case the neutron trajectory is nearly linear inside the chopper slits, i.e. the neutrons are fast w/r/ to the chopper speed. Slits are straight, but may be super-mirror coated. In this case, the component is NOT centered, but located at its entry window. It should then be shifted by -l/2. Example: Guide_channeled(w1=0.1, h1=0.1, w2=0.1, h2=0.1, l=2.0, R0=0.99, Qcx=0.0219, Qcy=0.0219, alphax=6.07, alphay=6.07, W=0.003, nslit=1, d=0.0005, mx=1, my=1) %BUGS This component does not work with gravitation on. Use Guide_gravity. This component does not work in multichannel focusing geometry.
| Name | Unit | Description | Default | |
| w1 | m | Width at the guide entry | ||
| h1 | m | Height at the guide entry | ||
| w2 | m | Width at the guide exit | 0 | |
| h2 | m | Height at the guide exit | 0 | |
| l | m | Length of guide | ||
| R0 | 1 | Low-angle reflectivity | 0.995 | |
| Qc | AA-1 | Critical scattering vector | 0 | |
| alpha | AA | Slope of reflectivity | 0 | |
| m | 1 | m-value of material. Zero means completely absorbing. | 0 | |
| nslit | 1 | Number of channels in the guide (>= 1) | 1 | |
| d | m | Thickness of subdividing absorbing walls | 0.0005 | |
| Qcx | AA-1 | Critical scattering vector for left and right vertical mirrors in each channel | 0.0218 | |
| Qcy | AA-1 | Critical scattering vector for top and bottom mirrors | 0.0218 | |
| alphax | AA | Slope of reflectivity for left and right vertical mirrors in each channel | 4.38 | |
| alphay | AA | Slope of reflectivity for top and bottom mirrors | 4.38 | |
| W | AA-1 | Width of supermirror cut-off for all mirrors | 0.003 | |
| mx | 1 | m-value of material for left and right vertical mirrors in each channel. Zero means completely absorbing. | 1 | |
| my | 1 | m-value of material for top and bottom mirrors. Zero means completely absorbing. | 1 | |
| nu | Hz | Rotation frequency (round/s) for Fermi Chopper approximation | 0 | |
| phase | deg | Phase shift for the Fermi Chopper approximation | 0 |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Guide_channeled.comp.
[ Identification | Description | Input parameters | Links ]
Generated on 2023-09-19 20:01:36