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[ Identification | Description | Input parameters | Links ]
The Guide_m Component
Neutron guide.
Identification
- Site:
- Author: Kristian Nielsen
- Origin: Risoe
- Date: September 2 1998, Modified 2013
Description
Models a rectangular guide tube centered on the Z axis. The entrance lies in the X-Y plane. For details on the geometry calculation see the description in the McStas reference manual. The reflectivity profile may either use an analytical mode (see Component Manual) or a 2-columns reflectivity free text file with format [q(Angs-1) R(0-1)]. Example: Guide(w1=0.1, h1=0.1, w2=0.1, h2=0.1, l=2.0, R0=0.99, Qc=0.021, alpha=6.07, m=2, W=0.003 %VALIDATION May 2005: extensive internal test, no bugs found Validated by: K. Lieutenant %BUGS This component does not work with gravitation on. Use component Guide_gravity then.
Input parameters
Parameters in boldface are required; the others are optional.| Name | Unit | Description | Default | |
| reflect | str | Reflectivity file name. Format [q(Angs-1) R(0-1)] | 0 | |
| w1 | m | Width at the guide entry | ||
| h1 | m | Height at the guide entry | ||
| w2 | m | Width at the guide exit | ||
| h2 | m | Height at the guide exit | ||
| l | m | Length of guide | ||
| R0_left | 1 | Low-angle reflectivity, left mirrror. | 0.99 | |
| R0_right | 1 | Low-angle reflectivity, right mirror. | 0.99 | |
| R0_top | 1 | Low-angle reflectivity, top mirror. | 0.99 | |
| R0_bottom | 1 | Low-angle reflectivity, bottom mirror. | 0.99 | |
| Qc_left | AA-1 | Critical scattering vector, left mirrror. | 0.0219 | |
| Qc_right | AA-1 | Critical scattering vector, right mirror. | 0.0219 | |
| Qc_top | AA-1 | Critical scattering vector, top mirror. | 0.0219 | |
| Qc_bottom | AA-1 | Critical scattering vector, bottom mirror. | 0.0219 | |
| alpha_left | AA | Slope of reflectivity, left mirrror. | 6.07 | |
| alpha_right | AA | Slope of reflectivity, right mirror. | 6.07 | |
| alpha_top | AA | Slope of reflectivity, top mirror. | 6.07 | |
| alpha_bottom | AA | Slope of reflectivity, bottom mirror. | 6.07 | |
| m_left | 1 | m-value of material. Zero means completely absorbing, left mirrror. | 2 | |
| m_right | 1 | m-value of material. Zero means completely absorbing, right mirror. | 2 | |
| m_top | 1 | m-value of material. Zero means completely absorbing, top mirror. | 2 | |
| m_bottom | 1 | m-value of material. Zero means completely absorbing, bottom mirror. | 2 | |
| W_left | AA-1 | Width of supermirror cut-off, left mirrror. | 0.003 | |
| W_right | AA-1 | Width of supermirror cut-off, right mirror. | 0.003 | |
| W_top | AA-1 | Width of supermirror cut-off, top mirror. | 0.003 | |
| W_bottom | AA-1 | Width of supermirror cut-off, bottom mirror. | 0.003 |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Links
- Source code for
Guide_m.comp.
[ Identification | Description | Input parameters | Links ]
Generated on mcstas 3.5.32
