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[ Identification | Description | Input parameters | Links ]
The Transmission_V_polarisator Component
Transmission V-polarisator including absorption by Fe in the supermirror. Experimentally benchmarked.
Identification
- Site:
- Author: Andreas Ostermann (additions from Michael Schneider, SNAG)
- Origin: TUM
- Date: 2024
Description
Transmission V-polarisator including absorption by Fe in the supermirror. Example: Transmission_V_polarisator(w1=0.050, h1=0.050, w2=0.050, h2=0.050, l=2.700, waferD=0.0003, FeD=2.16e-06, Si_i=0.2, Si_a=0.215, R0=0.99, Qc=0.02174, alpha=4.25, W=0.001, mleft=1.2, mright=1.2, mtop=1.2, mbottom=1.2, reflectUP="measured_up_q.dat",reflectDW="measured_dw_q.dat")
Input parameters
Parameters in boldface are required; the others are optional.| Name | Unit | Description | Default | |
| reflectUP | str | Reflectivity profile of the FeSi-wafer for spin-up neutrons; columns [q,R] | 0 | |
| reflectDW | str | Reflectivity profile of the FeSi-wafer for spin-down neutrons; columns [q,R] | 0 | |
| w1 | m | Width at the polarizer entry | ||
| h1 | m | Height at the polarizer entry | ||
| w2 | m | Width at the polarizer exit | ||
| h2 | m | Height at the polarizer exit | ||
| l | m | length of polarizer | ||
| waferD | m | Thickness of Si wafer | ||
| Si_i | barns | Scattering cross section per atom (barns) | ||
| Si_a | barns | Absorption cross section per atom (barns) at 2200m/s | ||
| FeD | m | Thickness of Fe in supermirror, Ti is neglected | ||
| R0 | 1 | Low-angle reflectivity of the outer guide | 0.99 | |
| Qc | AA-1 | Critical scattering vector of the outer guide | 0.02174 | |
| alpha | AA | Slope of reflectivity of the outer guide | 4.25 | |
| W | AA-1 | Width of supermirror cut-off of the outer guide | 0.001 | |
| mleft | 1 | m-value of material for left. vert. mirror of the outer guide | -1 | |
| mright | 1 | m-value of material for right. vert. mirror of the outer guide | -1 | |
| mtop | 1 | m-value of material for top. horz. mirror of the outer guide | -1 | |
| mbottom | 1 | m-value of material for bottom. horz. mirror of the outer guide | -1 |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Links
- Source code for
Transmission_V_polarisator.comp. - P. Böni, W. Münzer and A. Ostermann: Physica B: Condensed Matter Volume 404, Issue 17, 1 September 2009, Pages 2620-2623
[ Identification | Description | Input parameters | Links ]
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