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[ Identification | Description | Input parameters | Links ]
The ESS_butterfly_MCPL_test Instrument
Test instrument for the updated BF1 butterfly moderator design using MCPL input
Identification
- Site: ESS
- Author: Peter Willendrup
- Origin: ESS
- Date: 2016-09-26
Description
Test instrument for the updated BF1 butterfly moderator design using MCPL input files. The below example gives a 50-50 (statistics-wise) cold/thermal beam at beamline N10. Example: sector=N beamline=10 cold=0.5 Assumes access to binary MCPL datasets in . named [sector][beamline].mcpl.gz, i.e. W8.mcpl.gz.
Input parameters
Parameters in boldface are required; the others are optional.| Name | Unit | Description | Default |
| sector | str | Defines the 'sector' of your instrument position. Valid values are "N","S","E" and "W" | "N" |
| beamline | 1 | Defines the 'beamline number' of your instrument position. Valid values are 1..10 or 1..11 depending on sector | 1 |
| Lmin | AA | Minimum wavelength simulated | 0.2 |
| Lmax | AA | Maximum wavelength simulated | 20 |
| c_performance | 1 | Cold brilliance scalar performance multiplicator c_performance > 0 | 1 |
| t_performance | 1 | Thermal brilliance scalar performance multiplicator t_performance > 0 | 1 |
| index | 1 | Target index for source focusing. Defaults to illuminate the "cold collimated" brilliance monitor, thereby suppressing "dist" | 8 |
| dist | m | Distance from origin to focusing rectangle; at (0,0,dist) - alternatively use target_index | 0 |
| cold | 1 | Defines the statistical fraction of events emitted from the cold part of the moderator | 1 |
| Yheight | m | Defines the moderator height. Valid values are 0.03 m and 0.06 m | 0.03 |
| delta | m | Parameter that allows to scan "collimator" position | 0 |
| thres | Weight-threshold, neutrons with higher weight are absorbed | 0.003 | |
| filter | 0 | ||
| repeat | Number of MCPL file repetitions | 1 | |
| E_smear | 1 | When repeating events, make a Gaussian MC choice within E_smear*E around particle energy E | 0.1 |
| pos_smear | m | When repeating events, make a flat MC choice of position within pos_smear around particle starting position | 0.01 |
| dir_smear | deg | When repeating events, make a Gaussian MC choice of direction within dir_smear around particle direction | 0.01 |
Links
- Source code for
ESS_butterfly_MCPL_test.instr. - Benchmarking website available at http://ess_butterfly.mcstas.org
[ Identification | Description | Input parameters | Links ]
Generated on 2022-12-15 07:34:57
