[ Identification | Description | Examples | Input parameters | Links ]
ESS_butterfly_MCPL_test InstrumentTest instrument for the updated BF1 butterfly moderator design using MCPL input files. The instrument includes a simple guide with 10 m straight flight-path followed by a 50 m curved guide. The below example gives a 50-50 (statistics-wise) cold/thermal beam at beamline S2 using the base S2 MCPL file from https://public.esss.dk/users/willend/MCPL/S2.mcpl.gz Example: sector=S beamline=2 Detector: Monitor2_xy1_I=1.59e+11 and a 'preconditioned' version of this the file from https://public.esss.dk/users/willend/MCPL/S2_filtered.mcpl.gz (This file is fetched via a curl command at code-generation time) Example: sector=S beamline=2 filter=1 Detector: Monitor2_xy1_I=1.59e+11
| Name | Unit | Description | Default |
| sector | str | Defines the 'sector' of your instrument position. Valid values are "N","S","E" and "W" | "S" |
| beamline | 1 | Defines the 'beamline number' of your instrument position. Valid values are 1..10 or 1..11 depending on sector | 2 |
| 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" | 0 |
| dist | m | Distance from origin to focusing rectangle; at (0,0,dist) - alternatively use target_index | 2 |
| cold | 1 | Defines the statistical fraction of events emitted from the cold part of the moderator | 10.5 |
| 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 | 4e8 | |
| filter | 1 | Use a 'preconditioned' MCPL file that removes non-transportable neutrons (energy, position, emmision coordinates etc.) Generate such inputs using ESS_MCPL_generate_filtered. | 1 |
| repeat | Number of MCPL file repetitions (only valid with use of MCPL_input, not with MCPL_input_once | 1 | |
| v_smear | 1 | When repeating events, make a Gaussian MC choice within v_smear*V around particle velocity V | 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 |
| allmons | 1 | Flag to include also debugging-monitor output | 0 |
ESS_butterfly_MCPL_test.instr.
[ Identification | Description | Examples | Input parameters | Links ]
Generated for mcstas 3.8.4