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McStas: ESS_butterfly_test

[ Identification | Description | Input parameters | Links ]

The ESS_butterfly_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: mcrun -n1e6 ESS_butterfly_MCPL_test.instr 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.
NameUnitDescriptionDefault
sectorstrDefines the 'sector' of your instrument position. Valid values are "N","S","E" and "W""N"
beamline1Defines the 'beamline number' of your instrument position. Valid values are 1..10 or 1..11 depending on sector1
LminAAMinimum wavelength simulated0.2
LmaxAAMaximum wavelength simulated20
c_performance1Cold brilliance scalar performance multiplicator c_performance > 01
t_performance1Thermal brilliance scalar performance multiplicator t_performance > 01
index1Target index for source focusing. Defaults to illuminate the "cold collimated" brilliance monitor, thereby suppressing "dist"8
distmDistance from origin to focusing rectangle; at (0,0,dist) - alternatively use target_index0
cold1Defines the statistical fraction of events emitted from the cold part of the moderator1
YheightmDefines the moderator height. Valid values are 0.03 m and 0.06 m0.03
deltamParameter that allows to scan "collimator" position0
thres0.003
filter0
repeat1
E_smear0.1
pos_smear0.01
dir_smear0.01

Links


[ Identification | Description | Input parameters | Links ]

Generated on 2024-01-03 11:47:43


Last Modified: Wednesday, 03-Jan-2024 19:59:11 CET
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