McStas logo McStas - A neutron ray-trace simulation package ILL; PSI; ESS Niels Bohr Institute DTU Physics NEXMAP

McStas

About McStas
 Conditions of use
 Authors/Contacts
 Project funding
 Screenshots

Download
 Components
 Linux Install (deb/rpm)
 Mac OS X Install
 Unix Install (src code)
 Windows Install
 Other Downloads (share)

Mailing list

Search web/mailinglist

Documentation
 McStas manual
 FAQ
 Known problems
 Publications
 C Compilers
 Other
 Tools
 Tutorial

Workshops/conferences

Developments

Links

Report bugs

Git

McStas Ubuntu live-dvd


McStas: ESS_butterfly_test Instrument at ESS

[ Identification | Description | Input parameters | Output parameters | Links ]

The ESS_butterfly_test Instrument

Test instrument for the updated BF1 butterfly moderator design

Identification

  • Site: ESS
  • Author: Peter Willendrup
  • Origin: ESS
  • Date: 2016-08-24
  • Version:(Unknown)

Description

Test instrument for the updated BF1 butterfly moderator design.

The below example gives a 50-50 (statistics-wise) cold/thermal beam at beamline N10.
Example: mcrun -n1e6 ESS_butterfly_test.instr sector=N beamline=10 cold=0.5

This variant is set up with time-focusing from the source - for comparison with with ESS_butterfly_tfocus_NOFOCUS_test which runs without focusing from the source.


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" 0
dist m Distance from origin to focusing rectangle; at (0,0,dist) - alternatively use target_index 100
cold 1 Defines the statistical fraction of events emitted from the cold part of the moderator 0.5
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
tfocus_dist 10
tfocus_time 0.01
tfocus_width 0.001

Links


[ Identification | Description | Input parameters | Output parameters | Links ]

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Mon May 22 14:59:10 2017


Last Modified: Monday, 22-May-2017 16:59:10 CEST
Search website mailinglist archive GitHub repos