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The following guide assumes the use of either

  1. McStas 2.3 (Apr. 06, 2016) plus
    1. - Component library: McStas-2.3, built Sep. 15, 2016 (which includes MCPL v. 0.6)
    2. The instrument file ESS_butterfly_MCPL from the McStas GitHub repository
    3. The updated MCPL_input component from the McStas GitHub repository
    4. If you need to WRITE MCPL files, also download the updated MCPL_output component from the McStas GitHub repository

  2. McStas 2.4 (May. 17, 2017) (which includes MCPL v. 1.1)
    1. If you need to WRITE MCPL files, also also download the updated MCPL_output component from the McStas GitHub repository
    2. The instrument file ESS_butterfly_MCPL from the McStas GitHub repository

  3. McStas 2.4.1 (June 26 2017 - and default on the ESS cluster) includes the right versions of all of the above!

Input datasets:

You will also need an MCPL input file for the beamline in question. The files are available in easy-to-use limited-statististics files here, named <Sector><Beamline>.mcpl.gz  (e.g. W8.mcpl.gz). The key numbers and properties of these files are:

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  1. For use on your own computer, download the relevant file from http://public.esss.dk/users/willend/MCPL/ - REMEMBER THEY ARE BIG!
  2. For use at the ESS cluster, please use the links provided in http://public.esss.dk/users/willend/MCPL-links.tgz that "deep-link" to an example 1e5 proton file from Esben Klinkby's MCPL data suite
  3. If you need any special type of MCPL datafile (bigger, smaller, filtered one way or another...) please write Esben Klinkby an email, putting Peter Willendrup cc

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We now turn our attention to the supplied ESS_butterfly_MCPL instrument file. The below text is a summary only, PLEASE STUDY IT YOURSELF!

  • IMPORTANT: It is meant as a template for you to do further work - it does not resemble any physical instrument concept or design!

The most important properties of the file is

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