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This page contains a minimal user guide / information for a set of supplemental Vitess modules (tested with current Vitess 3.3a release), based on these McStas 2.4.1 components/instruments:

(For more information about MCPL, please consult the website or publication.)

Please bear in mind that:

1) “This is not Vitess” - but just a set of user contributed, minimally documented modules
2) I have discussed the solution with Klaus Lieutenant, who has on his mind/agenda to create a proper, official Vitess release with similar functionality at a later point

Download here: ESS_2017_Modules_for_Vitess_0.99.tgz

The tar.gz (and corresponding GitHub repo at contains:

A) MODULES/ with binaries for Linux 64bit, Mac OS X and windows - corresponding to the following McStas components:

  1. ESS_butterfly.comp -> mcstas_ess_butterfly
  2. ESS_butterfly_MCPL_instr -> mcstas_ess_butterfly_mcpl
  3. MCPL_input -> mcstas_mcpl_input
  4. MCPL_output -> mcstas_mcpl_output

B GUI/ contains a set of test Vitess gui files making use of the modules

C SRC/ contains the original McStas code plus (light) documentation on the needed code changes


  1. Copy the modules corresponding to your platform from MODULES/ to your /where/ever/vitess/MODULES/
  2. Copy GUI/usermodule.tcl to your /where/ever/vitess/GUI/

Usage: Try the relevant .gui files found in subfolders of GUI/, respecting

  1. Change of directory to that folder
  2. All of the below "source" modules will only run from an "exported" shell or batch file - they produce no data when used from the Vitess GUI
  • ESS_butterfly
  • ESS_butterfly_mcpl
  • MCPL_input
  1. Please always specify a full path for the MCPL file when using the MCPL Input/Output modules
  2. When using the ESS_butterfly_MCPL module, please place the relevant beamport MCPL file from in the simulation folder

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