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Institut Laue-Langevin

The Computing for Science (CS) group supports ILL scientists, students and visitors in a number of activities including data analysis, instrument simulation and sample simulation.

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Eddy Lelièvre-Berna, Alain Filhol, Antoine Français, Olivier Pernet, Emmanuel Perrier, Jonathan Raffin, Jean-Xavier Boucherle, Françoise Givord

A road map for processing polarised neutron data
iFitIt is a JAVA graphical interface which partially automates and makes easier the steps of the processing of polarized neutron data. It drives a set of FORTRAN scientific programs, federates their parameter and data sets and computes standard deviations through a perturbation method.
It has been designed with in mind a “standard data processing strategy”. In the latter both the extinction and depolarization corrections are refined from the polarized neutron dataset itself.
The concurrent approach - extinction estimated from unpolarised neutron measurements -  will also be implemented in iFitIt in the future.


Warnings :

  • The current application is Mac OS X only. (Windows and Linux versions soon to come)
  • The project is still in progress but a draft version is available below


  • download the Mac OS X application here.  (2.8 Mb)
  • download the manual here.  (7.4 Mb)


  • The JAVA interface is operational and implements most of the features described in the manual. However, the undo/redo is not yet fully operational, the computation of standard deviations through a perturbation method is not yet implemented.
  • The FORTRAN programs are operational but a bug in the diamagnetism algorithm is not yet fixed.
  • Most of the development is performed on the Mac OS X platform.

Last update: A. Filhol, 17 Sept 2007.