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Director Discretionary's Time (DDT)

The ILL is dedicated to helping its visiting researchers to make the most of its facilities. Neutron beams and instrument access are provided free of charge for proposers of accepted experiments.

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Applying for beamtime

User Club

The ILL User Club provides online access to all the information and administrative tools for our scientific visitors, presented in a user friendly environment.

Director Discretionary's Time (DDT)

5% of ILL beam time is reserved for proposals that do not fall within the usual rules of proposal submission.
Primarily these proposals concern urgent experiments that cannot wait for the twice-yearly proposal rounds.

Applications for Director Discretionary's Time may be submitted at any time to the ILL Director of Science, Prof Mark Johnson, who will decide wether accepting it or not after consultation with the college secretary and/or the chair of the proposal sub-committee concerned and the ILL science director.
If successful, beam time will then be awarded on the requested instrument as soon as possible.

New : DDT may also be used to award beam time to excellent proposals which do not satisfy the rule in which two-thirds of the proposers must come from ILL's Associate and Scientific Member countries (see two-thirds rule below). These proposals can therefore be submitted by any team with an excellent idea for an experiment and this must be done through the usual proposal rounds so that the level of excellence can be judged by comparison with other proposals.

Fill in the appropriate form with your personal details and proposal description.


Directors Discretion Time proposal

Microsoft Word

Directors Discretion Time proposal

Acrobat PDF (for Mac, Unix & Windows)

Directors Discretion Time proposal (unlocked)

Microsoft Word