LATEST UPDATE: Proposal submission is again OPEN for both DUBBLE beamlines BM26 and BM14 for the 2022 Spring proposal submission round (Deadlines March 1st for ESRF users and April 1st for DUBBLE users). However, in 2022 both beamlines will operate at 50% capacity which means only 50% of the usual amount shifts will be available. For Dutch user groups, they will be able to apply for beamtime via the ESRF proposal submission route or in collaboration with Flemish users applying via DUBBLE-CRG proposal submission route where the main proposer is affiliated to a Flemish University/Institute.


The roughly 280 shifts at each DUBBLE beam line yearly available to Dutch and Flemish researchers are allocated through a system which closely mirrors that of the ESRF. Proposals are evaluated for two scheduling periods per year and are collected at deadlines on 1st April and 1st October. Users submit their proposals via the ESRF user portal, using the ESRF formats. These proposals are forwarded to the NWO administration who presents them at the DUBBLE project leader for a technical assessment and to the Review Committee, a panel of independent, international experts in the DUBBLE techniques. Each Review Committee member (of which there are typically five) independently grades the proposals on their scientific and technological relevance and submits the result to the DUBBLE Program Committee who combines all the scores into a priority list which is accepted as is, unless the technical feasibility report by the project leader would advise against a given proposal. Occasionally, the number of requested shifts is amended on technical grounds. Shifts are allocated from the top to the bottom of the list up to when the amount of available shifts has been reached. Typically, 25 proposals of 6, 9 or 12 shifts for SAXS/WAXD (BM26) and 25 proposals for X-ray spectroscopy (BM14) are allocated in that way per scheduling period (of which there are two per year). Typically five proposals are put in a reserve list for the case unexpectedly allocated beam time is not taken up or if excess beam time would be available.

The priority list is ultimately forwarded to the DUBBLE steering committee for ratification. The downstream handling and execution of experiments at DUBBLE from there on follows the ESRF procedure, safety aspects included. Dutch and Flemish DUBBLE users can make use of the ESRF facilities, including the on-site guest house and canteen against payment.

Users, identified as being new by the Program Committee are granted beam time for a limited number of shifts (typically 9), irrespective of the position the proposal obtained in the priority list. In that way, the application for beam time by new users is encouraged. This mechanism permits new users to gain experience, which can be put at work in the formulation of new proposals for beam time at DUBBLE or other ESRF beam lines.

Please note that besides for SAXS/WAXD (at BM26) and X-ray spectroscopy (at BM14), Dutch and Flemish users can also apply for beam time at the Swiss-Norwegian Beamlines (SNBL; BM01, BM31) in the framework of a beam time exchange agreement with SNBL. The interested users should still select the DUBBLE beamlines for their proposals and indicate in the proposal text that they would like to do their experiment at the Swiss-Norwegian beamline.

For further information on how to apply for beam time at BM26, BM14 or the SNBL beamlines as Dutch or Flemish user please follow this link for application procedures for Dutch and Flemish users.

Here you can find more ESRF Practical Information.


Besides regular proposals for a limited number of beam time shifts, Flemish and Dutch DUBBLE users may also submit Long-Term proposals (LTPs), requesting a long-term commitment to provide beam time during up to six successive scheduling periods (three years). Scientific excellence is the primary criterion for the acceptance of an LTP. Further criteria are: (a) a commitment from the proposing user group concerning the contribution of financial, technical and/or human resources during the implementation of the LTP and (b) an identifiable benefit to the user community (such as a new technique, a new instrument or new possibilities for the beamline) expected to result from the successful accomplishment of the goals of the LTP. Each LTP undergoes a two-step appraisal procedure, the first step taking place at the project definition by the DUBBLE Project Leader, and the second carried out by the DUBBLE Program Committee. The LTP is also sent to the external Review committee for a qualitative assessment to facilitate the appraisal by the DUBBLE Program Committee who finally decides on whether or not an LTP proposal should be granted. Ratification follows in the DUBBLE Steering committee. Once approved, the objectives of the LTP are integrated within the DUBBLE work plan. The LTP progress is periodically evaluated by the DUBBLE Program committee.  Through the option of LTPs user groups are stimulated to actively participate in developments at DUBBLE. To not endanger the regular user program, the granting of LTPs is limited.

Guidelines and application form for Long Term Proposals.