Rapid Access proposals include Special Requests and Letters of Intent, and provide the opportunity to allow feasibility studies that are not propriety in nature. These studies may be eligible for a limited amount of discretionary beamtime depending on the availability of the requested beamline and the type of work.  The Science Director approves all Rapid Access proposals prior to the experiment being performed. It is required that you discuss your research activity with the appropriate CLS Beamline Responsible prior to submitting an application.

Special Request

Special Request proposals are accepted throughout the year for operational and commissioning beamlines but must be received a minimum of four weeks prior to your desired scheduled experiment date to allow for the necessary safety, technical, and ethics (if required) reviews to be conducted. All proposals must be approved prior to performing the experiment.

Letter of Intent

Letters of Intent provide the opportunity to perform exploratory experiments as the beamline is being commissioned. Research must be discussed with the appropriate CLS Beamline Responsible to confirm feasibility and timeframe prior to submitting an application. Letters of Intent are accepted throughout the commissioning phase by submitting a Rapid Access proposal.

Process to Apply for Rapid Access

  1. Contact the appropriate CLS Beamline Responsible to discuss your research and to confirm that the beamline is capable of performing your experiment.
  2. Submit a Rapid Access Proposal.

Note: You must be a registered User to create and submit a proposal.


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If you’re looking for information on how you can use CLS techniques in your research program, please contact us using this form.

Example queries may include: Feasibility around a potential experiment? A scientific problem we can help you solve? Is your question related to a specific technique? Do you want to know more about how to apply for beamtime?