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Proposals Overview

Proposals submitted to FACET and Test Beam Facilities are peer reviewed. The highest rated proposals are most likely to be offered beam time approximately one year after submission depending on the scope of infrastructure changes required to support the experiment.

All our facilities (FACET, ESTB, NLCTA and ASTA) can be applied to through the same proposal process.​ You can apply to multiple facilities with the same proposal. If we feel that a proposal is more appropriate at a facility other than the one applied for (or multiple facilities) we will be in touch with you.

  • ​​Proposals are accepted any time of the year for any of the facilities (FACET, NLCTA, ESTB or ASTA). ​
  • To submit a proposals, please use our template​.
  • Email the proposal to our website.
  • To follow up or ask questions about the process, please email Christine Clarke.

We recommend that you check the beam parameters and infrastructure available at our facilities and contact one of our team to help develop the proposal.


Management Contacts

Division Director: Vitaly Yakimenko,  

Experimental Program: Mark Hogan,  

Facility Contact Information

Safety Officer
John Seabury
(650) 926-7458
Technical Support
Keith Jobe
(650) 926-2084
Stephen Weathersby
(650) 926-3890
Carsten Hast
(650) 926-8556
Christine Clarke
(650) 926-5746
Keith Jobe
(650) 926-2084

Facility Beam Parameters


Beam Type
e-, e+
Beam energy (MeV)
60, 80-120
Repetition Rate (Hz)
1 - 30
Bunch Intensity (E8)
2-25 or
single particle
Bunch Length (s , µm)
Beam Spot size (s , µm)

To submit a proposal to any of our facilities

Proposals should be approximately five pages long and use the provided template.


You can submit a proposal to multiple beam lines if appropriate - FACET, NLCTA, ESTB and ASTA.​

Review Process

For the ESTB review process, please see the ESTB page.

ASTA, FACET and NLCTA proposals (and some ESTB proposals that are redirected) are reviewed by the process as described in the rest of this section.

Peer review is an essential element in ensuring that experimental facilities are utilized for the highest quality science and that the allocation of this scarce resource is fair and transparent.

Once a complete proposal is received, it is assigned to the SLAC Accelerator Research Experimental program Committee (SAREC) which consists of scientists with expertise in various research fields, plus other external advisors. 

In many cases, the proposal is invited to be presented in front of the committee and is reviewed by multiple experts. The review is usually a two day meeting comprising new proposal presentations, facility updates and experiment status reports. The committee delivers a close-out report at the end of the review rating the new proposals.

Proposals are rated using the following rating scale: Excellent (1), Very Good (2), Good (3), Fair (4), and Poor (5). The rating is based on peer review taking into account the proposed experiment and the entire body of work being performed by the scientific team. ​

The SAREC committee charge can be found on our website.

Ratings Appeal

Appeals must be received within 30 days of the review/rating notification. Appeals should be addressed to the FACET Research Administration Manager. The only accepted grounds for appeal are in cases when the remarks supplied by the SAREC are not a sufficient explanation of the rating or when unanticipated experimental results or new instrumentation has been developed since the initial proposal was submitted which would significantly impact peer review. ​

Staying in touch

You can sign up for our mailing list to receive calls for proposals and announcements of meetings. To subscribe, send an email to LISTSERV@SLAC.STANFORD.EDU . The subject doesn't matter, but the text should say subscribe facet-interest.

The FACET Plasma Wakefield Acceleration Program

FACET was designed to meet the Department of Energy Mission Need Statement for an Advanced Plasma Acceleration Facility. A key component of the experimental program at FACET, and approximately half of the beam time, is second-generation research in plasma wakefield acceleration. Topics include high-gradient electron acceleration with narrow energy spread and preserved emittance, efficiency, high-gradient positron acceleration and radiation generation. This program of FACET research is directed at understanding and establishing plasma wakefield acceleration as a viable particle acceleration technique. Researchers interested in plasma wakefield acceleration are encouraged to propose a multi-year program addressing the critical issues for this technology. 

We specifically encourage the formation of a broad plasma wakefield collaboration to develop both individual research proposals and an overall strategic plan for demonstrating an understanding of this approach as a particle acceleration technique. Plasma experiments should still be proposed through the route outlined above with each experiment studying a distinct aspect. Though collaboration is naturally encouraged to share resources and expertise, we strongly welcome groups that have not yet been a part of the program at FACET. 

To propose new experiments for our plasma program and to join our efforts to generate a coordinated approach to developing this technique, please contact Mark Hogan, our Scientific Lead at FACET. 



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