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What is FACET?

FACET's unique electron and positron beams provide a broad range of science opportunities from advanced accelerator R&D to materials science research. FACET is the only facility in world with the high intensity drive bunches necessary for high-gradient plasma and dielectric wakefield acceleration. Our infrastructure includes high brightness terahertz (THz) sources, a 20 TW laser and multi-purpose vacuum chambers ...


FACET is a unique R&D facility for experimental beam physics using the SLAC linac. FACET provides high energy density electron and positron beams with peak currents of approximately 20 kA that are focused down to below 30x30 micron transverse spot size at an energy of 20 GeV.
FACET's unique high power beams provide important science opportunities in many fields. The majority of the FACET beam time is allocated to plasma wakefield acceleration research. In addition, FACET supports a broad user program in accelerator science, materials science, high-energy density physics and other fields of research that can take advantage of these intense beams and the intense fields that are generated.
Examples of possible topics of study include dielectric wakefield acceleration, terahertz radiation, materials study in extreme conditions and novel sources of radiation using plasmas, crystals and meta-materials.

Advanced Accelerator Research and The FACET Plasma Wakefield Acceleration Program

Advanced accelerator research promises to improve the power and efficiency of today's particle accelerators, enhancing applications in medicine and high-energy physics and providing potential benefits for research in materials, biological and energy science. FACET studies plasma acceleration, using short, intense pulses of electrons and positrons to create an acceleration source called a plasma wakefield accelerator.

Plasma wakefield acceleration is one of the most promising approaches to advancing accelerator technology. This approach offers a potential 1,000-fold or more increase in acceleration over a given distance, compared to existing accelerators. SLAC is the only place in the world with the high peak current, high-energy electron and positron beams required to continue the development of beam-driven plasma wakefield acceleration.

FACET meets the Department of Energy Mission Need Statement for an Advanced Plasma Acceleration Facility and its program will achieve several key steps on the roadmap to a plasma wakefield linear collider and will sustain US leadership in accelerator physics.
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 our usual proposal process 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.

FACET Beam Time Allocation

There are roughly four months of beam time per year and the beam time will be allocated between a Plasma Wakefield Acceleration program and a general Beam Physics research program. Approved experiments will be allocated beam time during blocks when the beam is in an appropriate configuration for the experiment.
Proposals submitted to FACET are peer reviewed by the SLAC Accelerator Research Program Advisory Committee. 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.



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