Beam transport design for a recirculating-linac FEL driver Page: 2 of 17
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The CEBAF Industrial FEL Demo  is planned as a prototype and test bed for future high-
power, high-efficiency, industrial-use FELs. It requires tuneable beam energies up to -200 MeV, with
beam powers of- MW and peak currents of-200A Future practical applications will require cost-
effectiveness and energy-efficiency, and we incorporate into the Demo design features with these goals:
multipass acceleration, which reduces the accelerator structure hardware for minimal total construction
costs, and energy-recovery deceleration, which reduces the input power demands of the system.
Table 1 summarizes the requirements of the FEL Demo driver accelerator. For these
requirements we have designed the accelerator system shown in Figure 1, and it consists of a 10 MeV
photocathode-based injector, a 96 MV CEBAF-style SRF linac, and a two-pass recirculation transport.
This system accelerates the beam from the injector through two passes of the linac to 200 MeV. The
beam is then compressed and matched into the FEL wiggler, where it loses energy and greatly
increases its energy spread while producing coherent light. The resulting beam is decompressed,
returned into the linac, decelerated for energy recovery through two passes to -10 MeV, and then
transferred into the dump. This two-pass design is a minimal configuration needed to demonstrate
both recirculation and energy recovery, key features essential for future cost and energy efficient FEL
In this paper we discuss the beam transport system for the Demo, which is itself a prototype for
multi-pass energy-recovery transport systems, and addresses the major difficulties in such systems. For
both passes of the Demo we require tuneable, nearly-isochronous, large-momentum-acceptance
transport systems, with preservation of beam quality, and low-beam-loss (high acceptance) throughout
the system. In the following section we discuss the transport design considerations. This is followed by
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Neuffer, D.; Douglas, D.; Li, Z.; Cornacchia, M. & Garren, A. Beam transport design for a recirculating-linac FEL driver, report, July 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc668111/m1/2/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.