PERLE. Powerful energy recovery linac for experiments. Conceptual design report
2017
A conceptual design is presented of a novel ERL facility for the development and application
of the energy recovery technique to linear electron accelerators in the multi-turn, large
current and large energy regime. The main characteristics of the powerful energy recovery
linac experiment facility (PERLE) are derived from the design of the Large Hadron electron
Collider, an electron beam upgrade under study for the LHC, for which it would be the
key demonstrator. PERLE is thus projected as a facility to investigate efficient, high current
(g10 mA) ERL operation with three re-circulation passages through newly designed
SCRF cavities, at 801:58MHz frequency, and following deceleration over another three
re-circulations. In its fully equipped configuration, PERLE provides an electron beam
of approximately 1 GeV energy. A physics programme possibly associated with PERLE
is sketched, consisting of high precision elastic electron-proton scattering experiments,
as well as photo-nuclear reactions of unprecedented intensities with up to 30MeV photon
beam energy as may be obtained using Fabry-Perot cavities. The facility has further
applications as a general technology test bed that can investigate and validate novel superconducting
magnets (beam induced quench tests) and superconducting RF structures
(structure tests with high current beams, beam loading and transients). Besides a chapter
on operation aspects, the report contains detailed considerations on the choices for the
SCRF structure, optics and lattice design, solutions for arc magnets, source and injector
and on further essential components. A suitable configuration derived from the here presented
design concept may next be moved forward to a technical design and possibly be
built by an international collaboration which is being established.
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