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J. Seeman et al.
7.8.7 PERLE
PERLE (Powerful ERL for Experiments) is a novel ERL test facility [152] which
has been designed to validate choices for a 60 GeV ERL foreseen in the design
of the LHeC [153] and the FCC-eh. Its main thrust is to probe high current, CW,
multi-pass operation with superconducting cavities at 802 MHz (and perhaps other
frequencies of interest). With very high transient beam power (~10 MW), PERLE
offers an opportunity for controllable studies of every beam dynamic effect of
interest in the next generation of ERL design; PERLE will become a ‘stepping stone’
between present state-of-the-art 1 MW ERLs and future 100 MW scale applications.
PERLE design features a flexible momentum compaction lattice architecture in six
vertically stacked return arcs, and a high-current, 5 MeV photo-injector. With only
one pair of four-cavity cryomodules, 400 MeV beam energy will be reached in three
recirculation passes, with beam currents of appoximately 20 mA. The beam will be
decelerated in three consecutive passes back to the injection energy. Work on the
engineering design of PERLE has just begun as of summer 2019.
In summary, the next-generation ERLs under study or in construction in 2019
take performance to the next (10 MW) level, and include bERLinPro, CBETA, and
PERLE. These systems will provide the experience and knowledge base for fourthgeneration objective systems such as electron-ion collider electron coolers, XFEL
drivers, and high-energy colliders.
A more detailed comparison of present and next-generation systems is given in
Table 7.8 [154]. Certain characteristics of the next generation are apparent: not
only do projected beam powers climb by an order of magnitude as noted, but the
number of passes, the power multiplier, and the dynamic range all increase, and
both accelerated and recovered beams are transported in shared beamlines. All of
these features are natural evolutionary consequences of system design optimization
in the pursuit of higher performance with a lower cost.
J. Seeman et al.
7.8.7 PERLE
PERLE (Powerful ERL for Experiments) is a novel ERL test facility [152] which
has been designed to validate choices for a 60 GeV ERL foreseen in the design
of the LHeC [153] and the FCC-eh. Its main thrust is to probe high current, CW,
multi-pass operation with superconducting cavities at 802 MHz (and perhaps other
frequencies of interest). With very high transient beam power (~10 MW), PERLE
offers an opportunity for controllable studies of every beam dynamic effect of
interest in the next generation of ERL design; PERLE will become a ‘stepping stone’
between present state-of-the-art 1 MW ERLs and future 100 MW scale applications.
PERLE design features a flexible momentum compaction lattice architecture in six
vertically stacked return arcs, and a high-current, 5 MeV photo-injector. With only
one pair of four-cavity cryomodules, 400 MeV beam energy will be reached in three
recirculation passes, with beam currents of appoximately 20 mA. The beam will be
decelerated in three consecutive passes back to the injection energy. Work on the
engineering design of PERLE has just begun as of summer 2019.
In summary, the next-generation ERLs under study or in construction in 2019
take performance to the next (10 MW) level, and include bERLinPro, CBETA, and
PERLE. These systems will provide the experience and knowledge base for fourthgeneration objective systems such as electron-ion collider electron coolers, XFEL
drivers, and high-energy colliders.
A more detailed comparison of present and next-generation systems is given in
Table 7.8 [154]. Certain characteristics of the next generation are apparent: not
only do projected beam powers climb by an order of magnitude as noted, but the
number of passes, the power multiplier, and the dynamic range all increase, and
both accelerated and recovered beams are transported in shared beamlines. All of
these features are natural evolutionary consequences of system design optimization
in the pursuit of higher performance with a lower cost.