A high-average power free-electron laser driven by a superconducting linac
has been developed in Japan Atomic Energy Research Institute (JAERI), and s
table laser output over 0.1 kW in infrared region is now available. For fur
ther increasing of FEL output power, installing energy-recovery transport h
its been planned. The lattice design for the energy-recovery transport is d
iscussed in the present paper. It is found that a recirculation transport,
which fulfills the requirements for energy acceptance and isochronicity, ca
n be realized by adding another triple-bend are to the existing beam line.
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