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Linac optics of an energy recovery linac (ERL) is optimized to ensure the high average current electron beam to drive synchrotron light sources and free-electron lasers. Genetic algorithm is utilized to search globally optimum parameters of the linac optics. Multi-pass transverse beam-break-up (BBU) threshold current is estimated by numerical simulation with the optimized optics parameters. It is...
The free-electron laser (FEL) linac has been modified to the energy recovery linac (ERL) at the Japan Atomic Energy Research Institute (JAERI) to achieve the higher power FEL of the next stage of 5-10 kW. Energy recovery has been successfully demonstrated up to 5 mA of average current. Upgrade of the injector is in preparation to accelerate the higher average current of 40 mA. We review transverse...
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