Abstract:
Background Energy recovery linac (ERL) is a promising route for delivering high-brightness, high-average-power electron beams efficiently, reliably and in a compact set-up. In a conventional ERL architecture, the recirculated beam transfers its energy back to the field power for accelerating subsequent beams. The required output power of the radio frequency (RF) source is significantly decreased. Moreover, the recirculated beam is usually decelerated below 10 MeV, the heat load and the radiation of the beam dump are also reduced. Owing to these advantages, great interest has been focused on ERLs for developing high-average-power free electron lasers, large particle colliders as well as extreme ultraviolet lithography light source. The infrared-terahertz free electron laser facility is the first ERL facility built in China.
Purpose This facility aims to investigate ERL-related beam physics and realize electron beam recirculation without FEL lasing.
Methods Initial beam commissioning was performed under the following operating conditions: macropulse current 1 mA, macropulse duration 500 μs, macropulse repetition frequency 1 Hz and micropulse repetition frequency 27.08 MHz.
Results The electron beam was successfully recirculated from 20 MeV to 7 MeV with an energy recovery efficiency of 99%.
Conclusions This achievement demonstrated the first realization of electron energy recovery in China.
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