Performance of an electron linear accelerator for the first photoneutron source in China
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A compact 15.0-MeV, 1.5-kW electron linear accelerator (LINAC) was successfully constructed to provide an electron beam for the first photoneutron source at the Shanghai Institute of Applied Physics, Shanghai, China. This LINAC consists of five main parts: a thermal cathode grid-controlled electron gun, a pre-buncher, a variable-phase-velocity buncher, a light-speed accelerating structure, and a high-power transportation beamline. A digital feedforward radio frequency compensator is adopted to reduce the energy spread caused by the transient beam loading effect. Furthermore, a real-time electron gun emission feedback algorithm is used to keep the beam stable. After months of efforts, all the beam parameters successfully met the requirements of the facility. In this paper, the beam commissioning process and performance of the LINAC are presented.
KeywordsElectron linear accelerator High-power transportation beamline Digital feedforward radio frequency compensation Real-time electron gun emission feedback algorithm Transmission efficiency
We would like to express our sincere thanks to SINAP members of the Department of Reactor Physics. We are also very grateful to the SINAP members of the Vacuum Group, Power Supply Group, Beam Instrumentation Group, Control Group, and Pulse Group for technical assistance.
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