Electron Linear Accelerator Based on the Crossed-Wave Electric and Static Magnetic Field

概要

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A new type of linear electron accelerator, based on the crossed-wave-electric field and static magnetic field system known as the v_p×B acceleration mechanism observed originally in plasma, has been demonstrated in vacuum for the first time. In this scheme a static magnetic field is applied vertically to direction of the wave propagation and the particles are accelerated along the wavefront in a constant phase with respect to the wave. The present machine can be either a conventional linear accelerator or a new type of v_p×B accelerator without any modification. An energy gain of 12.8 keV for electrons is observed from an incident energy of 66 keV in a 0.5 m accelerator when an external magnetic field of 2.5 G is applied. The energy gain is 30% higher than that of conventional linacs. The energy gain is proportional to the square of the applied magnetic field strength B_0 as long as the electrons are trapped within a wave trough. Experiments have been carried out with two different RF power levels in order to confirm the trapping condition for electrons, which depends on both the electric field and the applied magnetic field. The results of experiments and theories are in fairly good agreement.
社団法人応用物理学会の論文
1993-12-15