Electron acceleration by vpxB scheme

A new type electron linear accelerator, based on vpxB acceleration mechanism observed originally in plasma, has been demonstrated in vacuum. In this scheme a static magnetic field is applied vertically to the wave propagating direction and the particles are accelerated along the wave front at constant phase with respect to the wave. The linac consists of electron gun, magnetron for a RF source, slow wave structure and a pair of coil for an applied magnetic field. Energy gain of 12.8 keV is observed at an initial energy of 66 keV when an external magnetic field of 2.5 G is applied. The energy gain is 30 % higher than that of a conventional linac. The output energy increment is proportional to the square of the applied magnetic field Bo. Experiments have been carried out with two different RF power levels in order to examine a trapping condition of the vpxB scheme, which depends on the wave electric field and the applied magnetic field. The comparisons between the experimental and theoretical values are given. (author)