Charged particles accelerator apparatus, charged particle gun and method of accelerating charged particles

A method of accelerating charged particles comprising the steps of:

• (a) providing an accelerator apparatus being configured for accelerating charged particles with pulsed radiation, comprising:
• (i) a horn-shaped coupling device with at least one horn coupler having an input aperture, electrically conductive walls and an output aperture and being configured for receiving the pulsed radiation at the input aperture and focusing the pulsed radiation along a longitudinal beam direction towards the output aperture, and
• (ii) a waveguide device coupled with the output aperture of the at least one horn coupler being configured for receiving the pulsed radiation focused by the horn-shaped coupling device, wherein
• (iii) the waveguide device includes an injection section being configured for providing a bunch of charged particles and for subjecting the charged particles to an acceleration by the pulsed radiation in the injection section, and
• (iv) the waveguide device includes a lateral output port being arranged at the injection section for releasing the accelerated charged particles along a particle acceleration direction, wherein
• (v) the at least one horn coupler is configured for receiving linearly polarized single cycle pulses including a broadband frequency spectrum and being shaped as a linearly polarized plane wave and for focusing the linearly polarized single cycle pulses, and
• (vi) the waveguide device has a non-resonant broadband transmission characteristic,
• (b) providing at least one focused linearly polarized single cycle pulse in the injection section of the waveguide device,
• (c) providing at least one bunch of charged particles in the injection section, and
• (d) subjecting the at least one bunch of charged particles to an acceleration by an effect of a leading edge of the at least one focused single cycle pulse.