Study on the dynamics during longitudinal compression of intense charged particle beams with a compact simulator

Longitudinal bunching is one of the critical techniques to achieve high-power charged particle beams. To investigate the compression process of intense beams, we constructed a compact simulator device composed of an electron gun, an induction modulator, and a solenoidal transport line. We conducted bunching experiment in a parameter region with electron particle density 1.6x10⁶/cm³ to 3.1x10⁷/cm³ at maximum compression. To results compared by 1D electrostatic Particle-In-Cell simulations. Through experimental results and numerical simulations, we confirmed the device is ready to discuss the bunching dynamics. In addition, we numerically extrapolated the beam bunching to the higher current. The results revealed our device has potential to discuss a dissipation process of charged particle beams during longitudinal compression. (author)