Beam Dynamic Study of a Designed Accelerating Cavity for 6 MeV Linac

Abstract

Side coupled standing wave accelerating cavities are widely used in a low energy linear accelerator because of relatively high accelerating gradient and low sensitivity to construction tolerances. The effective interaction of particles and electromagnetic fields is important to accelerate electrons to the intended energy with the greatest efficiency and beam quality output. Beam dynamics study is essential for determining the coordinates of the output beam from the cavity. In this paper, we present the beam dynamics of a 6 MeV accelerating cavity using a space charge tracking algorithm (ASTRA). The designed accelerating cavity that feeds by magnetron with a maximum power of 3.2 MW is operating in π/2 mode at a frequency of 2856 MHz. The results show that after the construction of the designed cavity, the vertical and horizontal emittances of the output beam, the transverse profile and the beam energy spread respectively 3.55 pi-mm-mrad, 1 mm and 0.88 MeV as expected.

Keywords

• beam dynamics
• standing-wave accelerating cavity
• astra
• electromagnetic field and electron interaction