Electrodynamic System of the Linear Induction Accelerator Module

This article presents the results of theoretical and experimental studies on the electrodynamic system of an accelerator module, which is a part of the linear induction accelerator (LIA) (BINP and RFNC-VNIITF). In the course of this research, 3-D models of the LIA accelerator module with the geometry close to the real one have been created. These models allowed us to calculate the main parameters of the electromagnetic eigenmodes for these modules. To verify the calculation results, an experimental stand permitting to register the spectral properties of the dipole modes has been built. The main results of the work are the electromagnetic field distributions of the modes in the accelerator module obtained in modeling, as well as the mode spectra calculated and registered in “cold” experiments (without beam). Based on the obtained data, the main features of the oscillation's spectral composition and their Q-factors have been established in the frequency range f ≈ 300-1100 MHz, and the effective methods for suppressing these oscillations have been proposed. The development of such methods is absolutely necessary in order to reduce the increment of the beam breakup (BBU) instability, which is the main obstacle in the increase of the beam current in LIA.