Optimizing Drift Tube Parameters in IH and SPR Structures

IH (Interdigital H-type) and SPR (split ring) structures are used to accelerate ions at low energies and relatively low operating frequencies. A procedure for selecting the parameters of drift tubes (DTs) is proposed to achieve high HF efficiency and simultaneously suppress the dipole parasitic component of electric fields at a given electrical strength. A database of DT variants based on six free geometric parameters is compiled using modern software in an electrostatic 3D approximation. The final variant is selected through sequential interpolation of the database. Fourier coefficients of the expansion of the accelerating field on its axis are also derived to calculate the particle dynamics in the selected DT variants.