ABSTRACT
Experimental electrodynamic studies of accelerating structures are an important stage in the development of any accelerator of charged particles. The need for such studies stems from an insufficient accuracy of analytical and numerical techniques used to design accelerating cavities and from the desire to perfect the cavity technology. This chapter is devoted to the development of the bead-pulling technique and to its use in measurements of electrodynamic characteristics of accelerating cavities. The measurement techniques and circuits developed for this purpose are demonstrated using biperiodic structures and interdigital H-type cavities as examples. Direct measurements with single cells determine the resonance frequencies, and measurements with stacks of coupled cells yield dispersion curves in the fundamental and higher order modes. In deriving the dispersion equation of the structure, the resonance frequency is put in correspondence to the dimensions of the accelerating structure.
