It is well known that high frequency fields can be used to create different structures in a plasma medium. Now this application of electromagnetic waves can be considered as one of the directions in plasma physics. Structures with specific properties are created in certain places of a plasma medium furnished to achieve defined effects, that are important for some applications. Intricate processes are used in a CERA-A (Cyclotron Electron Resonance Applications-Accelerator) device, which was constructed for plasma flow acceleration. To create a wider accelerated ion flow a CERA-V (V-variable ion energy) device was made, where in-phase electron plasma oscillations in a narrow layer of a plasma column were used. © 1999 IEEE.