Experimental demonstration of dielectric structure based two beam acceleration

Abstract

Abstract. We reporton the experimental results of the dielectric baaed two beam accelerator (step-up transformer). By using a single high charge beam, we have generated and extracted a high power RF pulse from a 7.8 GHz primary dieketric structure and then subsequently transferred to a seeond accelerating structure with higher dieketric constant and smaller transverse dimensions. We have measvred the energy change of a seeond (witness) beam passing through the acceleration stage. The measured gradient is >4 times the deeekration gradient. The detailed experiment of set-up and results of the measurements are dimmed. Future plans for the development of a 100 MeV demonstration accelerator based on this technique is presented.

Survey of advanced dielectric wakefield accelerators

“…Figure 3 shows the mapping of the wakefield experienced by the witness bunch trailing the drive bunch in a collinear experiment [4]. Figure 4 illustrates the acceleration and deceleration of the witness beam in a TBA experiment, as measured by a magnetic spectrometer [5]. Although the wakefield experiments at AWA were very successful in demonstrating the feasibility of the wakefield acceleration schemes, the achieved accelerating gradients were relatively modest, reaching only approximately 15 MV/m in the collinear configuration and 7 MV/m in the TBA experiments.…”