Abstract
The new traveling wave structure with a single synchronous mode resonantly excited by the relativistic charge is presented. The structure is composed of a metallic tube with an internally coated low conductive thin layer. It is shown that the impedance of the internally coated metallic tube has a narrow-band single resonance at a high frequency. The analytical presentation of the narrow-band impedance, the wake function, and the frequency of the synchronous mode are obtained. The analytical solutions are compared with exact numerical simulations using the field matching technique.
Highlights
The study of the new type of the slowly traveling wave structures is driven by the development of both novel coherent radiation sources [1,2,3,4] and advanced acceleration concepts [5,6,7,8,9]
The new traveling wave structure with single synchronous mode resonantly excited by the relativistic charge is presented
We show that the longitudinal impedance of the internally coated metallic tube (ICMT) under certain conditions has a narrow-band single resonance at a high frequency observed numerically in Refs. [18,19] using the exact field matching technique [11]
Summary
The study of the new type of the slowly traveling wave structures is driven by the development of both novel coherent radiation sources [1,2,3,4] and advanced acceleration concepts [5,6,7,8,9]. The structure with a single slow traveling wave has special interest, as the relativistic charge will excite the synchronous mode only. The single slow wave structure is an attractive candidate for particle acceleration due to the absence of high order propagating modes. Such a structure may effectively support the high transformer ratio single-modebased wake field accelerator schemes with linear ramped single- [14] and multibunch driver beams [15,16,17]. The new traveling wave structure with single synchronous mode resonantly excited by the relativistic charge is presented. The analytical results are compared with numerical simulations using the field matching technique
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