Abstract
We propose a new type of axisymmetric dielectric target which effectively concentrates Cherenkov radiation (CR) generated in the bulk of the material into a small vicinity of focus point. It can be called the "axicon-based concentrator for CR". A theoretical investigation of radiation field produced by a charge moving through the discussed radiator is performed for the general case where a charge trajectory is shifted with respect to the structure axis. The idea of dielectric target with specific profile of the outer surface was presented and developed in our preceeding papers. However, contrary to the previous configuration of such a target (which was investigated for both centered and shifted charge trajectory), the current version allows efficient concentration of CR energy from relativistic particles, making this device extremely prospective for various applications.
Highlights
INTRODUCTIONElectromagnetic radiation emerging during an interaction between charged particle beams and various structures (homogeneous media, periodic structures etc.) were widely used for decades in various applications
Electromagnetic radiation emerging during an interaction between charged particle beams and various structures were widely used for decades in various applications
Cherenkov radiation (CR) was intensively studied in various contexts, while the most recent between them are dielectric wakefield acceleration [6,7,8], bunch size measurement [9,10,11], and contemporary sources of radiation, including those for terahertz (THz) frequencies [12,13,14,15,16,17,18]
Summary
Electromagnetic radiation emerging during an interaction between charged particle beams and various structures (homogeneous media, periodic structures etc.) were widely used for decades in various applications. Radially polarized laser beams are extensively studied in recent years due to their unique properties (for example, a smaller focal spot size compared to linearly or circularly polarized light, including even subdiffraction focal spot) [29,30,31] and prospective applications, including laser particle acceleration in vacuum [32,33,34] In this context, the discussed “axicon-based concentrator for CR” becomes even more prospective since it allows the implementation of mentioned attractive phenomena to CR from relativistic bunches produced by modern accelerators
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