Abstract
A new type of dielectric-loaded waveguide, the high-gradient dielectric-loaded waveguide (HG-DLW), where the Cherenkov radiation with a high gradient can be excited by relativistic electron, is proposed in this paper. Based on the simulation results, the process of the high-gradient Cherenkov radiation excited in the proposed structure is studied in details, and the amplitude of wakefields excited in proposed structure can be enhanced by over six times compared with that from ordinary dielectric-loaded waveguides.
Highlights
In recent years, dielectric-loaded waveguides (DLW), which can produce Cherenkov radiation with a narrow band when the relativistic electron passes, have generated extensive interest due to their wide applicability in various fields, including terahertz radiation sources [1,2,3], charged particle acceleration [4,5,6], beam-shaping and -bunching [7,8,9,10], and beam measurement [11]
To validate the statement that the excited wakefield inside high-gradient dielectric-loaded waveguide (HG-DLW) is enhanced, numerical simulations were performed by applying the wakefield solver of a 3D electromagnetic code CST particle studio [19]
The processes with which electron bunches pass through the HG-DLW and DLW are shown in Figure 3, and the remained parameters of HG-DLW were selected as tan(α) = 0.05, L = 30 mm, s = 1 mm
Summary
Dielectric-loaded waveguides (DLW), which can produce Cherenkov radiation with a narrow band when the relativistic electron passes, have generated extensive interest due to their wide applicability in various fields, including terahertz radiation sources [1,2,3], charged particle acceleration [4,5,6], beam-shaping and -bunching [7,8,9,10], and beam measurement [11]. The ramped electron bunch was applied to excite the high-gradient Cherenkov radiation by enhancing the energy-transmission ratio [14]. It can produce the higher-gradient wakefield without changing the electron beam and dielectric layer. Over six times improvement was achieved and it was shown that this new type of DLW could be applied to generate high-gradient Cherenkov radiation
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