Cherenkov radiation in a surface wave accelerator based on silicon carbide (SWABSiC) | Zendy

Tianhong Wang | Zendy; Kueifu Lai | Zendy; Vladimir Khudik | Zendy; Gennady Shvets | Zendy

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Cherenkov radiation in a surface wave accelerator based on silicon carbide (SWABSiC)

Author(s) -

Tianhong Wang,

Kueifu Lai,

Vladimir Khudik,

Gennady Shvets

Publication year - 2017

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.4975884

Subject(s) - cherenkov radiation , physics , electron , optics , waveguide , polariton , silicon carbide , relativistic electron beam , cathode ray , materials science , nuclear physics , detector , metallurgy

We report on theoretical investigations of Cherenkov-type emission of surface phonon polaritons (SPhPs) by relativistic electron bunches. The polaritons are confined by a planar waveguide comprised of two SiC slabs separated by a vacuum gap. The SPhPs are generated in the reststrahlen band, where the dielectric permittivity of SiC is negative. Two surface modes are analyzed: the accelerating (symmetric) and the deflecting (anti-symmetric) wakes. Both form Cherenkov cones that exhibit rapid spatial oscillations and beats behind the moving charge. Moreover, the accelerating mode forms a reversed Cherenkov radiation cone due the negative group velocity for sufficiently small gaps. The wakefield acceleration of electron bunches inside the structure is also discussed, as well as our recent experimental progress in propagating the electron beam through the structure at the Advanced Test Facility (ATF) that resulted in > 12% beam transmission.

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