Author: Vorobev, V.V.
Paper Title Page
TUPAB249 Diffraction at the Open-Ended Dielectric-Loaded Circular Waveguide 2033
 
  • S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev
    Saint Petersburg State University, Saint Petersburg, Russia
 
  Funding: Work supported by Russian Science Foundation (Grant No. 18-72-10137).
Con­tem­po­rary beam and THz tech­nolo­gies are tightly in­ter­laced dur­ing last years. Strong THz fields allow re­al­iza­tion of THz dri­ven elec­tron guns, THz bunch com­pres­sion, streak­ing* and THz dri­ven wake­field ac­cel­er­a­tion**. In­versely, di­elec­tric cap­il­lar­ies sim­i­lar to those used for THz bunch ma­nip­u­la­tion can be in turn uti­lized for de­vel­op­ment of high-power nar­row-band THz sources***. Men­tioned cases in­volve in­ter­ac­tion of THz waves and par­ti­cle bunches with an open end of cer­tain di­elec­tric loaded wave­guide struc­ture, most fre­quently a cir­cu­lar cap­il­lary. For fur­ther de­vel­op­ment of the dis­cussed prospec­tive top­ics a rig­or­ous ap­proach al­low­ing an­a­lyt­i­cal in­ves­ti­ga­tion of both ra­di­a­tion from open-ended cap­il­lar­ies and their ex­ci­ta­tion by ex­ter­nal source would be ex­tremely use­ful. We pre­sent an el­e­gant and ef­fi­cient rig­or­ous method for solv­ing cir­cu­lar open-ended di­elec­tric-loaded wave­guide dif­frac­tion prob­lems based on Wiener-Hopf tech­nique. We deal with the case of uni­form di­elec­tric load­ing and in­ter­nal ex­ci­ta­tion by a wave­guide mode. S-pa­ra­me­ters, near-field and far-field dis­tri­b­u­tions are pre­sented. The ob­tained re­sults can be also ap­plied to the nar­row band wake­field.
* L. Zhao et al., Phys. Rev. Lett., 124, 054802 (2020).
** M.T. Hibberd et al., Nat. Photonics, 14, 755-759 (2020).
*** D. Wang et al., Rev. Sci. Instr., 89(9), 093301 (2018).
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB249  
About • paper received ※ 19 May 2021       paper accepted ※ 21 June 2021       issue date ※ 21 August 2021  
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