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Popov, Yu.A.

Paper Title Page
MOPE046 Coherent Cherenkov Radiation from a Short bunch Passing near a Target and Possibility of a Bunch Length Diagnostics 1074
 
  • A. Potylitsyn, S.Yu. Gogolev, D.V. Karlovets, Yu.A. Popov, L.G. Sukhikh
    TPU, Tomsk
  • G.A. Naumenko, M.V. Shevelev
    Tomsk Polytechnic University, Nuclear Physics Institute, Tomsk
  
 

A non­in­va­sive tech­nique to de­ter­mine a sub-mm length of elec­tron bunch­es (rms < 100 um) based on a mea­sure­ment of the co­her­ent Cherenkov ra­di­a­tion (CChR) spec­trum in THz range is pro­posed. CChR is gen­er­at­ed when elec­tron bunch moves in a vac­u­um near di­elec­tric tar­get. If the op­ti­cal prop­er­ties and ge­om­e­try of a tar­get are cho­sen in order to achieve a low ab­sorp­tion with a dis­per­sion al­low­ing ex­pand­ing the Cherenkov cone, such tar­get may be con­sid­ered as the «nat­u­ral Cherenkov prism». We demon­strat­ed a fea­si­bil­i­ty of using of CsI prism for mea­sure­ment of a bunch length in the range 50-200 um for Lorentz fac­tor = 100. We also mea­sured CChR power from Teflon tar­get gen­er­at­ed by the 6.1 MeV bunched elec­tron beam with bunch rms length 1.2 mm and com­pared it with co­her­ent diffrac­tion ra­di­a­tion one for iden­ti­cal con­di­tions. CChR seems to be a promis­ing ra­di­a­tion mech­a­nism for a new beam di­ag­nos­tics tech­nique.