• A. Gurinovich, V.G. Baryshevsky, N.A. Belous, V.A. Evdokimov, E.A. Gurnevich, P.V. Molchanov
  Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk

Volume Free Electron Laser (VFEL) is a peculiar kind of radiation generators using volume multi-wave distributed feedback*. Recent years applications of a “grid” photonic crystal (crystal-like artificial periodic structure) as a volume resonator for VFEL operation are intensively studied. Theoretical analysis** shows that a periodic metal grid does not absorb electromagnetic radiation and the ''grid'' photonic crystal, made of metal threads, is almost transparent for electromagnetic waves within the frequency range from GHz to THz. Operation of Volume Free Electron Laser with a photonic crystal formed by thin metallic threads periodically strained inside a waveguide*** confirmed the above conclusions. In the present paper operation of Volume Free Electron Laser with the photonic crystal built from brass foils strained inside a cylindrical waveguide is discussed. Dependence of radiation yield on the crystal length is studied in the range up to 8 GHz. Experimental results are compared with those obtained for the photonic crystal formed by threads.

* V.Baryshevsky, NIM A445 (2000) 281; LANL e-print archive physics/9806039.
** V.Baryshevsky, A.Gurinovich, NIM B252(2006)92.
*** V.Baryshevsky, N.Belous, A.Gurinovich et al,FEL'06,TUPPH012,p.331