• Coherent and incoherent radiation from free-electron lasers with an axial guide field 

      Freund, Henry P.; Sprangle, P.; Dillenburg, Darcy; Jornada, Eda Homrich da; Liberman, Bernardo; Schneider, Ruth de Souza (1981) [Artículo de periódico]
      The spontaneous and induced emission from a free-electron laser is treated for the case in which an axial magnetic field is imposed in addition to the helical, axially periodic wiggler magnetic field. The classes of possible ...
    • Collective effects on the operation of free-eletron lasers with an axial guide field 

      Freund, Henry P.; Sprangle, P.; Dillenburg, Darcy; Jornada, Eda Homrich da; Schneider, Ruth de Souza; Liberman, Bernardo (1982) [Artículo de periódico]
      The collective interaction in a free-electroii laser with combined helical wiggler and uniform axial guide fields is presented in the linearized regime. The analysis involves a perturbation of the Vlasov-Maxwell equations ...