title: Spontaneous emission and spectral properties of radiation by relativistic electrons in a gyro-klystron and optical-klystron undulator.
abstract: In this paper spontaneous emission of radiation by relativistic electrons in a gyro-klystron is studied. The scheme consists of two solenoid sections separated by a dispersive section. In the dispersive section the electrons are made non-resonant with the radiation. The dispersive section transforms a small change of the velocity into changes of the phases of the electrons. This leads to enhanced radiation due to klystron-type modulation as compared with a conventional gyrotron-type device driven by cyclotron maser interaction. It is shown that the klystron-modulated spectrum depends on the dispersive field strength, finite perpendicular velocity component and length of the solenoids but is independent of the axial magnetic field strength. A simple scheme to design a gyro-klystron is discussed.
authors.affiliation: Insertion Device Development Laboratory, Department of Physics, Devi Ahilya University, Indore, Madhya Pradesh 452001, India.
authors.forename: Bramha
authors.initials: B
authors.lastname: Prakash
authors.affiliation: Insertion Device Development Laboratory, Department of Physics, Devi Ahilya University, Indore, Madhya Pradesh 452001, India.
authors.forename: Ganeswar
authors.initials: G
authors.lastname: Mishra
authors.affiliation: Insertion Device Development Laboratory, Department of Physics, Devi Ahilya University, Indore, Madhya Pradesh 452001, India.
authors.forename: Roma
authors.initials: R
authors.lastname: Khullar
keywords: gyrotron; klystron; undulator; undulator radiation