Studies of Synchrotron Radiation Emission from the NRL Modified Betatron Accelerator
NAVAL RESEARCH LAB WASHINGTON DC
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Numerical calculations of synchrotron radiation emitted from the NRL modified betatron accelerator show that, for relativistic electron energies up to approximately 2 MeV, the single particle intensity spectrum is characterized by a peak at the Doppler-shifted cyclotron frequency associated with applied toroidal field. Measurements of the radiation using fixed-frequency heterodyne receivers indicate that the polarization, amplitude, and the temporal evolution of radiated power during acceleration are in very good agreement with the predicted single particle spectrum. The observations have been used to confirm the energy evolution and provide information about the magnitude of the transverse velocity of the beam electrons for the first few hundred microseconds of acceleration. Late-time signal decay suggests that electrons are moving off the minor axis in a manner that is consistent with the excitation of the electron-cyclotron resonance.
- Nuclear Physics and Elementary Particle Physics