APPARATUS FOR GHz RATE HIGH DUTY CYCLE PULSING AND MANIPULATION OF LOW AND MEDIUM ENERGY DC ELECTRON BEAMS

摘要

An ElectroMagnetic-Mechanical Pulser can generate electron pulses at rates up to 50 GHz, energies up to 1 MeV, duty cycles up to 10%, and pulse widths between 100 fs and 10 ps. A modulating Transverse Deflecting Cavity (“TDC”) imposes a transverse modulation on a continuous electron beam, which is then chopped into pulses by an adjustable Chopping Collimating Aperture. Pulse dispersion due to the modulating TDC is minimized by a suppressing section comprising a plurality of additional TDC's and/or magnetic quadrupoles. In embodiments the suppression section includes a magnetic quadrupole and a TDC followed by four additional magnetic quadrupoles. The TDC's can be single-cell or triple-cell. A fundamental frequency of at least one TDC can be tuned by literally or virtually adjusting its volume. TDC's can be filled with vacuum, air, or a dielectric or ferroelectric material. Embodiments are easily switchable between passive, continuous mode and active pulsed mode.

主权项

1. A combined ElectroMagnetic-Mechanical Pulser (“EMMP”) comprising:
an input configured to accept input of a continuous electron beam; a first Transverse Deflecting Cavity (“TDC”) downstream of the input and configured to impose an oscillatory transverse deflection on the electron beam according to at least one of a time-varying electric field and a time-varying magnetic field generated within the first TDC; a Chopping Collimating Aperture (“CCA”) downstream of the first TDC and configured to block the electron beam when its deflection exceeds a threshold maximum or minimum, thereby chopping the electron beam into a stream of electron pulses having an electron pulse repetition rate; a dispersion suppressing section downstream of the CCA and configured to suppress a residual dispersion of the stream of electron pulses arising from the deflection imposed by the first TDC, the dispersion suppressing section including at least two elements selected from the group comprising TDC's and magnetic quadrupoles; and an output downstream of the dispersion suppressing section and configured to allow the stream of electron pulses to emerge from the EMMP.