Abstract:
An electron accelerator comprising a resonant cavity, an electron source, an RF system, and at least one magnet unit is provided. The resonant cavity further comprises a hollow closed conductor and the electron source is configured to radially inject a beam of electrons into the cavity. The RF system is configured to generate an electric field to accelerate the electrons along radial trajectories. The at least one magnet unit further comprises a deflecting magnet configured to generate a magnetic field that deflects an electron beam emerging out of the resonant cavity along a first radial trajectory and redirects the electron beam into the resonant cavity along a second radial trajectory. The resonant cavity further comprises a first half shell, a second half shell, and a central ring element.
Abstract:
Disclosed embodiments include an electron accelerator, having a resonant cavity having an outer conductor and an inner conductor; an electron source configured to generate and to inject a beam of electrons transversally into the resonant cavity; a radio frequency (RF) source coupled to the resonant cavity and configured to: energize the resonant cavity with an RF power at a nominal RF frequency, and generate an electric field into said resonant cavity that accelerates the electrons of the electron beam a plurality of times into the cavity and according to successive and different transversal trajectories; and at least one deflecting magnet configured to bend back the electron beam that emerges out of the cavity and to redirect the electron beam towards the cavity.
Abstract:
A device for accelerating and storing charged particles of the present invention comprises a vacuum duct which has two opposite linear portions and two opposite curved portions respectively connected to the linear portions and which functions to maintain the orbit of revolution of the charged particles in a vacuum; an accelerating device for accelerating charged particles which is disposed on the orbit of the charged particles; a pair of bending magnets which are respectively disposed on the curved portions of the vacuum duct; and a pair of quadrupole electromagnets which are respectively disposed on the linear portions of the vacuum duct and at least one of which is disposed at a position at a given distance from the center of the corresponding linear portion.
Abstract:
A vario-energy electron accelerator includes a resonant cavity consisting of a closed conductor, an electron source injecting a beam of electrons into the resonant cavity, an RF system coupled to the resonant cavity and generating an electric field in the resonant cavity, magnet units centred on a mid-plane and generating a field in a deflecting chamber in fluid communication with the resonant cavity, the magnetic field deflecting along a first deflecting trajectory of adding length an electron beam exiting the resonant cavity along a first radial trajectory to reintroduce it into the resonant cavity along a second radial trajectory, an outlet for extracting along an extraction path an accelerated electron beam from the resonant cavity towards a target, wherein at least one of the magnet units is adapted for modifying the first deflecting trajectory to a second deflecting trajectory, allowing a variation of the energy of the electron beam.
Abstract:
A radio-frequency (RF) cavity apparatus for accelerating charged particles includes first and second cavity arms. The first and second cavity arms have respective first and second axes of rotational symmetry and each cavity arm includes at least one cell. The first and second cavity arms are connected by a resonance coupler. The cell(s) of the first cavity arm have an axial dimensional parameter that is equal to a corresponding axial dimensional parameter of the cell(s) of the second cavity arm, and the cell(s) of the first cavity arm have at least one non-axial dimensional parameter that differs from corresponding non-axial dimensional parameter(s) of the cell(s) of the second cavity arm.
Abstract:
A multi-energy cargo inspection system features a compact electron accelerator is used that is more compact, more efficient and less expensive than a single linear accelerator with the same energy. The system has enhanced capabilities to recognize the elemental content of a container which can be used to detect concealed explosive and fissionable materials.
Abstract:
A magnetic field apparatus for a particle accelerator having a particle track having curved sections contains several magnetic field-generating windings, and at least one supplemental winding provided for focusing the electrically charged particles. The system does not require pre-accelerators and relatively large particle streams should be capable of being accelerated nevertheless to relatively high energy levels. In the region of at least one of the curved sections of the particle track, an azimuthal guiding field for the particles is generated by the supplemental winding during the acceleration phase. This supplemental winding is designed as an appropriately curved electric conductor arrangement which in part encloses the particle track and which is designed in the manner of a hollow channel open toward the outside. The conductor arrangement is appropriately structured for suppressing eddy currents and carries a current transversely to the particle track.
Abstract:
Embodiments of systems, devices, and methods relate to initiating beam transport for an accelerator system. An example method includes increasing a bias voltage of one or more electrodes of the accelerator system to a first voltage level and extracting a charged particle beam from a beam source such that the beam is transported through the accelerator system. The beam has a beam current that results in a first transient voltage drop within a threshold. The method further includes increasing the beam current at a rate that results in one or more subsequent transient voltage drops within the threshold until the accelerator system has reached nominal conditions. Another example method includes biasing one or more electrodes of an accelerator system and selectively extracting, according to a duty cycle function, a charged particle beam from a beam source such that the charged particle beam is transported through the accelerator system.
Abstract:
A linear accelerator comprises a plurality of cyclotrons arranged axially in a cyclotron stack, each cyclotron having a set of dees and a central aperture passing through the set of dees. Each central aperture is axially aligned with one another in the stack, forming a central channel having an inlet and an outlet that passes through the stack. Magnets are positioned so as to generate a magnetic field perpendicular to the set of dees. A power supply applies an oscillating voltage to each set of dees of the stack. In operation, subatomic particles are ejected radially outwardly of the stack, creating a dead zone within the central channel that is void of particles and electromagnetic fields. A mass or light beam is accelerated as it passes through the central channel's dead zone, due to the absence of frictional forces acting on the mass or light within the dead zone.