Abstract: Sub-nanosecond single ion beam pulses are generated by means of one embodiment of the invention. In this embodiment, an ion source provides ions to a radio frequency quadrupole linear accelerator comprising electrodes. A power source is used to apply radio frequency alternating currents to the electrodes. A device is used to inject ions from the ion source to the accelerator, causing the accelerator to provide only a single sub-nanosecond output beam pulse at a time.

Abstract: A radioisotope production apparatus includes: a linear accelerator for accelerating an ion beam and irradiating a target with the ion beam, radio frequency power supplies for supplying radio frequency waves through coaxial tubes and the linear accelerator, a target shield member containing the target, a first radiation shield member covering the linear accelerator, and a movable second radiation shield member covering the side of target shield member of the linear accelerator between the first radiation shield member and the target shield member. The first radiation shield member is movably divided in opposite directions, respectively, of the axial direction of the linear accelerator from the base point of the connection point of the coaxial tube connected to the linear accelerator.

Abstract: A compact proton-beam therapy linac utilizing a linear, cascaded organization including a proton source, a radio-frequency-quadrupole (RFQ) linac coupled to the output of the source, a stepped-frequency (around 500- to around 100-MHz), low-peak-beam-current (around 100- to around 300-.mu. A) drift-tube linac (DTL) coupled to receive the output of the RFQ, and a plural-stage, low-peak-beam-current stage-switchable, side-coupled linac (SCL) coupled to the output of the DTL for producing the ultimate output proton-therapy beam.

Abstract: A variable frequency RFQ linear accelerator has a sequence of variable inductance coils connected at intervals along the electrode vanes, such that each coil together with the corresponding section of the vanes forms an LC resonant circuit having a resonant frequency equal to the operating frequency of the accelerator. The variable inductance coils are each comprised of a helical bifilar coil, with each filament of a given coil being connected to one pair of vane electrodes on opposite sides of the beam axis, and a movable shorting bar is provided for each bifilar coil to vary the inductance. The helical bifilar coils in adjacent sections are disposed on opposite sides of the beam axis, the axes of the coils on either side being parallel to the beam axis and mutually coincident.