High-frequency focusing device for focusing a beam of charged particles accelerated within a cyclotron
AssigneeC.G.R. MeV
InventorsDuc Tien Tran, Jacques Kervizic, Bernard Hurt
Life of this patent
Estimating the term…
Abstract
A high-frequency focusing device making it possible to achieve suitable horizontal and vertical focusing of a beam of charged particles issued from a particle source located substantially at the center of a cyclotron, this device comprising pairs of focusing electrodes fixed to the edges of parallel plates forming each sector-shaped Dees of the cyclotron, each pair of electrodes being arranged in such a manner that the particle beam passes between them, these electrodes which project into the acceleration space e of the cyclotron, making it possible to compensate for lack or excessive vertical focusing brought about by the magnetic field developed in the acceleration space e.
Claims7
A high-frequency focusing device for a beam of charged particles accelerated in an accelerator of cyclotron type, said accelerator comprising a particle source, at least two accelerating electrodes or "Dee's" provided with two plates parallel to the plane of the trajectory followed by said beam and arranged between the pole pieces of an electro-magnet furnishing a magnetic field of a predetermined value, means for creating a high-frequency electric field between said electrodes, said high-frequency focusing device comprising at least one pair of metal focusing electrodes attached to one of the "Dee's" in the neighbourhood of said source, said focusing electrodes projecting into the accelerator space defined between the "Dee's", said focusing electrodes being arranged in such a manner that they are disposed to either side of one of the approximately circular trajectories followed by the particle beam during the course of one of it's first revolutions.
Dependencies are inferred from the claim text.