A Heavy Ion Synchrotron

Abstract

A heavy ion synchroaccelerator comprises an annular vacuum pipeline, the annular vacuum pipeline has a plurality of linear ion beam sections and a plurality of curve ion beam sections, the linear ionbeam sections and the curve ion beam sections are alternately arranged, heavy ions are injected from a first linear ion beam section and are led out from another linear ion beam section, each curve ion beam section comprises one first dipole magnet and one second dipole magnet which are connected in series, the heavy ions are moved from the first dipole magnets to the second dipole magnets, vertical correcting magnets and vertical focusing quadrupole magnets are arranged in order between the first dipole magnets and the second dipole magnets, the linear ion beam sections at the downstreams ofthe second dipole magnets are provided with horizontal correcting magnets, hexapole magnets and horizontal correcting quadrupole magnets in order. The heavy ion synchroaccelerator is simple in structure, can save processing cost, facilitate installation and debugging of the device, is easier to achieve high accumulation flow intensity, and can fully utilize transverse acceptability of the synchroaccelerator.

Description

technical field [0001] The invention relates to the field of synchrotrons, in particular to a heavy ion synchrotron with a FODO structure. Background technique [0002] Because the irradiation of heavy ion beams on organisms has the characteristics of inverted depth dose distribution, small side scatter, high relative biological effect and low oxygen increase ratio, etc., making heavy ion cancer treatment has become an advanced technology in the world today. Effective radiation therapy for cancer. The beam energy of the commonly used deep heavy ion cancer therapy is 120MeV / u-400MeV / u. [0003] A synchrotron is a device that injects, accelerates, and extracts charged particle beams by controlling the timing structure of the front-end injector, the magnetic field of the synchrotron magnet, the longitudinal high-frequency electric field, the beam diagnosis element, and the injection element. It is widely used in the fields of nuclear physics, nuclear physics, material irradia...

AI Technical Summary

Problems solved by technology

Among them, 201210264179.2 is very suitable for proton cancer treatment accelerators. Although it is suitable for heavy ion cancer treatment accelerators, due to the structure of 6 two-pole magnets, a single two-pole magnet weighs 20 tons and has a bending arc of 60 degrees. It is convenient for the processing of the magnet, but also brings difficulty to the installation of the magnet; and the patent 201010252492.5 uses eight 45-degree deflection dipole magnets, and uses a cyclotron as the injector, so it is difficult to achieve a higher beam current intensity. lead to longer treatment times

In addition, due to the large deflection angle of the beam at the point where the beam is drawn out of the electrostatic cutter relative to the central orbit of the synchrotron, the electrostatic cutter is required to provide a higher voltage.

In the prior art, there is also an accelerator with a FODO structure, which uses a multi-turn injection method. The slow lead-out electrostatic cutter and the lead-out magnetic cutting iron are placed at a place where the horizontal beam envelope is close to the average value, and the slow lead-out does not use convex rails. , low utilization of the lateral acceptance of the synchrotron

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