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Cyclotron Radial Focusing Method Based on Magnet Assembly Generating Torsion Orbit

A cyclotron and magnet assembly technology, applied in the direction of magnetic resonance accelerators, electrical components, accelerators, etc., can solve the problems of beam loss and low beam extraction energy, and achieve the effect of isochronism and radial focusing

Active Publication Date: 2019-10-15
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

With the acceleration of charged particles, the number of oscillations (Lorentz factor) of the particles in each revolution of the accelerator is close to an integer, resulting in strong resonance, resulting in beam loss, which limits the further increase of cyclotron beam energy, resulting in the extraction of energy from the beam less than 1GeV

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  • Cyclotron Radial Focusing Method Based on Magnet Assembly Generating Torsion Orbit
  • Cyclotron Radial Focusing Method Based on Magnet Assembly Generating Torsion Orbit
  • Cyclotron Radial Focusing Method Based on Magnet Assembly Generating Torsion Orbit

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Embodiment

[0055] The 3mA, 800MeV proton beam is injected into a high-energy, strong-current alternating gradient cyclotron, accelerated to 2GeV and extracted. The average radii of the beam orbits of 800MeV and 2GeV are 16.28 meters and 18.33 meters, respectively. Forward deflected radially focused magnets have a minimum field strength of 1.76 Tesla and a maximum field strength of 2.60 Tesla with a pole width of 2.09 meters. The reverse deflected axially focused magnet has a minimum field strength of 0.59 Tesla and a maximum field strength of 2.48 Tesla with a pole width of 1.82 meters.

[0056] In a traditional cyclotron, the number of radial oscillations is about 1.8 to 3.1 during the acceleration of charged particles at 800 MeV to 2 GeV. The range of radial oscillations is too large, and many strong resonance lines are crossed, resulting in beam loss. .

[0057] However, by utilizing the method of the present invention, the number of radial oscillations can be increased and its rang...

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Abstract

The invention provides a radial focusing method for a cyclotron based on a magnet assembly for generating a torsional pendulum track, comprising: step 1, under certain energy, implementing isochronismof the cyclotron by the magnetic field of a forward deflection magnet and the magnetic field of a reverse deflection magnet together; and step 2, setting the magnetic field strength of each magnet ofthe magnet assembly to a polynomial in the radial direction. The isochronism of the cyclotron is implemented by the magnetic field of the forward deflection magnet and the magnetic field of the reverse deflection magnet together under certain energy, so that the magnetic field strength still can be greatly improved at low energy or constant energy. Compared with the method that the energy and then the M value must be improved while the magnetic field strength increases due to the limitation of the isochronism in the prior art, the radial focusing method increases the slope of increase of themagnetic field strength with the radius, and meets the requirements of radial focusing while achieving the isochronism.

Description

technical field [0001] The invention belongs to the technical field of accelerators, in particular to a method for improving the radial focusing force of an isochronous cyclotron by a high-order, high-precision magnetic field. Background technique [0002] A magnetic field with a positive gradient in the strength of the axial component of the magnetic field produces a radial focusing effect on charged particles. In the existing isochronous cyclotron design technology, although the gradient of the axial component intensity of the magnetic field is positive, the magnitude of the gradient is limited by the isochronous condition. The final radial focusing effect is that the number of oscillations of charged particles in each circle is approximately equal to Lorentz factor. With the acceleration of charged particles, the number of oscillations (Lorentz factor) of the particles in each revolution of the accelerator is close to an integer, resulting in strong resonance, resulting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05H13/00H05H7/04
Inventor 边天剑王川张天爵李明安世忠
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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