Patent
1987-05-20
1989-07-18
Yusko, Donald J.
328228, 328230, 328235, 328237, H05H 1304
Patent
active
048497053
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a magnetic resonance type accelerator having a revolving orbit including a central equilibrium orbit such as a synchrotron, an accumulation ring, a collision ring or the like, and more particularly to a method of incidence for injecting charged particles into a magnetic resonance type accelerator and a magnetic resonance type accelerator making use of this method of incidence.
BACKGROUND TECHNIQUE
Heretofore, a magnetic resonance type accelerator having a revolving orbit such as a synchrotron or the like has been known, and in recent years an SOR apparatus making use of this synchrotron has been proposed as a light source of an X-ray exposure apparatus for use in micro-fine machining of super LSI's.
In such a magnetic resonance type accelerator is provided an electro-magnet for displacing an equilibrium orbit that is called "perturbator" (or "kicker") and an inflector for guiding charged particles to a revolving orbit by generating a magnetic field or an electric field in a D.C. fashion.
In the case of the magnetic resonance type accelerator in the prior art, deflecting elements and converging elements have been disposed at a plurality of locations on the equilibrium orbit, and the charged particles guided to an incidence orbit by the inflector would enter the equilibrium orbit displaced by the above-mentioned perturbator. Thereafter, the above-described displaced equilibrium orbit is returned to its original location by weakening the magnetic field generated by the perturbator, and then incidence of the charged particles is completed.
However, in the case where an SOR apparatus is employed as a light source of an X-ray exposure apparatus, it is necessary to provide a small magnetic resonance type accelerator. But in order to reduce the size of a magnetic resonance type accelerator and inject charged particles with high energy, an electro-magnet such as a perturbator or the like which can generate a magnetic field varying at an extremely high speed and having a high intensity, becomes necessary. However, the intensity and response speed of a magnetic field that can be realized by means of an electro-magnet are limited, and so it is difficult to reduce the size of a magnetic resonance type accelerator.
On the other hand, in the case where charged particles are injected, accumulated and accelerated with an extremely weak magnetic field, the life of the accumulated charged particles is short, and hence, it is impossible to accumulate a sufficient amount of charged particles.
Accordingly, an object of the present invention is to provide a method of incidence of charged particles and an apparatus for practicing the method, which are simple, and in which a perturbator is not necessitated to generate a magnetic field of high intensity varying at a high speed.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided a method of incidence of charged particles onto a central equilibrium orbit in a magnetic resonance type accelerator in which revolving orbits including the central equilibrium orbit are defined, which method includes the step of forming a resonant orbit whose horizontal betatron oscillation number for these charged particles becomes 1/2, and varying this resonant orbit in time to inject the charged particles onto the central equilibrium orbit.
As a magnetic resonance type accelerator to which the above-mentioned method of incidence is applied, there is provided a magnetic resonance type accelerator comprising an inflector for guiding charged particles onto an incidence orbit, a first electro-magnet for generating a non-linear magnetic field employing an octa-pole magnetic field as a converging component in superposition on a principal magnetic field applied to revolving orbits to form a resonant orbit whose horizontal betatron oscillation number becomes 1/2in that non-linear magnetic field, and a second electro-magnet for generating a magnetic field including a quadrupole magnetic field as a principal component and varyin
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Tomimasu et al., "A600-MeV ETL Electron Storage Ring," IEEE Transactions on Nuclear Science, vol. NS-30, No. 4, Aug. 1983, pp. 3133-3135.
Horabik Michael
Sumitomo Heavy Industrie's, Ltd.
Yusko Donald J.
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