Coherent light generators – Particular pumping means – Pumping with optical or radiant energy
Patent
1988-10-20
1990-06-12
Scott, Jr., Leon
Coherent light generators
Particular pumping means
Pumping with optical or radiant energy
372 2, H01S 309
Patent
active
049339508
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method for simultaneously generating a monochromatic gamma ray beam with high energy and a monochromatic X-ray beam with high energy (hereunder these are collectively called "free positronium radiation light") and an apparatus for the same.
BACKGROUND TECHNIQUE
Conventionally, a laser or synchrotron radiation light (called "SR light" hereunder) is known as a light beam. The laser has a wavelength of the visible light region and its neighboring region. On the other hand, the SR light has a wavelength ranging from infrared rays to an X-ray of a long wavelength.
In the meantime, with the present technique for light beam generation, the generation of light is restricted to the X-ray region of a long wavelength, like in the SR light. In other words, it is impossible to generate an X-ray of a short wavelength and a monochromatic light beam, namely, a monochromatic gamma ray beam, which has photon energy of, for example, 0.1 MeV or more far higher than the X-ray of a short wavelength.
An object of the present invention is, therefore, to provide a generating method and apparatus for generating high energy light beams, namely, a short wavelength X-ray beam and a monochromatic gamma ray beam, which are excellent in the degree of monochrome and which have low noise.
DISCLOSURE OF THE INVENTION
In the present invention, generation of a free positronium beam is accomplished by separately accelerating and storing an electron beam and a positron beam to a predetermined energy and by joining both beams in a predetermined direction, and a free positronium beam is generated. This results in generating, along the positronium beam axis, a monochromatic gamma ray having an energy twice the electron energy and a monochromatic X-ray having a photon energy of 1.3/10.sup.6 of this gamma ray, as radiation light.
To this end, a generating apparatus is equipped with a set of storage.cooling rings for acceleration, storage and cooling of each of an electron beam and a positron beam and, an accelerator system for injection of the electron beam and the positron beam into both rings, respectively, and a joined portion for joining the electron and positron beams provided at both of the rings.
In this case the electron beam and the positron beam from the accelerator system for injection may be separately stored after they have been accelerated respectively to a predetermined energy by booster accelerators .
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a diagram for schematically showing one embodiment of a free positronium-radiation-light generating apparatus according to the present invention.
FIG. 2 is a diagram for showing another embodiment of a radiation-light generating apparatus according to the present invention.
FIG. 3 is a sectional view of doubled structure magnets used for integrating the electron storage.cooling ring and the positron storage.cooling ring.
THE BEST MODE FOR EMBODYING THE INVENTION
Next, the present invention will be explained in detail with reference to the drawings.
Referring to FIG. 1, a linear accelerator or microtron, for example, is used as an accelerator system 1 for electron positron injection. This enables acceleration of both electrons and positrons by the use of a single identical accelerator. It is to be noted that separate accelerators may be provided for the electrons and positrons. A deflection magnet 9 for branching is disposed at the exit of the accelerator system 1 for injection. Transmission systems 2 and 2' are equipped with beam deflection magnets 3, 3' and beam convergence elements 4, 4', respectively, to guide an electron beam and a positron beam into an electron-beam storage ring R and a positron-beam storage ring R'.
The electron beam storage.cooling ring R has a beam deflection magnet 5, a beam convergence element 6, a high frequency cavity 10 for electron acceleration and an undulator or wiggler 11 for electron dumping cooling. Similarly, the positron beam storage.cooling ring R' is equipped with a beam deflection magnet 5', a beam
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