X-ray or gamma ray systems or devices – Source
Patent
1995-12-26
1997-07-22
Wong, Don
X-ray or gamma ray systems or devices
Source
378101, 378102, H01J 3500
Patent
active
056510454
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a X-ray pulse generator.
Its applications are scientific, industrial and medical, such as e.g. crystallography, radiography and sterilization.
1. Background of the Invention
A X-ray pulse generator is already known from U.S. Pat. No. 5,044,004 (Collins et al) entitled "Flash X-ray Apparatus".
This known generator comprises a plurality of Blumleins connected between a high voltage source associated with a thyratron and a X-ray emitting head. However, such Blumleins are electric lines which are rectilinear and rigid and have a considerable length, so that the generator has large overall dimensions and the X-ray emitting head is either stationary or only slightly mobile.
2. Summary of the Invention
The present invention solves the problem of the design of a X-ray pulse generator having smaller overall dimensions than the known generator.
In order to solve this problem, the X-ray pulse generator according to the invention comprises: pulse and emitting head, each electric line comprising a first electrical conductor and a second electrical conductor separated by a dielectric, characterized in that it also comprises: and means and for triggering the electric pulse, which is then transferred to the X-ray emitting head by means of the electric lines, parallel to the electric power storage means and on the other side are connected in series to the X-ray emitting head.
The generator according to the invention is able to emit over very short times (equivalent to the length of the pulse), a much more intense X-radiation than that emitted by the conventional generators generally used in laboratories and in industry.
Moreover, the use of wound electric lines makes it possible to produce a small generator, which can be placed on a table and transported by one person.
Preferably, the electric lines of the generator according to the invention all have the same length, in order to obtain a good quality factor.
The generator according to the invention can also incorporate a plurality of parallel, electrically insulating supports, which are juxtaposed and respectively associated with the wound electric lines, each support having a groove in which the corresponding electric line is wound.
In order to reduce the corona effect, the generator according to the invention preferably also has means for pressing the supports against one another. To further decrease said corona effect, the lines are preferably coated in the grooves with an electrically insulating material.
Each line can be wound in a spiral or double spiral. Preferably, each line is a flexible coaxial cable, the first and second electrical conductors of said line being respectively constituted by the core and the braid of said coaxial cable. Such flexible coaxial cables are commercially available, which simplifies the manufacture of the generator according to the invention.
According to a particular embodiment of the generator according to the invention, each line is a spirally wound, flexible, coaxial cable, the first and second electrical conductors of said line being respectively constituted by the core and the braid of said coaxial cable, the spiral winding of each cable taking place on moving towards the center of the corresponding support and the supports are perforated in their central portion in order to permit the passage of cables from the side where the cables are connected to the electric power storage means to the supports respectively corresponding thereto.
Preferably, part of the flexible coaxial cables connected to the X-ray emitting head is left free to permit the mobility of said emitting head with respect to the remainder of the generator. This facilitates the implementation of the generator according to the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail hereinafter relative to non-limitative embodiments and the attached drawings, wherein show:
FIG. 1 An electric diagram of a generator according to the invention.
FIG. 2 A diagrammatic view of electrically insu
REFERENCES:
patent: 3363102 (1968-01-01), Barbour
patent: 3681604 (1972-08-01), Criswell et al.
patent: 4070579 (1978-01-01), Brewster
patent: 4578805 (1986-03-01), Pearlman et al.
Applied Physics Letter, vol. 52, No. 5, 1 Fevrier 1988, pp. 354-355, P. Krehl, Pulse Compression Effect in a Laser Driven Flash X-Ray Tube.
Review of Scientific Instruments, vol. 61, No. 5, May 1, 1990 NY pp. 1448-1456, J.J. Coogan, et al. Production of High-Energyphotons from Flash X-Ray Sources Powered by Stacked Blumlein Generators.
Review of Scientific Instruments, vol. 59, No. 10, Oct. 1, 1988 NY pp. 2260-2264, F. Davanloo et al. Flash X-Ray Source Excited by Stacked Blumlein Generators.
Cachoncinlle Christophe
Pouvesle Jean-Michel
Viladrosa Raymond
Centre National de la Recherche Scientifique
Wong Don
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