SU793343A1 - Accelerating structure - Google Patents

Description

(54) ACCELERATING STRUCTURE

The invention relates to accelerators of charged particles and can be used as an accelerating structure in proton linac accelerators with energies above 100-160 MeV and electronic linear accelerators.

Cylindrical volume p «ators are known, used as accelerating structures in proton linear accelerators with energy higher than MeV and in electronic linear accelerators x 1.

Also known is the acceleration structure 2 in the form of a cylindrical resonator periodically loaded with conductive washers and diaphragms. The operating oscillation in such a resonator is an oscillation of the type EOZN (- (NUMBER of conductive washers in the resonator).

The disadvantage of the accelerating structure is that azimuthal-neo-pluralistic oscillations are also excited in the resonator, which can be in close proximity in frequency to the working - - wave or

even match up with

her. These oscillations are oscillations of an optical-magnetic type, where t determines how many wavelengths fit along the circumference of the resonator and depend on

on the amount of semi-bar. The main otli; The key to these oscillations from the worker is the absence of the longitudinal component of the electric field EZ on the cavity axis. 5 The number of oscillations of type “is equal to 2L. The planes of the antinodes of the electric field of such oscillations are located between the half bar. The presence of fluctuations of type E „, near

10 Pa. Working - - waves causes deterioration

resonant properties of the resonator, decrease. good quality, a decrease in the intensity of the working oscillation, an increase in losses, and during the passage of a beam of charged particles

15 through the accelerating structure — the interaction of the beam with these oscillations and the loss of particles.

OBJECTIVE OF THE INVENTION

20 the effect of azimuthally asymmetric types of waves on the parameters of the working oscillation by displacing them in h, astto.

The goal is achieved by the fact that in the known accelerating structure in the form

25 cylindrical resonator periodically loaded with conductive washers and diaphragms, cuts are made in the diaphragms along the radius, starting from the inner edge of the diaphragm branched symmetrically along

30 azimuths in one and the other side until the total length of the radial part of the section and half the length of the azimuthal part of the section is (0.22– 0.23) I, where K is the working wavelength. The drawing shows a cross section of the proposed accelerating structure. Conductive washers, 1, are placed on the tides of diaphragm 2 and fixed on three half-barrels 3, equidistant from each other. In each module, which includes a washer with a diaphragm, a half-bar and a cylinder 4, in the middle of each gap between the tides of the diaphragm in the planes of the antinodes of an electric field of oscillation type, the radii are cut from the inside edge of the diaphragm, branched symmetrically along the azimuth to one and the other side from until the total length of the radial part of the section and half of the length of the azimuthal section of the section is (0.22-0.23) X. The radial part of the section interrupts the line of oscillation currents of the type ,, ,, and, consequently no, it is driven by the field, which in turn excites the floor in antiphase halves azimuthal part of the section. The total effective length is the sum of the radial part of the section and half the length of the azimuthal part of the section. The whole family of type oscillations is shifted in frequency so that the closest oscillation type, is located much lower in frequency

-wave and the effect of oscillations of the type E & C, on the radio characteristics of the working -wave is completely excluded. There is no field for the working oscillation in the radial part of the section, since the radial part of the section does not interrupt the current oscillation current lines.

Sources of information taken into account in the examination:

1. USSR author's certificate No. 284197, cl. H 05 H 7/00, 1968.

2. USSR author's certificate number 414760, cl. H 05 H 7/00, 1977 (prototype). In the halves of the azimuth part of the section, an in-phase field is excited (the working oscillation does not have azimuth variations in the field), which do not excite the field in the radial part of the section and, therefore, the effective length of the section is small and practically does not affect the radio characteristics of the working - - wave. The use of the invention will make it possible to eliminate the deterioration of the resonant properties of the accelerating structure and eliminate the loss of particles during the passage of a beam of charged particles through the accelerating structure.

Claims (1)

 Invention Accelerating structure in the form of a cylindrical resonator periodically loaded with conductive shields and diaphragms, characterized in that, in order to eliminate the effect of azimuthal asymmetric wave types on the parameters of the operating oscillation by shifting them in frequency, radial cuts are made in the diaphragms starting from from the inner edge of the diaphragm branched symmetrically in azimuth to one and the other side until the total length of the radial part of the section and half the length of the azimuthal part of the section is vit (0, 0,23) X, where K is - the operating wavelength.