Device for rotating beam of high-energy heavy ions

FIELD: physics.

SUBSTANCE: device for rotating beam of high-energy heavy ions has a cylindrical resonator cover, end flanges with beam input and output openings, several pairs of deflecting plates mounted on supports, a high-frequency power supply and a focusing system. Each deflection plate has correcting projections lying on the edges parallel to the longitudinal axis. The total volume of the resonator is formed by structurally independent sections which are fastened together, with a pair of deflection plates at the centre of each of the sections. Distance between centres of the plates along the axis of the resonator is equal to D=V/2f, where V is the velocity of deflected ions and f is the working frequency of the resonator. Along the outer edge of each deflecting plates away from the axis there is a projection which shortens the distance between the plates on the periphery of the deflection gap; a deflector may have a different number of sections.

EFFECT: invention enables to obtain resultant ion deviation which is proportional to the total number of cells passed, which can reach any necessary value when the sufficient length of the deflecting resonator is chosen.

1 dwg

 

The invention relates to the field of physics of charged particle beams and accelerator technology and can be used to create hollow quasitransitive heavy-ion beam of high energy rotating around the longitudinal axis with a high frequency. Such a beam can be used in experiments on inertial fusion.

There is a method of deflection of a beam of heavy ions with high energy by exposure to electric and/or magnetic fields. In this method, the beam passes through a pair of vents, one of which deflects the beam in the vertical plane and the other horizontal. Thus the amplitude and phase of the deflecting fields must be coordinated so as to obtain the desired trajectory of the rotation.

Closest to the proposed device according to the totality of symptoms is the magnetic deflector, in which the beam is deflected in the horizontal and vertical planes under the action of an alternating magnetic field. In this device, the phase difference between the horizontal and vertical deflection equal to 90 degrees, and the amplitude of the field in them is different. This device allows you to receive a beam of heavy ions with high energy rotating around the longitudinal axis with a frequency of the order of 30-60 Hz and used to generate the radiation field in the field of radiation biology and therapy, 1, 2, 3]. The main disadvantage of the prototype is the low frequency of rotation of the beam, due to the high inductance of the deflecting magnets.

To eliminate the disadvantage of the prototype and increasing the frequency of rotation of the beam is proposed to use high-frequency (HF) driver rotating around the longitudinal axis of the beam of heavy ions with high energy, containing two separate RF deflector for vertical and horizontal deflection of ions and focusing system. The device illustrated in the drawing 1, which schematically shows its main elements.

RF deflector consists of a cylindrical casing resonator 1, the end flanges 2 with holes for input and output beam and several pairs of deflecting plates 3, and the radial bearing 4 opposite plates secured along diametrically opposite the forming cylinder, symmetrically relative to the longitudinal axis. Each deflector plate has an adjustment tabs 5 which are located on the edges parallel to the longitudinal axis. The total volume of the cavity formed bonded together structurally independent sections. The distance between the centers of the plates along the axis of the resonator is chosen equal to D=V/2f, where V is the velocity of reject ion, a f is the operating frequency of the resonator.

The device operates as follows. In the resonator introduces high is astaty signal, which excites the electromagnetic field. On the desktop as fluctuations deflecting electric field in adjacent cells varies in antiphase, always having a counter direction. At the same time, when performing the resonant conditions D=V/2f time-of-flight of ions from one pair of plates to the other in exactly equal to the half period of the RF oscillations. Because the time span between the cells in the direction of the field reverses, each particle deflecting passes all intervals in the same phase transverse deflecting field. Thus, the resulting deflection of the ions is proportional to the total number of traversed cells and can reach any required size when choosing a sufficient length of deflecting cavity. The electric field in the adjacent deflectors deflecting ions in horizontal and vertical directions, are shifted in phase by 90 degrees. Therefore, after passing through the deflecting system in General, the beam acquires transverse momentum, causing it to rotate around the longitudinal axis, describing a circle in the transverse plane.

References

1. Wobbler Dosimetry for the Biomedical program at the LBL Bevalac, W.Chu, M.McEvoy, M.Nyman, etc., IEEE Transactions on Nuclear Science, vol. NS-32, No. 5, 1985.

2. Wobbler Facility for Biomedical Experiments at the Bevalac, W.T.Chu, S.B.Curis, J.Llacer, IEEE Transactions on Nuclear Science, vol. NS-32, No. 5,1985.

3. New Heavy-ion Cancer Treatment Facility at HIMAC, K.Noda, T.Furukaa, T.Inaniwa, etc., EPAC08.

A device for rotating the beam of heavy ions with high energy, consisting of a cylindrical casing resonator, the end flanges with holes for input and output beam source RF power and the focusing system, characterized in that on the inner surface of the cavity has been consistently found several pairs of deflecting plates, and the radial support of the opposite plates secured along diametrically opposite the forming cylinder, symmetrically relative to the longitudinal axis and the longitudinal distance between the centers of the plates D is defined as D=V/2f, where V is the velocity of reject ion, a f is the operating frequency of the resonator; along remote from the axis of the external the edges of each of the deflecting plates made the projection that reduces the distance between the plates at the periphery of the deflecting gap; the deflector may include a different number of sections.



 

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