SU750613A1 - Magnetic separator - Google Patents

Description

(54) / VVAPHMTHblH SEPARATOR

I

The invention relates to nuclear physics and can be used to identify products of nuclear reactions.

Known high-frequency separator containing the target, the system of quadrupole lenses, dipole magnets, collimator, high-frequency separating section and collector products of nuclear reactions 1.

The disadvantage of this separator is its structural complexity.

The closest technical solution is a magnetic separator containing a target, dipole magnets and a collector for nuclear reaction products 2.

To separate the products of nuclear reactions knocked out of a thin target from the bombarding charged particles in the separator that have passed the target in the separator, a deviation in the transverse magnetic field is used, depending on the magnitude of the magnetic rigidity mV / S, where t, V, t is mass, velocity and charge d particles.

A significant disadvantage of this separator is the low degree of separation of the products of nuclear reactions from the bombarding particles, due to the fact that the values of the magnetic rigidity for the products

nuclear reactions and bombarding particles overlap.

The aim of the invention is to increase the degree of separation of nuclear reaction products from bombarding particles.

5 This goal is achieved by the fact that, in a known magnetic separator containing successively located target, a dipole magnet for stigmatic focusing, collecting a dipole magnet and a collector of nuclear reaction products, the target

10 is installed in the front focal plane of the first dipole magnet, and in its rear focal plane at the focal points of the bombarding particles there are screens installed, the dimensions of which are comparable with the size of the foci of the bombarding beams.

 particles.

The drawing shows a schematic of a magnetic separator.

The magnetic separator contains quadrupole lenses 1, a target 2, a separating 20 dipole magnet 3, screens 4, a collecting dipole magnet 5 and a collector of nuclear reaction products 6.

Claims (2)

The operation of the magnetic separator is carried out as follows. Mini 2 is irradiated by accelerated particles extracted from an accelerator with a small angular dispersion equal to a few milliradians. If necessary, a system of quadrupole magnets-lenses is used to reduce the angular spread of bombarding particles, which improve the parallelism of the trajectories. For example, a triplet of quadrupole magnets producing a telescope-type transformation with increasing particle cross-sectional area can be used as such a system. Target 2 contains a few milligrams per square centimeter of the substance and does not delay the products of nuclear reactions, with significant kinetic energy. The target 2 is located in the front focal plane of the dipole magnet 3. The dipole magnet 3 separates the nuclear reaction products emitted from the target from the bombarding particles passing through the target, the magnetic rigidity of which differs from that of the reaction products. The products of nuclear reactions have a wider angular distribution compared with bombarding particles and a regular deviation from the direction of the primary particles. A dipole magnet 3 converts a beam of nuclear reaction products diverging from a target into a wide and approximately parallel beam, and a close to parallel beam of bombarding particles into several converging beams with foci in the back focal plane of a dipole magnet 3 corresponding to different ionic charges of the particles. These beam transformations produce a dipole magnet 3 in both radial and axial sections of the particle beam. The transformation made by the system of quadrupole magnets in a plane perpendicular to the plane of the figure is shown in the upper part of the drawing. In the back focal plane of the dipole magnet 3, in the places where the foci of the bombarding particles are formed, screens 4 are installed that are comparable in size to the foci of the beams of the bombarding particles and, therefore, are significantly smaller than the nuclear products. These screens retard the bombarding particles without significantly reducing the intensity of the products of nuclear reactions, and thus produce an additional separation of bombarding particles. Dipole magnet 5 combined with dipole magnet 3 in the form of: a non-spacing and isochronous system, collects a wide beam of products of nuclear reactions in a spot comparable with the size of the size of the collector of products of nuclear reactions 6. The efficiency of additional separation of products of nuclear reactions is determined by the initial angular spread of particles, ion-optical parameters, and characteristics of dipole magnet 3, angular spread and directionality of nuclear reaction products. Claims Magnetic separator containing successively located targets, dipole magnet for stigmatic focusing, collecting dipole magnet and collector of nuclear reaction products, characterized in that, in order to increase the degree of separation of nuclear reaction products from bombarding particles, the target is set in the front focal plane of the first dipole magnet, and in its back focal plane in the places of the foci of the bombarding particles there are screens installed, the dimensions of which are comparable with the dimensions of the focus in beams bombarding particles. Sources of information taken into account in the examination 1. Kotov V.I. and Miller V.V. Focusing and separation of high-energy particles by mass, MI, M., 1969, §32, p. 184. 2. Maidikov V. 3. et al. A wide-range analyzer of reaction products on a beam of heavy ions, preprint P7-11393, Dubna, 1978 (prototype). G / / / I g