RU900699C - Apparatus for symmetrization of superconducting magnet gradient meter - Google Patents

Abstract

DEVICE FOR SYMMETRIZING A SUPERCONDUCTOR MAGNETIC GRADIENTOMETER, containing mutually perpendicular mini-gradiometers. The invention relates in the field of technical physics, in particular to devices of magnetometric technology, and can be used to symmetry an ultra-high-temperature magnetic gradiometer. In order to increase the sensitivity, the device for symmetrizing a superconducting magnetic gradiometer has a housing with a tube placed in it and two rods connected by a threaded connection to the bushings, on which there are fixed balancing elements located between the loops of the corresponding mini-gradiometers, with the possibility of translational movement, the first the minigradientometer is fixed in the housing perpendicular to its longitudinal axis, and the second minifadientometer is an ekrepmagnetogradientometrical sensor, balancing elements, characterized in that, in order to increase the sensitivity sensor, it has a housing with a tube placed in it and two rods connected by a threaded connection to the bushings, on which symmetrical elements are mounted, located between the loops of the corresponding minigradientometers, with the possibility of translational movement, the first mini-gradiometer attached to the housing perpendicular to its longitudinal axis, and the second mini-gradiometer mounted on a tube placed in the housing with the possibility of rotation around its axis, while the corresponding sleeve is located inside the tube, coaxially with it, and the balancing elements are made in the form of thin-film disks. flax on a tube placed in the housing with the possibility of rotation around its axis, while the corresponding sleeve is located inside the tube, coaxially with it, and symmetrically connecting elements are made in the form of thin-film disks. In FIG. 1 shows a design of a symmetrizer; in FIG. 2 is an electrical diagram of its inclusion in a circuit of a balanced sensor. Symmetrizatrr contains (Fig. 1) covers 1 and 2, housing i3, rods 4 and 5, end 6. sleeves 7 and 8, substrates with mini-gradiometers 9, 10, 11. applied to them, symmetrical elements 12 and 13, holders 14 and 15, the tube 16. The magnetogradiometric sensor 17 is shown in FIG. 2. The symmetrizator works as follows.,

Description

With the rotation of brackets 4 and 5, made in the form of screws and fixed by longitudinal covers 1 and 2. rigidly connected to the housing 3, there is a movement along the guides of the housing of the bushings 7 and 8, fixed from the turns around their axis leaving them holders 14 and 15 on which flat symmetrical elements 12 and 13 are made, made of a superconducting material in the form of, for example, thin-film disks. In this case, one guide along which the sleeve 7 moves is made in the form of a tube 16 fixed from the longitudinal movements by the cover 1 and the housing 3, and can be rotated together with the cap 6 and also fixed from the longitudinal movements by the covers 1 and 2, fixed on her substrate minigradientometer 11 around its axis parallel to the axis of the housing 3.

All non-superconducting parts are made of non-magnetic material. All the connections of the electric circuit of the magnetogradientometric sensor with the minigradientometers 9,10,11 are made by a thin superconducting wire.

Upon symmetrization of the magnetogradientometric sensor 17, first, using the corresponding pair of Helmholtz rings, a Z-component of the field is created,

It is coaxial with the magneto-gradientometric sensor 17, at the output of which a signal is recorded with an amplitude determined by the magnitude of the sensor symmetry. Then

by moving the balancing element 12 (see Fig. 2), it is ensured that the response of the magneto-gradientometric sensor 17 to the Z-component of the floor is reduced to a level indistinguishable against the background of gradient noise.

The loop area of the mini-gradiometer 9.10 is selected in accordance with the initial degree of symmetry of the magneto-gradiometric sensor 17, relative to the Z component of the magnetic field.

Symmetrization of the magnetogradiometric sensor 17 relative to the transverse components of the field, which are created by the corresponding pairs of Helmholtz rings, is performed by rotation, of the plane

mini-gradiometer 11.

The use of a symmetrizator makes it possible to reduce the mutual influence of elements, to reduce the inductance of a magnetogradientometric sensor, and to increase its sensitivity.

The symmetry value for each of the components was achieved with the help of a symmetrizator; it was no worse than 7 10 and was limited by the value available in

gradient noise laboratories.

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