A method of manufacturing a frameless ravnopravie superconducting solenoid
(57) Abstract:Usage: in installations fusion with magnetic holding the plasma. The inventive method is to create a frameless superconducting solenoid internal radial pressure within the limits defined by the ratio: P1=1/2t(1-a2b2)<P
=tln (b/a, where P1the first critical pressure; P2the second critical pressuret- yield strength; a is the inner radius of the solenoid, B is the outer radius of the solenoid, and on reaching his inner coils of elastic-plastic state, the pressure is removed, resulting in obtaining Ravnopravie cross section of a superconducting solenoid, increasing its resource and reserves are still increasing the critical current of the superconductor,the lack of mutual displacement of the turns of the solenoid. 4 Il.The invention relates to electrical engineering in the design of superconducting solenoids, can be used to create superconducting electric coils fusion reactor-tokamak.A known method of manufacturing a frameless superconducting solenoid by on the sa  coil Compression cylindrical holder is made with a preset force. The result is improved heat transfer, prevents displacement of the coil at the institution in its current mode of superconductivity and possible thus damaging the insulation.The closest in technical essence to the invention is a method of manufacturing a superconducting solenoid by winding it on a secondary core, which is then replaced by the main core, pre-cooled to a low temperature  Subsequent temperature equalization of the United elements is accompanied by stretching and compaction of coils of the solenoid, which improves heat transfer and prevents insulation faults in the establishment of the system operating current.Design features of the fusion reactor-tokamak (solid line, maximum radial convergence of design elements to make the best use of electromagnetic fields, a significant number odajnyk and diagnostic sockets, pin ends and electrical connectors) are not possible using superconducting solenoids manufactured by any of the considered methods (outer cylindrical band in the first case, the core inside the solenoid in the second).Features a method of manufacturing a frameless Ravnopravie superconducting solenoid by establishing an internal radial pressure, wherein the pressure is generated in accordance with a ratio of
P1= 1 < P<P=tln , where R1the first critical pressure;
P2the second critical pressure;
t yield strength;
and the inner radius of the solenoid;
b the outer radius of the solenoid, and the achievement of its internal coils elastic-plastic state, the pressure is relieved.The result is getting Ravnopravie cross-sectional area of the solenoid, resources solenoid due to the lower maximum operating circumferential stress, increase stock on the critical current of the superconductor, the lack of mutual displacement of the coils due to their compact compression.Practically, this pressure can be provided, for example, by using the device shown in Fig. 1. Inside the solenoid 1, located on the plane, inserts conical inserts 2, forming together with the pressure of 3 wedge connection. Depending on the selected angle of the wedge is a certain vertical movement of the press creates pobjoy turns plastic state.After removing the internal pressure coils in a state of plastic deformation, are compressed (i.e., circumferential stress <0) and play the role of rigid supports, equivalent role cooled core in the prototype. The outer coils of the outside steps of the plastic deformation, stretched, i.e., >0. All the coils are compressed in the radial direction (i.e., the radial stressro<0) and thus provides the solidity of the solenoid.In Fig.2 presents the distribution of residual district () and radial (ro) stresses in the solenoid after removing the internal radial pressure.The establishment of the current in the solenoid is accompanied by the appearance of ponderomotive forces. Typical distribution of circumferential and radialrostress from these forces in the coils of the solenoid is shown in Fig.3 by the dotted line.The obtained voltage is summed with the residual , due to which there is alignment circumferential stresses along the radius and is ravnopravnosti solenoid. The total voltager=ro+rncreate a radial compression of the coils of the solenoid. The distribution of the total stress is shown in Fig.3 solid lines.
allows to substantially increase the resource superconducting solenoid in connection with the reduction of existing district stresses in the superconductor, to increase the radial compression, preventing stratification and mutual slippage of turns of the solenoid, to increase the stock in relation to the critical current. The latter is associated with an additional increase of the longitudinal deformation of the inner turns of the solenoid, which received preliminary plastic deformation under applied pressure. It is known that the critical current Ikin superconductors "cable in conduit increases with increasing strain up to 0.6-0.8% where the relative deformation of the conductor (see Fig.4).A method of MANUFACTURING a FRAMELESS RAVNOPRAVIE SUPERCONDUCTING SOLENOID by establishing an internal radial pressure, wherein the pressure in the solenoid are created in accordance with a ratio of
< / BR>where P1the first critical pressure;
P2the second critical pressure;
a inner radius of the solenoid;
b the outer radius of the solenoid,
and reaching into his inner coils of elastic-plastic state, the pressure is removed.
FIELD: applied superconductivity.
SUBSTANCE: proposed method that can be used for manufacturing mechanically loaded superconductor windings designed for sustaining conductor stress higher than 100 MPa as well as superconductor windings and devices designed for operation under variable conditions, such as superconducting magnets for charged particle accelerators and superconductor inductive energy storages involves use of liquid epoxy resin as filler doped with finely dispersed powder of rare-earth intermetallide, for instance HoCu2 (holmium-copper) or CeCu2 (cerium-copper). Filler concentration is chosen between 20 and 50% of liquid epoxy resin volume.
EFFECT: enhanced performance characteristics of superconductor windings under variable conditions.
4 cl, 2 dwg
FIELD: high-voltage charged particles accelerators.
SUBSTANCE: device has high-voltage rectifier transformer, including high-voltage transformer, consisting of magnetic duct, rods with primary winding of which are encased in electrostatic screens, sectioned secondary winding, rectifier elements, inserted between sections of secondary winding, accelerator pipe with charged particles source, safety screen, inside safety screen compensation coil is mounted with possible presence of axial component of magnetic field in counter-phase to field vector, moving charged particles beam from accelerator pipe axis. Correction method includes forming by high-voltage rectifier transformer of high-voltage accelerator potential, initiation of charged particles flow in charged particles source, acceleration of charged particles flow in sectioned accelerator pipe, forming of beam of charged particles, while additional magnetic field is formed using compensating coils, mounted on external surface of safety screen.
EFFECT: broader functional capabilities, higher reliability, simplified construction, higher efficiency.
2 cl, 8 dwg
FIELD: applied superconductivity.
SUBSTANCE: proposed composite superconductor that can be used to manufacture superconductors for superconducting windings suffering heavy mechanical loads (at operating pressure across conductor higher than 100 MPa) as well as for superconducting windings and devices operating under variable conditions, such as superconducting inductive energy storage devices, dipole and quadrupole magnets for charged particle accelerators, has superconducting material fibers, matrix of high-conductivity metal, such as copper and rare-earth intermetallide possessing high thermal capacity at low temperatures. Composite superconductor is provided with metal sheath accommodating rare-earth intermetallide; mentioned wires and conductor are welded together. Metal sheath can be made in the form of hollow cylindrical conductor or flat strip with hollow interlayer, their hollow spaces being designed to dispose rare-earth intermetallide. Composite superconductor is made in the form of a few multiple-fiber composite superconducting wires twisted around hollow cylindrical conductor accommodating rare-earth intermetallide. Composite superconductor can be made in the form of flattened single-lay strand of several multiple-fiber composite superconducting wires and several hollow cylindrical conductors of same diameter accommodating intermetallide which alternately vary within strand. Rectangular-section conductor is made of high-conductivity metal and has longitudinal groove.
EFFECT: enlarged functional capabilities.
7 cl, 8 dwg
FIELD: electrical engineering, superconducting electromagnets for their change-over to sustained current operation with the use of detachable current conductor.
SUBSTANCE: the device has a superconducting coil cooled in a vacuum container. The first current conductor is fixed inside the vacuum container. Its one end is connected to the superconducting coil, and the other has a contact section of the wire. The second current conductor passes through a through hole provided in the vacuum container with keeping of leak-proofness. Its one end is connected to the wire line leading to the outer source of exciting current, and its other end has a section of disconnection/connection, it is installed on the contact section of the wire for detachment. The device is made for change over to sustained current operation by means of the current fed from the outer source of exciting current, when the mentioned section of connection/disconnection is in contact with the wire contact section, and can maintain the sustained current operation after its disconnection from the wire contact section.
EFFECT: provided effective, precise and safe connection of the current conductor of the superconducting magnet.
14 cl, 8 dwg
FIELD: electric engineering.
SUBSTANCE: in accordance to method for changing amount of energy in magnetic system, current is measured in at least one pair of windings of magnetic coil, while changed in one coil is electric current of one direction of current density vector, and in another winding electric current of opposite direction of current density vector is measured. Device contains magnetic coil containing at least one magnet with winding. Magnetic system contains at least one more winding, while at least two windings are made with possible connection as one pair of windings and are made with possibility of joint powering by currents of opposite directions, while it is possible to inject energy into at least one pair of windings and to eject energy from at least one pair of windings.
EFFECT: increased efficiency of parameter changes in magnetic system.
2 cl, 14 dwg
SUBSTANCE: thermo stabilised superconductors are implemented in the shape of matrix from metal or alloy, containing fibers of superconducting material and combination of rare-earth metals with extremely high heat capacity at low temperatures. At that superconductor contains at least two metallic tubes of unconditioned cross-section filled by combination of rare-earth metals and distance between tubes is not less then two tube linear dimensions. Superconductor has external envelope made from metal with high conducting properties. Tubes with combination of rare-earth metals can be distributed either by section of conductor as in matrix or by envelope.
EFFECT: extension of superconductor capabilities by means of increasing of its heat-absorbing abilities.
SUBSTANCE: proposed saddle shaped coil winding (3) is made from a flat shape of a race track type coil on a pipe-like lateral surface (Mf) such that, it contains winding sections (3a) axially passing on the lateral side and winding sections (3b, 3c), passing between them on frontal sides, which form end windings. Separate turns (Wi) of the coil winding must be made from at least one tape of a superconductor (5), particularly with superconducting material with high critical temperature Tc, whose narrow side (5a) faces the pipe-like lateral surface (Mf). To prevent inadmissible mechanical loads on the conductor when forming the winding, turns (Wi) in the saddle shape must have perimetre (U) respectively, which remains virtually unchanged compared to that in a flat coil.
EFFECT: efficient use of superconducting material from ready tape-like conductors with compact arrangement of windings; small diametre can be achieved of the area forming the pipe-like lateral surface.
23 cl, 10 dwg
SUBSTANCE: invention relates to electrical engineering, specifically to thermo-stabilised superconductors based on the Nb3Sn compound and methods of making the said superconductors. The thermo-stabilied superconductor based on the Nb3Sn compound is made in form of a matrix from a metal or alloy, containing superconducting material fibre, metal tubes filled with a rare-earth metal compound with extremely high heat capacity at low temperatures, an outer hollow copper cylinder and a thin cylindrical shell made from titanium and/or niobium placed coaxially between the matrix and the outer hollow copper cylinder. The metal tubes are tightly pressed to each other in the gap between the cylinder and the shell in the first version, or in a gap made in the radial direction in the wall of the cylinder in the second version. The method of making such thermo-stabilised superconductors is described.
EFFECT: wider functional capabilities of a thermally insulated superconductor due to presence in the superconductor of a rare-earth intermetallic compound with extremely high heat capacity at helium temperatures, which increases mean heat capacity of the superconductor by 5-6 times.
12 cl, 11 dwg
SUBSTANCE: electrotechnical current limitation device includes primary winding, secondary winding containing suppressed superconductor which is characterised by transition from condition with low resistance to condition with high resistance when electric current exceeds critical value. Secondary winding is connected to primary winding with common part of magnetic flow. In addition, secondary winding includes metal element (6) creating closed circuit, and cryostat (5) providing cooling of secondary winding. Besides it includes at least one element (3) arranged on considerable part of non-suppressed conductor characterised with minimum dependence of its resistance on current and magnetic field, and some part of suppressed superconductor. At least one loop of non-suppressed superconductor (3) and suppressed superconductor (2) are electrically connected in series, thus forming closed circuit.
EFFECT: reducing response time and providing the possibility of controlling it.
17 cl, 8 dwg
SUBSTANCE: device with superconducting coil includes the following: cylindrical container for coil, which has inner circumferential surface and outer circumferential surface. Superconducting coil is stored in cooled container for the coil so that superconducting element is wound on circumferential surface. Columnar magnetic body is attached to inner circumferential surface of container for coil.
EFFECT: sizes are decreased.
4 cl, 11 dwg