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 [1] 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 [2] 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.

1<Pallows 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;

tyield strength;

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.


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