Central solenoid for resistive plasma heating

FIELD: plasma physics and controlled nuclear fusion problem.

SUBSTANCE: proposed central solenoid used as tokamak inductor and easily dismounted from central column has four conductor layers with inner cooling ducts. Each layer is made separately with four entrances in each layer. All sixteen conductors are connected in series and their junctions are disposed on butt-end surfaces of solenoid switching blocks. Insulated layers of conductors are inserted one into other.

EFFECT: reduced operating loads, enhanced uniformity of magnetic field.

1 cl, 1 dwg

 

The invention relates to a technique related to plasma physics and the problem of controlled nuclear fusion, and is used as an inductor of the tokamak.

The Central solenoid ohmic heating (can) is designed to generate an alternating magnetic flux through the circuit is covered by a plasma round. Can must ensure the rise of the plasma current and to maintain it at a steady level during the specified period of time, maintaining the existing mechanical and thermal loads.

To reduce the time interval between runs of the tokamak can must have a cross-section of the conductor, optimal for a given value of current and minimum dimensions subject to required heat mode.

To improve the manufacturability of the solenoid when the winding and insulation of coils, can conductor length should be the minimum that will not require the use of special technological equipment and facilities.

Known design can (Gusev V.K., Shahovets KG, oak ridge, 12-16 October 1992 international Symposium), a spiral conductor with an internal cooling channel, wound on technological mandrel at one time in two layers.

However, a single long conductor creates the problem of cooling to prevent overheating of the water, its speed is increasing, which leads to an increase of hydraulic losses and the occurrence of cavitation erosion of the cooling channels.

To compensate for the hydraulic losses and conservation of flow per unit of time is necessary to increase the capacity pumping systems, which currently allow you to move water at a rate no more than 10...12 m/s, or develop new ways of cooling the conductors.

The closest technical solution, selected as a prototype, is can install Mast (A.W.Morris and T.N.Todd for the MAST Team. UKAEA Fusion, Culham Scientre, UKAEA/EURATOM Fusion Association, 1997), which is a cylindrical 4-layer construction consisting of 8 spiral conductors with internal cooling channels with two hits in each layer, and the conductors are wound directly on the Central pillar of the product.

In this design can connection conductors "current" is series-parallel, "on the water" - parallel, and the nodes connecting conductors are at the ends.

The main disadvantages of design can install MAST are:

the winding of the conductor directly on the Central pillar, which excludes the possibility of checking the insulation on the inner surface of can and on the Central pillar;

after winding design becomes permanent and repair turn-to-turn and layer of the population is difficult;

- a series-parallel circuit requires more complex controlled power supply with feedback for equalizing the currents in the parallel branches of the circuit.

The invention is directed to creating a design can, provides:

- reduction of operating loads by minimizing currents in the switching nodes, running across the magnetic field;

- the possibility of dismantling can with the Central column for repair or replacement;

- interchangeability of CCON and Central columns;

- increase in the incremental switching conductors on the water, which simplifies the manufacturing technology of conductors, winding and insulation of coils, as well as the reduction of hydraulic losses;

- more uniform magnetic field due to the serial connection of conductors.

The technical result is achieved by the fact that the design can of KTM consists of four layers of conductors with internal cooling channels, each of which contains four conductor in the form of a spiral, going between them respectively after the application of insulation and are connected in series.

The invention is illustrated by the drawing, which shows a diagram of can with conventionally removed the top cover: input terminal 1, an output terminal 2, a switching block 3, tube cooling system 4, spiraldynamik 5, insulation 6, the lower cover 7, the cooling channel 8.

The claimed can differs from the prototype in that each layer of conductors is collected separately from the four conductors and the conductors are connected in series.

The claimed can is a cylindrical four-layer structure with a total height 3132 mm outer diameter 562 mm and an inner diameter of 310 mm with four hits in each layer, 16 spiral conductors 5 are wound in layers and have a serial connection to a homogeneous distribution of the electric current. Each wire 5 is cooled offline, switching turns on the water - parallel. Guides can made from silver bronze (oxygen-free copper with the addition of 0.1% silver) with an electrical conductivity of 101.5% compared to pure copper, the electrical insulation of coils and layers of Tson - made of polymer composite materials based on polyamide or epoxy resin, ensuring continuous operation at 300-400°or at 150-170°in the second case. The nodes connecting conductors are arranged on the end surfaces of can, which reduces the dynamic effect of magnetic field on the jumper between the coils of can.

On the end surfaces of can made slotted grooves for mechanical perception of the power loads on the jumper side magnetic on the I (soldered connection provides only electrical contact). Switching pads 3 (jumper) (8 PCs), with projections for slotted connections and holes for water quench system, soldered to the respective surfaces of the conductors can. The inlet tube 4 cooling system installed in the holes of the switching pads 3.

The solenoid operates as follows: power is supplied to the terminal 1. Falling in a downward (the conductors of the first and third layer left wound conventionally called descending) conductors of the first (the numbering of the layers of the solenoid, from the center to the periphery) layer and rising on the ascendant (the conductors of the second and the fourth layer with the right wrapped conventionally called ascendant) conductors of the second layer, the current passes all eight spiral conductors of the first and second layers are connected in series by means of pads 3 arranged on the upper and lower ends of the solenoid. In block 3, located between terminals 1 and 2, the current passes in the third and fourth layers. Similarly, the current passes eight spiral conductors of the third and fourth layers connected in series using pads 3 arranged on the upper and lower ends of the solenoid. Then the current goes to terminal 2.

Thus, the current, bypassing all sixteen of series-connected spiral conductors, makes 16×n turns in the direction shown in the drawing, p is the left main coronary artery (n - the number of turns in each conductor), i.e. the equivalent number of turns of the solenoid - 16×n.

As interconnected blocks only the ends of the conductors located in close proximity to each other, the lengths of the pads 3, where the current flows across the magnetic field, minimum, therefore, the minimum and the force acting on the pads by a magnetic field.

Water is supplied to each of the sixteen conductors independently through tubes 4 located on the top end, and uses the same tubes that are located on the bottom of the solenoid. The water velocity is 1 m/sec (5 m/s if necessary).

The claimed cson is a self-executing node and provides the convenience (manufacturability) Assembly and repair; reduction of operational loads by minimizing currents in the switching nodes, running across the magnetic field more uniform magnetic field through a serial circuit switching all four approaches spiral conductors in 4 layers.

The Central solenoid ohmic heating of the plasma containing the conductors with internal cooling channels, wound in four layers, nodes, connections which are located on the end surface of the switching blocks, characterized in that the conductors are wound with four visits to the each layer and are connected in series.



 

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