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Quench protection in superconducting magnets

A technology of superconducting materials and high-temperature superconducting, applied in superconducting magnets/coils, superconducting/high-conducting conductors, magnetic objects, etc.

Active Publication Date: 2019-11-22
TOKAMAK ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The central pillar contains high-temperature superconducting material

Method used

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  • Quench protection in superconducting magnets
  • Quench protection in superconducting magnets
  • Quench protection in superconducting magnets

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Embodiment Construction

[0036] As originally proposed, the E3SPreSSO coil is wound inductively without increasing the magnetic field. In accelerator magnets, high-temperature superconducting coils are often used in the form of insert coils that are nested within larger Nb3Sn low-temperature superconducting coils to enhance the magnetic field of dipole magnets. In this case, they will operate at 4.2K or lower in liquid helium (LHe). E3SPreSSO coils can share cryostats and / or cooling devices with HTS and LTS magnets.

[0037] Several improvements can be made to the E3SPreSSO system when applied to a tokamak. The toroidal field coil of the tokamak device has a characteristic "D shape" and a separate return branch, the straight parts of the "D shape" are gathered in the central column, where their magnetic fields are superimposed, and the magnetic field of the separate return branch are relatively isolated. This results in a net field at the center column that is much larger than the field in the retu...

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Abstract

A toroidal field coil comprises a central column, a plurality of return limbs, a quench protection system, and a cooling system. The central column comprises HTS material. Each return limb comprises aquenchable section, two HTS sections, and a quenching 5 system. The quenchable section comprises superconducting material, and is configured to contribute towards a magnetic field of the toroidal field coil. The HTS sections comprise HTS material. The HTS sections electrically connect the quenchable section to the central column and are in series with the central column and the quenchable section. The quenching system is associated with the quenchable section 10 and configured to quench the quenchable section. The quench protection system is configured to detect quenches in the toroidal fieldcoil and, in response to detection of a quench, cause the quenching system to quench the superconducting material in one or more of the quenchable sections in order to dump energy from the toroidal field coil into the one or more quenchable sections. The cooling system is configured to cool each 15 quenchable section to a temperature at which the superconducting material is superconducting. Eachquenchable section has a heat capacity sufficient to cause a temperature of the quenchable section to remain below a first predetermined temperature when energy is dumped from the toroidal field coilinto the quenchable section, and a resistivity sufficient to cause decay of the magnet's current quickly 20 enough that the temperature of the quenched part of the HTS section remains below a second predetermined temperature.

Description

technical field [0001] The present invention relates to superconducting magnets. More particularly, the present invention relates to methods and apparatus for quench protection of such magnets, and in particular to methods and apparatus for quench protection of magnets for nuclear fusion reactors. Background technique [0002] A superconducting magnet is an electromagnet formed from a coil of superconducting material. Since the magnet coils have zero resistance, superconducting magnets can carry higher currents with zero losses (but non-superconducting elements cause some losses), thus enabling higher magnetic fields with lower losses than conventional electromagnets . [0003] Superconductivity only occurs in certain materials, and only at low temperatures. A superconducting material will behave as a superconductor in the region defined by the critical temperature of the superconductor (the highest temperature at which the material is a superconductor at zero applied mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21B1/05G21B1/21H01F6/02H01F6/06H01B12/00H02H7/00H10N60/20
CPCG21B1/057G21B1/21H01F6/02Y02E30/10G21B1/05H02H7/001
Inventor 保罗·努南罗伯特·斯莱德
Owner TOKAMAK ENERGY
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