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Strain-based or magnetic field-based quench detection

A technology of magnetic field and magnetic field coil, applied in the field of quench detection

Pending Publication Date: 2022-06-24
TOKAMAK ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a small-diameter central pillar is required, which poses a challenge for the design of plasma confinement magnets

Method used

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  • Strain-based or magnetic field-based quench detection
  • Strain-based or magnetic field-based quench detection
  • Strain-based or magnetic field-based quench detection

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Embodiment Construction

[0021] Partially insulated and non-insulated coils, i.e. coils with (non-superconducting) conductive paths between the turns that allow current to flow radially between the turns, are generally resistant to quenching (magnets become non-superconducting during operation) As well as resisting damage during quench (as this is partly caused by arcing between turns in the insulated coil). However, it has been found that due to large changes in the magnetic field and the resulting strain caused by the current passing from the helical path (i.e. in the HTS of the coil) to the radial path (i.e. directly through a metal connection or partial insulation), the partial Quench in insulated and non-insulated coils can cause significant damage. This is especially noticeable in magnet systems with multiple coil sections, eg, toroidal field (TF) coil sets used in tokamak devices. If one "branch" of a TF coil quenches, the resulting magnetic imbalance can cause significant damage to the entire...

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Abstract

A method of detecting a pre-quench condition in a superconducting magnet including an HTS field coil. The magnetic field coil includes: a plurality of turns including an HTS material and a metal stabilizer; and a conductive material connecting the turns such that a current may be shared radially between the turns via the conductive material. Strain of the HTS field coil and / or a support structure of the HTS field coil is monitored. The monitored strain is compared to an expected strain during normal operation of the magnet. In response to the comparison, it is determined whether the field coil is in a pre-quench condition. A similar method is provided in which the magnetic field of the field coil of the HTS is monitored to detect a pre-quench condition, rather than strain.

Description

technical field [0001] The present invention relates to quench detection in high temperature superconducting magnet systems, and more particularly, to a method of quench detection and a magnet system configured to implement the method. Background technique [0002] The challenges of generating fusion energy are complex. In addition to tokamak devices, many alternative devices have been proposed, but none have produced any results comparable to the best tokamak devices currently in operation, such as the JET. [0003] World fusion research has entered a new phase after the construction of ITER, the largest and most expensive (about 15 billion euros) tokamak ever built. A successful route to commercial fusion reactors requires long pulses, stable operation, and the high efficiencies needed to make electricity production economical. These three conditions are particularly difficult to achieve simultaneously, and the planned project will require years of experimental research ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F6/02H01F6/06H10N60/01
CPCH01F6/02H01F6/06Y02E30/10G21B1/057
Inventor 罗伯特·斯莱德罗德·贝特曼
Owner TOKAMAK ENERGY