Excitation method of bit-like high-temperature superconducting magnet controlled by magnetic switch

Abstract

The invention discloses an excitation method of a bit-like high-temperature superconducting magnet controlled by a magnetic switch, and belongs to the field of an application of high-temperature superconducting magnets. The bit-like superconducting magnet controlled by the magnetic switch is composed of the magnetic switch and the high-temperature superconducting magnet. The magnetic switch consists of a magnetic knife and a coil wound on the magnetic knife; and according to the high-temperature superconducting magnet, a plurality of double-hole superconducting sheets and insulating sheets are stacked, and then the stacked sheets are fixed together through an upper flange sheet, a lower flange sheet and a positioning rod. A coil formed by double-layer winding of a copper wire can be placed in a small round hole of each double-hole superconducting sheet, the coil is externally connected with a pulse power supply to form a magnetic switch, and when the coil of the magnetic switch is electrified, the magnetic switch is closed. By controlling the time sequence of the external power supply and the magnetic switch, a closed loop can be formed on the peripheries of the two round holes of the superconducting ring sheet. According to the invention, excitation saturation is quickly achieved by adopting the change of internal magnetic flux so that the excitation time is shorter and the efficiency is higher. A stable large-space magnetic field can be generated step by step, and closed-loop operation of the superconducting magnet can be achieved.

Description

technical field [0001] The invention belongs to the application field of superconducting magnets, in particular to an excitation method of a bit-like high-temperature superconducting magnet controlled by a magnetic switch. Background technique [0002] Superconducting materials have a history of hundreds of years since their discovery, and have the characteristics of zero resistance, complete diamagnetism and the "Josephson" effect. Superconducting magnet technology has many advantages that conventional conductors cannot match, such as no energy consumption when generating a strong magnetic field, small space occupation, and light weight. In some large-scale scientific projects, such as maglev trains, nuclear magnetic resonance NMR, etc., superconducting magnets are already in operation. Early accelerators typically used conventional electromagnets to generate the dominant magnetic field, which were bulky and power-hungry. After using superconducting magnets, the magnetic ...

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Problems solved by technology

[0003] At present, most of the superconducting materials used are REBCO superconducting tapes. Superconducting magnets are usually made by winding superconducting tapes into spiral tubes or double cakes. Therefore, the production of large magnets requires longer superconducting tapes. , resulting in relatively high magnet production costs

When the superconducting magnet is excited by a power supply at normal temperature, and the current lead is connected to the superconductor, and the two ends of the current lead are respectively at low temperature and room temperature, a large amount of heat will be transferred into the superconducting cryogenic container (thermal bridge effect); at the same time, the current lead Resistance and welding resistance between the current lead and the superconducting wire will generate Joule heating when energized, dissipate power and increase cooling costs

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