Abstract
A full high temperature superconducting (HTS) magnet can operate in persistent current mode (PCM), which has promising application in high magnetic field. A laboratory scale Bitter-like HTS magnet stacked by REBaCuO (RE: rare earth element) annular plates was proposed and it can operate in PCM without current lead and joint resistance. This study focuses on the temporal stability of the magnetic field generated by the magnet, which was energized by the multi-pulsed field magnetization (MPFM) method composed of a solenoid coil and pulsed triangular waveform current source and tested at 77 K (LN2 bath). The characteristics of the magnetic field in the magnet with various pulsed current amplitudes, durations and reversal excitation experiments were systematically researched. Moreover, the numerical simulation of the magnet energized with the pulsed current amplitude 3A was performed and the attenuation of the magnetic field in the magnet was discussed and analyzed.
Highlights
The Bitter magnet was a solution created by Francis Bitter in the 1930s to solve the thermal heating problem with metal conductors in resistive magnets.[1]
The typical applications of the high temperature superconducting (HTS) coated conductors was promising in application high field magnet because of its superior mechanical characteristics and high current density in high field comparing with the low temperature superconducting (LTS) conductors.[6]
It can be concluded that pulsed current amplitude 3 A is the appropriate for this magnet excited by multi-pulsed field magnetization (MPFM) because it has the same excitation speed and magnetic field saturated value compared to pulsed current amplitudes 5 A and 8 A
Summary
The Bitter magnet was a solution created by Francis Bitter in the 1930s to solve the thermal heating problem with metal conductors in resistive magnets.[1] The Bitter magnet has been reported to achieve 41 T ultri-high magnetic field.[2] Currently, the structure of the Florida-Bitter is often adopted in bitter disk.[3,4,5] the Bitter magnet requires a huge power supply and water-cooling system. The typical applications of the high temperature superconducting (HTS) coated conductors was promising in application high field magnet because of its superior mechanical characteristics and high current density in high field comparing with the low temperature superconducting (LTS) conductors.[6] The REBaCuO (RE: rare earth element) coated tape was investigated intensively for using in HTS magnets/coils with the structure of the double-pancake or layer-wound coil.[7,8,9] the HTS coated conductors joint of sufficient technological quality have not been achieved to date, a series of research work have been developed to achieve the true persistent current mode (PCM). Once the flux pump is turned off, the magnetic field generated by the HTS coils decayed rapidly over time
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