Trapped Field of a Bitter-like HTS Magnet Using Partial Multi-Pulse Magnetization

Abstract

The Bitter-like high temperature superconducting (HTS) magnet, stacked by ReBCO annular plates, has the advantages of no current leads and bulky or expensive power supply, so that it is attractive for development of strong magnetic field with full HTS materials. In this paper, a zero-field cooling method is proposed to supply power for the Bitter-like HTS magnets. The background field is generated by a pulsed current source and a solenoidal coil, which is doubly wound by an insulated copper wire. This paper focuses on the characteristics between the height of solenoidal coils and the magnetic field induced in the Bitter-like magnet.The solenoidal coil functioning as primary winding is inserted coaxially into the Bitter-like HTS magnet, and Bitter-like HTS magnet is equivalent to the secondary winding. The power of the current source is provided by a pulsed current source with triangular waveform. The solenoidal coil was designed and analyzed for pumping energy into the Bitter-like HTS magnet. The relationship between the height of the solenoid and the excitation duration was obtained experimentally in 77 K at the specified pulse current amplitude and frequency. The results conforms the pumping principles and feasibility for HTS magnet with persistent current mode.