Power electronic devices are typically utilized to provide quench protection for the superconducting magnets. Integrating quench protection devices in the Dewar can make the system more compact. The cryogenic characteristics of the power electronic device are therefore necessary to be studied in order to ensure that it can work properly under the low-temperature condition. The characteristics...
Persistent current switches (PCS) which switch between superconducting and resistive states enrich the operation scenarios of superconducting magnets and lead to simple but colorful charging procedures. The state of a PCS can be controlled through superconducting phase change such as in temperature controlled case, global failure of flux pinning such as in over current controlled case, or a...
Deperming of ship has been conducted since the World War Ⅱ by several Navies and faces hard work for the deperming of large-size ships. We have been investigating a ship deperming system using High Temperature Superconducting coil laid flat on seabed of shallow water. The investigation started from the calculation of magnetic field to be imposed on ship. Considering deperming procedure, the...
We have proposed a novel method to adjust the magnitude and direction of current in the second generation(2G) high temperature superconducting (HTS) coil by providing a strong constant magnetic field. This method can be contactless used in a variety of flux pump devices, such as linear-motor type flux pump, rotating flux pump and so on. We have redesigned the experimental device on the...
The output power of high stability dc power supply system which drives the water-cooled magnet of Steady High Magnetic Field Facility (SHMFF) can reach up to tens of megawatt, so that the circuit usually adopts the realization scheme of Silicon-controlled rectifier plus LC filter. And in order to generate low-ripple magnetic field required by the High field nuclear magnetic resonance and other...
A conventional rectifier based on a thyristor is widely used as a magnet power supply in the largest tokamak fusion device such as JT-60SA and ITER. The rectifier converts AC input power to DC output power supplied to the magnet bi-directionally. In order to energize and de-energize the magnet controlling power flow, the rectifier shifts phase angle of AC current with reference to input AC...
For the electrodynamic suspension (EDS) system that uses superconducting magnets, the transmission efficiency of no-contact on-board power source will be affected by the eddy current loss generated on the outer wall of the cryostat. To address this issue, improving the structure of the generator coils is an effective approach. In this work, we have carried out the optimization of the...
