Title :
Bidirectional Repeating Long Pulse Magnet System for Magnetic Refrigerator
Author :
Bo Zhang ; Hongfa Ding ; Shaoliang Wang ; Quanliang Cao ; Mengyu Liu ; Qing Wan ; Yun Xu ; Liang Li
Author_Institution :
State Key Lab. of Adv. Electromagn. Eng. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
A bidirectional repeating long pulse magnet system for room temperature magnetic refrigerator has been designed in Wuhan National High Magnetic Field Center. By using ac power capacitor bank and anti-parallel thyristors, a bidirectional magnetic field is generated and the classical crowbar is removed for maximizing the utilization of energy. For the sake of long pulse width and repeating pulse application, a special rapid cooling magnet with large inductance of 87 mH and internal cooling channels is designed. It has a 60 mm bore and 16 layers, with 7 internal cooling channels built by annular sticks between layers. Finally, the proposed bidirectional repeating long pulse magnet system with bidirectional magnetic field of + 6.2 T/ -3.8 T and pulse width of 193 ms has been successfully achieved. The design and implementation of the proposed repeating pulsed magnet system will be presented in detail in the paper.
Keywords :
magnetic fields; power capacitors; refrigerators; thyristors; Wuhan National High Magnetic Field Center; ac power capacitor bank; annular sticks; antiparallel thyristors; bidirectional magnetic field; bidirectional repeating long pulse magnet system; internal cooling channels; magnetic refrigerator; pulse width; rapid cooling magnet; temperature 293 K to 298 K; Capacitors; Coils; Cooling; Inductance; Magnetic fields; Magnetic resonance; Superconducting magnets; Large inductance magnet; long pulse width; rapid cooling method; repeating pulsed field;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2013.2284432