Design Of A Cryostat For10T Conduction-cooled Superconducting Magnet System And The Development Of Two-stage Pulse Tube Cryocoolers

Nowadays, Superconducting technology has been widely used in the fields of energy, information, transportation, scientific instruments, medical technology, defense, major scientific projects and other aspects. According to the estimation of the International Superconductivity Industry Summit, the Superconductivity Industry’s market share will rise to1500to2000billion dollars, therefore, the superconductivity industry has a wide space in market.Compared to the superconducting magnet system cooled by liquid helium, the conduction cooled magnet system by crycoolers is of simple structure, easy operation and low cost. In addition, the world is in a shortage of liquid helium. All of these factors above promoted the development of the conduction cooled magnet system by cryocooler greatly. With the continuous development ofpulse tube cryocoolers (PTCs), it becomes comparable with the G-M cryocoolers in the refrigeration performance. Moreover, as there are no moving parts, the pulse tube cryocoolers have more outstanding advantages like simple structure, low vibration, low noise, low electromagnetic interference, reliable performance and long life. Therefore, PTCs are being more and more used in the cooling of superconducting magnet system.This paper presents the development process of superconducting magnet cooled by cryocoolers. and introduces the latest research progress. Then, Analysis the type, the structural form and the regenerator of the cryocooler used in this superconducting magnet system. The main work in this paper is as follow:1. A cryostat for10T superconducting magnet system cooled by pulse tube cryocoolers is designed;the structure of enhanced heat transfer of the magnet is designed specially; the binary current lead is optimized and positioned; and the thermal load of the cryocooler is calculated carefully.2. The two-stage pulse tube cryocooler used to cool the10magnet system is developed; the performance of the pulse tube cryocooler is adjusted to the best value according to change the operating parameter. The best value is0.6W@4.04K,20W@43.61K, which is competent for the magnet system.