Test Of Quench Protection Device Properties And Study On Dynamic Quench Process For Superconducting Undulator

Undulator is the key facility of the third generation synchrotron radiation facility. Currently permanent magnet undulator is the main undulator of the third generation of synchrotron radiation facility. In comparison to permanent magnet undulator, superconducting undulator has shorter period and higher magnetic field intensity, which can greatly enhance the performance of synchrotron radiation, resulting in higher energy and brightness and it is the trend of the next generation synchrotron radiation facility.Stableness of operation is required for superconducting undulator in order to ensure high-standard synchrotron radiation. Quench protection system for superconducting undulator is one of the key aspects for superconducting undulator to perform safe and stable. There are two vital bases in designing quench protection system: the test of device properties for superconducting undulator and the measurement of dynamic quench process. Thus the research on both is significant.This paper built a test platform in which: low-temperature properties of quench protection diode are gained; forward voltage data of quench protection diode in the zone from liquid helium temperature to room temperature are measured; the process of developing superconducting undulator simulating magnet is completed; and finally the key parameters of quench propagation are presented.Conclusions are as follows:1) Successfully built the test platform for the low-temperature characteristics of quench protection diode.2) Measured the voltage data of diode in the zone from liquid helium temperature to room temperature, providing important bases for the system design of quench protection.3) Managed to present the process of superconducting undulator test magnet, and successfully developed one. The performance of the simulating magnet fully meets the test requirements.4) Conducted a test for the dynamic process of the test coil for quench simulation of superconducting undulator and put forward that the quench of test coil mainly spreads along the main superconducting wires and the quench can propagate along superconducting wire into the adjacent grooves, rather being confined to one groove. Test results provide important theoretical bases for the design of the quench protection system for superconducting undulator.5)The concludes and achievements of this thesis are initiate.