Superconducting cavity quenching position detecting device completes the test of superconducting cavity

[ Instrument Network Instrument Development] On October 24th, the superconducting cavity quenching position detecting device (liquid helium temperature wave measuring instrument) developed by the Institute of High Energy of the Chinese Academy of Sciences completed the test for the 1.3GHz superconducting cavity. The device is the first superconducting cavity diagnostic device in China that uses the second sound to detect and locate the superconducting cavity.

Liquid helium temperature wave measuring instrument

In recent years, High Energy has continued research on high performance (high Q, high gradient) superconducting cavities. Among them, the liquid helium temperature wave measuring instrument is the key equipment for locating the defect position, and it is an important foundation and an indispensable key link for improving the performance of the superconducting cavity. This research was supported by the Beijing Advanced Light Source Technology R&D and Testing Platform (PAPS) project and the Shanghai Key Technology of X-ray Free Electron Laser Device (SHINE).

Real-time monitoring of quench signals

The liquid helium temperature wave measuring instrument uses the principle of GPS positioning to measure the exact position of the missing point by measuring the distance from the point of the superconducting cavity to the probe through the second acoustic probe (OST), thereby accurately positioning the defect and Subsequent studies provide an effective diagnostic tool. The device is composed of a second acoustic probe, a second acoustic signal amplifier, a data acquisition system, and a calculation and analysis software for the position of the point of loss.

After testing, the device can monitor the superconducting cavity test process in full, and record the quench information generated during the superconducting cavity test in real time: including the intracavity electromagnetic field extraction signal Pt and the second acoustic signal measured by the probe. This indicates that the device can be officially put into use for the search and analysis of superconducting cavity defects. Next, the equipment will be installed at Huairou PAPS base for performance research and testing of superconducting cavities, which will provide strong support for mass production of high performance superconducting cavities.