On June 3rd, 2016, a superconducting model quadrupole magnet was successfully excited to the expected current and measured by a rotating coil magnetic field measurement system. This marks the successful development of the cryogenic vertical test platform for superconducting quadrupole magnets.
Developed by staff from the IHEP Accelerator Division, the cryogenic vertical test platform consists of a cryogenic dewar, a vertical rotating coil magnetic field measurement system, a superconducting power supply and quench protection system.
The rotating coil of the measurement system is inserted and fixed in the room temperature tube in the middle of the dewar, precisely positioned with respect to the superconducting quadrupole magnet. Then the strength of each higher order multipole field relative to the main quadrupole magnetic field can be measured.
The superconducting model quadrupole magnet is the first such magnet independently developed in China. The magnetic field measurement results showed that the superconducting model quadrupole magnet performed well. The sextupole component was 4.1× 10-4 and the other higher order components were all below 2.2 × 10-4 at the excitation current of 570 A.
The cryogenic vertical test platform is the first device to complete the low temperature rotating magnetic field measurement for superconducting quadrupole magnets in China. It can also be used to perform cryogenic vertical tests and field measurements for superconducting multipole magnets and superconducting insertion devices.
The success in development of the cryogenic vertical test platform lays a great foundation for developing superconducting multipole magnets and superconducting insertion devices in the future.
Site photo of the cryogenic vertical test (Image by IHEP)