Development of indirect cooling cryogenic system with nitrogen and helium heat pipes for superconducting insertion devices at BINP

The use of a cryogenic indirect cooling system based on cryocoolers for superconducting insertion devices (wigglers and undulators) can significantly simplify the design. Making the magnet pole gap smaller due to removal of the helium tank walls enables increase in the maximum magnetic field value. To effectively cool the magnet, which is in a vacuum and has no direct thermal contact with cryogenic liquids, siphon-type heat pipes filled with nitrogen and helium are used. The paper describes the design features of various superconducting indirect-cooling insertion devices created at BINP.