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High Energy Photon Source (HEPS) is a high-performance and high-energy synchrotron radiation light source with a beam energy of 6GeV and an ultra-low emittance of better than 0.06nm×rad. The HEPS is mainly composed of accelerator, beamlines and end-stations. The HEPS would provide the synchrotron beam with will brilliance higher than 1×1022 phs/s/mm2/mrad2/0.1%BW. And the hard X-ray with photo energy up to 300 keV would be provide in order to satisfy the requirement of in operando experiments. No less than 90 high performance beamlines and end-stations are capable to be built around the storage ring. To support a cryogenic environment temperature demand of the HEPS, a large cryogenic system must be built. And to meet HEPS’s extremely high requirements for ant-micro-vibration, compressors units of the cryogenic system are placed in the cryogenic hall, and other cryogenic equipment such as cold box, Dewar and cryogenic distribution valve box just as close as possible to cryogenic devices. As a result, the distance of the transmission pipes are elongated. So an appropriate cryogenic cooling scheme, transmission line diameter, low cooling loss and long-distance cryogenic fluid transfer and distribution are key technologies.
The cryogenic system includes a helium refrigerator system and a nitrogen cryogenic plant. The helium refrigerator system has been consisted of a helium refrigerator on a capacity at 2000W@4.5K, a cryogenic distribution transfer system and helium recovery and purification system for 10 superconducting radio frequency cavity cryomodules. The pressure stability at ±1.50mbara of the low pressure in helium compressors has achieved, which is a great significance to these superconducting radio frequency cavities. The nitrogen cryogenic plant is crucial for creating and maintaining operational conditions of the thermal shield of superconducting radio frequency cavity cryomodules, precooling the helium refrigerator coldbox, cooling photon beamline cryostats and cryogenic inserts in the HEPS. The nitrogen cryogenic plant has an average capacity about 50kW at 80K in the HEPS phase I. The nitrogen cryogenic plant is mainly included of nitrogen cycle refrigerator system at 7000W@90K and 100Nm3/h, two liquid nitrogen tanks and cryogenic fluid distribution tube network. The HEPS project engineering implementation has started at June 2019 and will be finished in the end of 2025. The Schematic diagram, status and recent machines commissioning of the cryogenic system are described in this paper.
| Submitters Country | China |
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