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1、CSNS cryogenic system,Institute of High Energy PhysicsGuoping Wang()March 31,2023,Contents,Introduction of CSNS cryogenic systemEngineering progress of CSNS cryogenic systemSummary,3,CSNS Overview,CSNS is designed to accelerate proton beam pulses to 1.6 GeV kinetic energy at 25 Hz repetition rate,st
2、riking a solid metal target to produce spallation neutrons.The accelerator is designed to deliver a beam power of 100 kW.,Aerialphoto,2015-11-17,4,Requirements of CSNS cryogenic system,CSNS cryogenic system provides hydrogen to keep the two moderators at 20K.Dynamic heat load:DM:400W(25%margin)CM:30
3、0W(25%margin),CSNS cryogenic system,Mission of CSNS cryogenic system:Provide 20 K cryogenic hydrogen to moderator;Temperature difference is lower than 3 K between the entrance and exit of hydrogen moderator;Concentration of para-hydrogen is higher than 99%.,Safety,reliable,and stable operation of cr
4、yogenic system.,Layout of CSNS cryogenic system,Compressor room,Gas room,Hydrogen room,Refrigerator room,Tank area,Target station,Hydrogen cryogenic transfer lines,CSNS cryogenic system,Flowchart of CSNS cryogenic system,Helium refrigerator,2200 W20 K,purchased from Linde,has arrived at CSNS cite.Ac
5、ceptance test will be performed in June 2016.,Compressor,Purifier/Absorber,Helium cold box and the control cabinet,Key equipment in hydrogen loop:Two hydrogen circulators One hydrogen-helium heat exchanger One hydrogen heater One ortho-para hydrogen convertor One accumulatorAll equipment have been p
6、urchased or developed in 2015.,Hydrogen cold box,Accumulator cold box,Cryogenic hydrogen system adopted Double cold boxes:one hydrogen cold box one accumulator cold box,In one case,the accumulator breaks out,it will be much more convenient to remove and replace.,Complete assembly of hydrogen cold bo
7、x and accumulator cold box in 2015.,Hydrogen cold box,Accumulator cold box,Engineering progress,Hydraulic test of cryogenic hydrogen circulatorTested with 120 K cryogenic nitrogen gas,Cooling test of hydrogen cold boxFilling liquid nitrogen in the helium-side,and use helium instead of hydrogen in th
8、e hydrogen loop.Within 2 hours,maximum temperature in hydrogen cold box cooled down to 90 K.,Cool down process,Man-machine interface,Cooling test of accumulator cold boxFilling liquid nitrogen in the hydrogen-side,and simulate the pressure fluctuation by helium gas.Connect helium gas cylinders in th
9、e helium-side,to provide stable back pressure(1.5 MPa).,Cryogenic transfer lines,1.Two double-channel cryogenic hydrogen transfer lines,40 meters per one.2.Six single-channel cryogenic hydrogen transfer lines3.Two single-channel cryogenic helium transfer lines,Layout of cryogenic transfer lines,Sect
10、ional view of double-channel cryogenic transfer lines,Cryogenic transfer lines,1.Completed prefabricate sections of cryogenic transfer lines.2.Installed 12 m vertical part in January 2016.,Interface of cryogenic transfer lines between cryogenic system and moderator,Vertical part of cryogenic transfe
11、r lines,Summary,Acceptance test of helium refrigerator in June 2016.Commissioning of cryogenic system in the end of 2016.Joint commissioning with moderator system.,This year,Manufactured hydrogen cold box and accumulator cold box.Successful tested hydrogen cold box and the accumulator cold box with liquid nitrogen.Finished structural design and prefabricated sections of cryogenic transfer.,Present,Thank you！,
