1、CSNS cryogenic systemInstitute of High Energy PhysicsGuoping Wang()December 5,2022散裂中子源进展汇报 December 5,2022Contents Introduction of CSNS cryogenic system Engineering progress of CSNS cryogenic system Summary散裂中子源进展汇报 December 5,20223CSNS OverviewCSNS is designed to accelerate proton beam pulses to 1
2、.6 GeV kinetic energy at 25 Hz repetition rate,striking a solid metal target to produce spallation neutrons.The accelerator is designed to deliver a beam power of 100 kW.Aerial photo,2015-11-17散裂中子源进展汇报 December 5,20224Requirements of CSNS cryogenic system CSNS cryogenic system provides hydrogen to
3、keep the two moderators at 20K.Dynamic heat load:DM:400W(25%margin)CM:300W(25%margin)散裂中子源进展汇报 December 5,2022CSNS cryogenic systemMission 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 moderato
4、r;Concentration of para-hydrogen is higher than 99%.Safety,reliable,and stable operation of cryogenic system.散裂中子源进展汇报 December 5,2022Layout of CSNS cryogenic systemCompressor roomGas roomHydrogen roomRefrigerator roomTank areaTarget stationHydrogen cryogenic transfer lines散裂中子源进展汇报 December 5,2022C
5、SNS cryogenic systemFlowchart of CSNS cryogenic system散裂中子源进展汇报 December 5,2022Helium refrigerator,2200 W20 K,purchased from Linde,has arrived at CSNS cite.Acceptance test will be performed in June 2016.CompressorPurifier/AbsorberHelium cold box and the control cabinet散裂中子源进展汇报 December 5,2022Key eq
6、uipment in hydrogen loop:Two hydrogen circulators One hydrogen-helium heat exchanger One hydrogen heater One ortho-para hydrogen convertor One accumulatorAll equipment have been purchased or developed in 2015.Hydrogen circulatorHydrogen-helium heat exchangerHydrogen heater and O-P convertorAccumulat
7、or散裂中子源进展汇报 December 5,2022Hydrogen cold boxAccumulator cold boxCryogenic 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.散裂中子源进展汇报 December 5,2022Complete assembly o
8、f hydrogen cold box and accumulator cold box in 2015.Hydrogen cold boxAccumulator cold box散裂中子源进展汇报 December 5,2022Engineering progressHydraulic test of cryogenic hydrogen circulatorTested with 120 K cryogenic nitrogen gasDesign parametersValueWorking pressure1.5 MPaInlet temperature20 KFlow rate1 l
9、/sPressure head0.1 MPa散裂中子源进展汇报 December 5,2022Cooling test of hydrogen cold boxFilling liquid nitrogen in the helium-side,and use helium instead of hydrogen in the hydrogen loop.Within 2 hours,maximum temperature in hydrogen cold box cooled down to 90 K.Cool down processMan-machine interface散裂中子源进展
10、汇报 December 5,2022Cooling test of accumulator cold boxFilling liquid nitrogen in the hydrogen-side,and simulate the pressure fluctuation by helium gas.Connect helium gas cylinders in the helium-side,to provide stable back pressure(1.5 MPa).散裂中子源进展汇报 December 5,2022Cryogenic transfer lines1.Two doubl
11、e-channel cryogenic hydrogen transfer lines,40 meters per one.2.Six single-channel cryogenic hydrogen transfer lines3.Two single-channel cryogenic helium transfer linesLayout of cryogenic transfer linesSectional view of double-channel cryogenic transfer lines散裂中子源进展汇报 December 5,2022Cryogenic transf
12、er lines1.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 moderatorVertical part of cryogenic transfer lines散裂中子源进展汇报 December 5,2022Summaryl Acceptance test of helium refrig
13、erator in June 2016.l Commissioning of cryogenic system in the end of 2016.l Joint commissioning with moderator system.This yearl Manufactured hydrogen cold box and accumulator cold box.Successful tested hydrogen cold box and the accumulator cold box with liquid nitrogen.l Finished structural design and prefabricated sections of cryogenic transfer.PresentThank you！
