The dipole magnet of the China Spallation Neutron Source(CSNS) Rapid-cycling Synchrotron(RCS) will be operated at a 25 Hz sinusoidal alternating current which causes severe vibration.The vibration will influence the l...The dipole magnet of the China Spallation Neutron Source(CSNS) Rapid-cycling Synchrotron(RCS) will be operated at a 25 Hz sinusoidal alternating current which causes severe vibration.The vibration will influence the long-term safety and reliable operation of the dipole magnet.By taking the dipole magnet and magnetic measurement girder as specific model system,a method for analyzing and studying the dynamic characteristic of the system is put forward by combining theoretical calculation with experimental testing.This paper established the mechanical model of the system,and the top six step natural frequency and vibration mode were obtained through theoretical modal analysis(ANSYS).Then according to testing modal analysis,the natural frequency,damping ratios and vibration mode of the system structure were obtained too.The theoretical modal analysis results coincide with the experimental testing results.Besides,the 6th step natural frequency is close to the exciting frequency of the magnet,so the resonance phenomenon may take place at the actual working conditions.The dynamic characteristic data of the structure can provide an analysis basis for the further study and the formal dipole magnet girder optimal design of RCS.展开更多
According to the requirements for the beam collimation system of the rapid cycling synchrotron(RCS)of China Spallation Neutron Source(CSNS),the main structure of a scraper of primary collimator is made by W/Cu brazing...According to the requirements for the beam collimation system of the rapid cycling synchrotron(RCS)of China Spallation Neutron Source(CSNS),the main structure of a scraper of primary collimator is made by W/Cu brazing,in which the thickness of tungsten slice is 0.17 mm.In order to get the best mechanical properties,the brazing temperature is suggested to be controlled under the recrystallization temperature of tungsten,while the recrystallization temperature is affected directly by the thickness of tungsten.Because of little research and application on the brazing of thin tungsten slice of 0.17 mm and copper,tensile tests are done to get the mechanical properties of tungsten slices which experience different brazing temperatures.In keeping the inner relationships between the mechanical properties and temperature,another experiment is done by using SEM to scan the microstructures including the size and distribution of crystals.Finally we determine the recrystallization temperature of tungsten slice of 0.17 mm,and get the best parameters of W/Cu brazing for scrapers of primary collimator in CSNS/RCS.展开更多
文摘The dipole magnet of the China Spallation Neutron Source(CSNS) Rapid-cycling Synchrotron(RCS) will be operated at a 25 Hz sinusoidal alternating current which causes severe vibration.The vibration will influence the long-term safety and reliable operation of the dipole magnet.By taking the dipole magnet and magnetic measurement girder as specific model system,a method for analyzing and studying the dynamic characteristic of the system is put forward by combining theoretical calculation with experimental testing.This paper established the mechanical model of the system,and the top six step natural frequency and vibration mode were obtained through theoretical modal analysis(ANSYS).Then according to testing modal analysis,the natural frequency,damping ratios and vibration mode of the system structure were obtained too.The theoretical modal analysis results coincide with the experimental testing results.Besides,the 6th step natural frequency is close to the exciting frequency of the magnet,so the resonance phenomenon may take place at the actual working conditions.The dynamic characteristic data of the structure can provide an analysis basis for the further study and the formal dipole magnet girder optimal design of RCS.
基金supported by China Spallation Neutron Source(CSNS)
文摘According to the requirements for the beam collimation system of the rapid cycling synchrotron(RCS)of China Spallation Neutron Source(CSNS),the main structure of a scraper of primary collimator is made by W/Cu brazing,in which the thickness of tungsten slice is 0.17 mm.In order to get the best mechanical properties,the brazing temperature is suggested to be controlled under the recrystallization temperature of tungsten,while the recrystallization temperature is affected directly by the thickness of tungsten.Because of little research and application on the brazing of thin tungsten slice of 0.17 mm and copper,tensile tests are done to get the mechanical properties of tungsten slices which experience different brazing temperatures.In keeping the inner relationships between the mechanical properties and temperature,another experiment is done by using SEM to scan the microstructures including the size and distribution of crystals.Finally we determine the recrystallization temperature of tungsten slice of 0.17 mm,and get the best parameters of W/Cu brazing for scrapers of primary collimator in CSNS/RCS.
