The stability of the plane grating monochromator in the Hefei Advanced Light Facility is highly important for beamline focusing,with angular vibration being a key indicator for assessing its stability.This paper propo...The stability of the plane grating monochromator in the Hefei Advanced Light Facility is highly important for beamline focusing,with angular vibration being a key indicator for assessing its stability.This paper proposes an elastic fitting method based on fifth-order polynomial fitting for the precise analysis of microangular vibrations on grating surfaces.Compared with the traditional rigid body method,this method fully considers the three major elastic characteristics exhibited by optical components during vibration:significant phase differences,nonuniform deformation gradients,and spatial distribution differences in angular deformation.The research results indicate that this method can accurately reflect the actual vibration state of the grating surface,not only enabling the quantitative prediction of local angular microvibration but also establishing a reliable theoretical analysis framework for the stability assessment of high-precision instruments.展开更多
The Hefei Advanced Light Facility(HALF)proposed by the National Synchrotron Radiation Laboratory is a green-field vacuum ultraviolet and soft X-ray diffraction-limited storage ring light source with a beam energy of 2...The Hefei Advanced Light Facility(HALF)proposed by the National Synchrotron Radiation Laboratory is a green-field vacuum ultraviolet and soft X-ray diffraction-limited storage ring light source with a beam energy of 2.2 GeV and emittance goal of less than 100 pm rad.Inspired by the ESRF-EBS hybrid multi-bend achromat(HMBA),SLS-2,and Diamond-II lattices,we have proposed and designed a modified H6BA lattice as the baseline lattice of the HALF storage ring with 20 identical cells and a natural emittance of approximately 86 pm rad.In this paper,three other types of HMBA lattices including two H7BA lattices and a H6BA lattice are designed for HALF with the same number of cells.The main storage ring proper-ties of these four HMBA lattices are compared.Because the intra-beam scattering(IBS)effect is significant in the HALF storage ring,we calculate and compare the equilibrium emittances of the four lattices with IBS included.These comparisons show that the present modified H6BA lattice,which has a relatively low equilibrium emittance and more straight sections,is preferred for the HALF storage ring after a comprehensive consideration.展开更多
The third harmonic superconducting cryomodule is being designed for the Shanghai High repetition rate XFEL and Extreme light facility(SHINE)project,which is under construction.In contrast to the European X-ray Free El...The third harmonic superconducting cryomodule is being designed for the Shanghai High repetition rate XFEL and Extreme light facility(SHINE)project,which is under construction.In contrast to the European X-ray Free Electron Laser(E-XFEL)project,the 3.9 GHz cryomodules in the SHINE project will operate in the continuous wave regime with higher radio frequency average power for both cavities and couplers.We propose a 3.9 GHz fundamental power coupler with an adjustable antenna length,for satisfying the SHINE project requirements.Here,we describe the 3.9 GHz fundamental power coupler's design considerations and power requirements for various operating modes of the SHINE Linac.We also present the results of the radio frequency simulation and optimization,including the studies on multipacting and thermal analysis of the proposed 3.9 GHz coupler.展开更多
A corrugated structure is built and tested on many FEL facilities,providing a'dechirper'mechanism for eliminating energy spread upstream of the undulator section of X-ray FELs.The wakefield effects are here st...A corrugated structure is built and tested on many FEL facilities,providing a'dechirper'mechanism for eliminating energy spread upstream of the undulator section of X-ray FELs.The wakefield effects are here studied for the beam dechirper at the Shanghai high repetition rate XFEL and extreme light facility(SHINE),and compared with analytical calculations.When properly optimized,the energy spread is well compensated.The transverse wakefield effects are also studied,including the dipole and quadrupole effects.By using two orthogonal dechirpers,we confirm the feasibility of restraining the emittance growth caused by the quadrupole wakefield.A more efficient method is thus proposed involving another pair of orthogonal dechirpers.展开更多
Purpose The Hefei Advanced Light Facility(HALF),a fourth-generation synchrotron radiation source utilizing diffraction-limited storage ring technology in the low-energy regime,imposes stringent requirements on the per...Purpose The Hefei Advanced Light Facility(HALF),a fourth-generation synchrotron radiation source utilizing diffraction-limited storage ring technology in the low-energy regime,imposes stringent requirements on the performance and reliability of its network system.This paper details the network topology design for the HALF,aiming to meet these rigorous demands.Methods By implementing virtual local area network(VLAN)technology,the overall network is segmented into several independent subnets,achieving network isolation,and effectively enhancing security and stability.Additionally,a demilitarized zone(DMZ)was established,with security measures such as firewalls and antivirus software deployed to mitigate potential security threats.A network monitoring system based on the open-source software Zabbix was developed and functionally tested in the Hefei Light Source(HLS),validating its capability to effectively perform network monitoring and abnormal alarm functions.Results These measures ensure that the designed network system not only meets the specific requirements of HALF,but also provides robust support for its stable and efficient operation,ensuring the project achieves its predetermined goals.Conclusion The HALF control system employs a dual-network architecture with VLAN-segmented control subnets and integrated virtualization technologies,complemented by robust security measures,to establish a secure,efficient,and scalable infrastructure that ensures continuous system stability while maintaining future-focused network monitoring capabilities.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12372187 and 12402228)Fundamental Research Funds for the Central Universities(Grant No.WK2480000010)+3 种基金Fellowship of China Postdoctoral Science Foundation(Grant No.2024M753103)CAS Talent Introduction Program(Grant No.KJ2090007006)Anhui Provincial Natural Science Foundation(Grant No.2408085QA014)National Synchrotron Radiation Laboratory Joint Foundation(Grant Nos.KY2090000097 and KY2090000124).
文摘The stability of the plane grating monochromator in the Hefei Advanced Light Facility is highly important for beamline focusing,with angular vibration being a key indicator for assessing its stability.This paper proposes an elastic fitting method based on fifth-order polynomial fitting for the precise analysis of microangular vibrations on grating surfaces.Compared with the traditional rigid body method,this method fully considers the three major elastic characteristics exhibited by optical components during vibration:significant phase differences,nonuniform deformation gradients,and spatial distribution differences in angular deformation.The research results indicate that this method can accurately reflect the actual vibration state of the grating surface,not only enabling the quantitative prediction of local angular microvibration but also establishing a reliable theoretical analysis framework for the stability assessment of high-precision instruments.
基金the Fundamental Research Funds for the Central Universities(No.WK2310000107)the National Key Research and Development Program of China(No.2016YFA0402000)National Natural Science Foundation of China(Nos.12205299,11875259,12105284).
文摘The Hefei Advanced Light Facility(HALF)proposed by the National Synchrotron Radiation Laboratory is a green-field vacuum ultraviolet and soft X-ray diffraction-limited storage ring light source with a beam energy of 2.2 GeV and emittance goal of less than 100 pm rad.Inspired by the ESRF-EBS hybrid multi-bend achromat(HMBA),SLS-2,and Diamond-II lattices,we have proposed and designed a modified H6BA lattice as the baseline lattice of the HALF storage ring with 20 identical cells and a natural emittance of approximately 86 pm rad.In this paper,three other types of HMBA lattices including two H7BA lattices and a H6BA lattice are designed for HALF with the same number of cells.The main storage ring proper-ties of these four HMBA lattices are compared.Because the intra-beam scattering(IBS)effect is significant in the HALF storage ring,we calculate and compare the equilibrium emittances of the four lattices with IBS included.These comparisons show that the present modified H6BA lattice,which has a relatively low equilibrium emittance and more straight sections,is preferred for the HALF storage ring after a comprehensive consideration.
基金supported by Shanghai Municipal Science and Technology Major Project(No.2017SHZDZX02)。
文摘The third harmonic superconducting cryomodule is being designed for the Shanghai High repetition rate XFEL and Extreme light facility(SHINE)project,which is under construction.In contrast to the European X-ray Free Electron Laser(E-XFEL)project,the 3.9 GHz cryomodules in the SHINE project will operate in the continuous wave regime with higher radio frequency average power for both cavities and couplers.We propose a 3.9 GHz fundamental power coupler with an adjustable antenna length,for satisfying the SHINE project requirements.Here,we describe the 3.9 GHz fundamental power coupler's design considerations and power requirements for various operating modes of the SHINE Linac.We also present the results of the radio frequency simulation and optimization,including the studies on multipacting and thermal analysis of the proposed 3.9 GHz coupler.
基金supported by the Youth Innovation Promotion Association CAS(Nos.2018300 and 2021282)the National Key Research and Development Program of China(No.2018YFE0103100)the National Natural Science Foundation of China(No.11935020)。
文摘A corrugated structure is built and tested on many FEL facilities,providing a'dechirper'mechanism for eliminating energy spread upstream of the undulator section of X-ray FELs.The wakefield effects are here studied for the beam dechirper at the Shanghai high repetition rate XFEL and extreme light facility(SHINE),and compared with analytical calculations.When properly optimized,the energy spread is well compensated.The transverse wakefield effects are also studied,including the dipole and quadrupole effects.By using two orthogonal dechirpers,we confirm the feasibility of restraining the emittance growth caused by the quadrupole wakefield.A more efficient method is thus proposed involving another pair of orthogonal dechirpers.
基金funded by the National Science Foundation for Young Scientists of China(Grant No.12205295)the Fundamental Research Funds for the Central Universities(WK2310000112)the National Key Programme for S&T Research and Development for Young Scientists(Grant No.SQ2023YFA1600032).
文摘Purpose The Hefei Advanced Light Facility(HALF),a fourth-generation synchrotron radiation source utilizing diffraction-limited storage ring technology in the low-energy regime,imposes stringent requirements on the performance and reliability of its network system.This paper details the network topology design for the HALF,aiming to meet these rigorous demands.Methods By implementing virtual local area network(VLAN)technology,the overall network is segmented into several independent subnets,achieving network isolation,and effectively enhancing security and stability.Additionally,a demilitarized zone(DMZ)was established,with security measures such as firewalls and antivirus software deployed to mitigate potential security threats.A network monitoring system based on the open-source software Zabbix was developed and functionally tested in the Hefei Light Source(HLS),validating its capability to effectively perform network monitoring and abnormal alarm functions.Results These measures ensure that the designed network system not only meets the specific requirements of HALF,but also provides robust support for its stable and efficient operation,ensuring the project achieves its predetermined goals.Conclusion The HALF control system employs a dual-network architecture with VLAN-segmented control subnets and integrated virtualization technologies,complemented by robust security measures,to establish a secure,efficient,and scalable infrastructure that ensures continuous system stability while maintaining future-focused network monitoring capabilities.
