Spring-8是建在日本兵库县西部的播磨科学公园都市的第三代同步辐射实验设备,它是以Super Photon Ring with8GeV的头一个字命名的。此设备是日本理化研究所、原子能研究所共同完成的。此项计划开始于1984年左右,1997年首次观测到辐射光...Spring-8是建在日本兵库县西部的播磨科学公园都市的第三代同步辐射实验设备,它是以Super Photon Ring with8GeV的头一个字命名的。此设备是日本理化研究所、原子能研究所共同完成的。此项计划开始于1984年左右,1997年首次观测到辐射光束,同年10月开始提供使用。日本约50年前就利用同步加速器在可见光波段实验观测到辐射光。对于加速器来说,辐射光是能量损耗的原因,但其能量范围适于物性测量,因此,70年代(第1代)开始以寄生形式利用高能量加速器做辐射光实验,并着眼于其有效性,从80年代(第2代)开始建造专用的存储环,并利用辐射光做实验。因第2代用偏转电磁铁作主要光源。展开更多
Under three-dimensional plane geometrical constraints ( X,Y,θ ), with two asymmetric achromatic sections, the combined three-section structural FODO-like magnet lattice design is adopted and finely optimized in the S...Under three-dimensional plane geometrical constraints ( X,Y,θ ), with two asymmetric achromatic sections, the combined three-section structural FODO-like magnet lattice design is adopted and finely optimized in the SSRF electron-beam transfer lines. The magnet lattice has high flexibility and robustness, and the Courant–Snyder parameters can be easily adjusted within a wide range to meet the requirements of transmission and injection for different operation modes of the linear accelerator, booster synchrotron, and storage ring. In this article, the main parameters of the linear optics design of the SSRF electron-beam transfer lines are described, involving the physical design criteria, the total geometrical layout, the magnet lattice, and the beam Courant–Snyder parameters matching. The studies of the variant beam dynamic simulation program calculations show that the design purpose of the efficient beam transmission and injection will be basically achieved.展开更多
Beam lifetime of a synchrotron is dominated by Touschek scattering.In the beamline Phase II project of Shanghai synchrotron radiation facility,a passive third harmonic cavity is to be installed for bunch lengthening a...Beam lifetime of a synchrotron is dominated by Touschek scattering.In the beamline Phase II project of Shanghai synchrotron radiation facility,a passive third harmonic cavity is to be installed for bunch lengthening and instability suppressing.In this paper,the beam dynamics of the cavity is investigated.The parameters of passive operation are optimized to cancel the slope of RF voltage and lengthen the bunches.The Touschek lifetime increases are estimated for optimum and non-optimum voltage flattening.A tolerance of the operation is studied in case that there is a shift on detuning angle.The effect caused by reduction in harmonic voltage generated by lengthened bunch distribution is also estimated using iteration method.An increase in synchrotron frequency spread due to nonlinearity of the voltage giving to the bunch is found by using tracking simulation.This spread can help in damping coupled bunch instability through Landau damping.展开更多
Fast beam profile measurement is important in fast beam dynamic behavior investigations. A bunch-bybunch beam size measurement system, which is presently used to measure horizontal profile, has been developed at the S...Fast beam profile measurement is important in fast beam dynamic behavior investigations. A bunch-bybunch beam size measurement system, which is presently used to measure horizontal profile, has been developed at the Shanghai Synchrotron Radiation Facility(SSRF) and is capable of measuring bunches within a separation of 2 ns.The system is based on a direct-imaging optical system and high-speed photomultiplier array detector. A high-bandwidth linear signal amplifier and acquisition module have also been designed to process bunch-by-bunch multichannel signals from the detector. The software resampling technique and principal component analysis method were developed to obtain the synchronized data and enhance the signal-to-noise ratio. The fast injection of transients was successfully captured and analyzed. Moreover, the bunchby-bunch positions and sizes exhibited strong oscillation after the injection at the horizontal betatron oscillation frequency of the SSRF storage ring, and this demonstrated the bunch-by-bunch measurement capability of our system.展开更多
The macromolecular crystallography beamline BL17U1 at the Shanghai Synchrotron Radiation Facility(SSRF) is the first dedicated macromolecular crystallography(MX) beamline at a third-generation synchrotron in China. It...The macromolecular crystallography beamline BL17U1 at the Shanghai Synchrotron Radiation Facility(SSRF) is the first dedicated macromolecular crystallography(MX) beamline at a third-generation synchrotron in China. It utilizes an in-vacuum undulator as a source and is energy-tunable from 5 to 18 ke V. The beamline was commissioned and opened for users in April 2009. The experimental station was upgraded in 2011 with an advanced detector, a high precision goniometer and an automatic sample exchanger for high efficient and high-throughput data collection of protein crystals. The current set-up allows for remote operation of sample mounting, centering and data collection of pre-frozen crystals. In recent two years, the number of PDB depositions from this beamline exceeds 330 each year. In this paper, we describe the complete BL17U1 beamline with upgraded end station and how it is managed for user community.展开更多
The Shanghai Synchrotron Radiation Facility (SSRF) is a proposed 3rd generation light source with 3.5 GeV in energy. It is composed of 20 DBA cells resulting in a ring that is about 10 nm(rad in emittance and 396 m in...The Shanghai Synchrotron Radiation Facility (SSRF) is a proposed 3rd generation light source with 3.5 GeV in energy. It is composed of 20 DBA cells resulting in a ring that is about 10 nm(rad in emittance and 396 m in circumference, and provides 10 straight sections of 7.24 m and other 10 straight sections of 5.0 m for the inclusion of insertion devices, injection components and RF cavities. The lattice has high flexibility, and the tunes and beta functions can be easily adjusted within a wide range to meet the requirements for different operation modes, including high beta mode and hybrid beta mode with and/or without dispersion in straight sections. In this paper, the results of linear optics design and dynamic aperture study are presented.展开更多
Beam position monitors(BPMs)have been widely used in all kinds of measurement systems,feedback systems and other areas in particle accelerator field these days.The malfunction of a single BPM can cause serious consequ...Beam position monitors(BPMs)have been widely used in all kinds of measurement systems,feedback systems and other areas in particle accelerator field these days.The malfunction of a single BPM can cause serious consequences such as the failure of the orbit feedback and the transverse feedback.A troubleshooting has been made to prevent the defective BPMs from affecting the accuracy and stability of the storage ring in Shanghai Synchrotron Radiation Facility(SSRF).Different types of malfunctions have been successfully identified by using the idea of principal component analysis(PCA).展开更多
The control system of Shanghai Synchrotron Radiation Facility (SSRF) is a large-scale distributed real-time control system. It involves many types and large amounts of real-time data access during the operating. Datab...The control system of Shanghai Synchrotron Radiation Facility (SSRF) is a large-scale distributed real-time control system. It involves many types and large amounts of real-time data access during the operating. Database system has wide application prospects in the large-scale accelerator control system. It is the future development direction of the accelerator control system, to replace the differently dedicated data structures with the mature standardized database system. This article discusses the application feasibility of database system in accelerators based on the database interface technology, real-time data access testing, and system optimization research and to establish the foundation of the wide scale application of database system in the SSRF accelerator control system. Based on the database interface technology, real-time data access testing and system optimization research, this article will introduce the application feasibility of database system in accelerators, and lay the foundation of database system application in the SSRF accelerator control system.展开更多
Conventional radiotherapy remains to be one of the most useful treatments for cancer, but it is not the best strategy to maximize the effects on the tumors and minimize the damage to the surrounding tissues because of...Conventional radiotherapy remains to be one of the most useful treatments for cancer, but it is not the best strategy to maximize the effects on the tumors and minimize the damage to the surrounding tissues because of its physical and radiobiological characteristics. Synchrotrons represent a unique method for an innovative anti-cancer treatment due to the physical features (i.e. high fluence, tunable and collimated) of X-ray induced by synchrotron, so photon activation therapy and microbeam radiation treatment have been developed, but it is very imperative to understand the radiobiological mechanism of synchrotron radiation before we could transfer the strategy into the clinic. This paper is to summary the results of in vitro and in vivo experiments with synchrotron radiation, and review the advances of molecular and cellular radiobiological mechanism involved in synchrotron radiation. Since Shanghai Synchrotron Radiation Facility (SSRF) has produced the first synchrotron, it will provide the unique opportunity for the study of radiobiological effects of synchrotron radiation.展开更多
The safety shutter of the SR (synchrotron radiation) facility located at the front end of the facility is an in- dispensable component for radiation protection. Its thickness is decided by the gas bremsstrahlung produ...The safety shutter of the SR (synchrotron radiation) facility located at the front end of the facility is an in- dispensable component for radiation protection. Its thickness is decided by the gas bremsstrahlung produced in the SR facility storage ring by the interaction of electrons with the residual gas molecules in the vacuum chamber of the storage ring. In the calculation, the 3.5 GeV, 300 mA electron beam and a 15 m long insertion-device straight section (0.133 μ Pa) were taken into account, and the safety shutter was assumed to be located 12 m away from the end of the straight section. The EGSnrc code based on the Monte-Carlo method and empirical formulas were used, respectively, to calculate the thickness to satisfy the shielding requirement of the safety shutter at the front end of the SR facility, and the results were compared and the availability of EGSnrc was proved.展开更多
The wake field, impedance and output signal for SSRF BPM have been calculated and analyzed by us-ing the numerical simulation code of MAFIA. The narrow-band impedance of BPM arising from formation of reso-nance in its...The wake field, impedance and output signal for SSRF BPM have been calculated and analyzed by us-ing the numerical simulation code of MAFIA. The narrow-band impedance of BPM arising from formation of reso-nance in its cavity like structure either is harmful to beam or limits the performance of BPM itself, and should be re-duced to tolerable levels. The calculated results show that there are three main peaks in the impedance spectrum ofthe SSRF BPM prototype, and two of which are above the limit. After lots of simulations for different shapes of theBPM button, a new structure of SSRF BPM have been found, and there is only one main peak, which is under thelimit, in the impedance spectrum. Its output signal also meets the requirement.展开更多
Eight 500 MHz cavities are applied in the storage ring of the Shanghai Synchrotron Radiation Factility (SSRF). In order to tune the cavities for different changing parameters and operation modes, the control system is...Eight 500 MHz cavities are applied in the storage ring of the Shanghai Synchrotron Radiation Factility (SSRF). In order to tune the cavities for different changing parameters and operation modes, the control system is es- sential for operations. The tuning is achieved by synchronizing the drive signal and the cavity probe signal. The error signal defined as their subtraction is amplified and used to drive a stepping motor, which in turn moves a metallic plunger in or out of the cavity by programmable logic controller (PLC). The tune speed is set to be 1kHz/s.展开更多
文摘Spring-8是建在日本兵库县西部的播磨科学公园都市的第三代同步辐射实验设备,它是以Super Photon Ring with8GeV的头一个字命名的。此设备是日本理化研究所、原子能研究所共同完成的。此项计划开始于1984年左右,1997年首次观测到辐射光束,同年10月开始提供使用。日本约50年前就利用同步加速器在可见光波段实验观测到辐射光。对于加速器来说,辐射光是能量损耗的原因,但其能量范围适于物性测量,因此,70年代(第1代)开始以寄生形式利用高能量加速器做辐射光实验,并着眼于其有效性,从80年代(第2代)开始建造专用的存储环,并利用辐射光做实验。因第2代用偏转电磁铁作主要光源。
基金Supported by National Important Scientific Project "Shanghai Synchrotron Radiation Facility".
文摘Under three-dimensional plane geometrical constraints ( X,Y,θ ), with two asymmetric achromatic sections, the combined three-section structural FODO-like magnet lattice design is adopted and finely optimized in the SSRF electron-beam transfer lines. The magnet lattice has high flexibility and robustness, and the Courant–Snyder parameters can be easily adjusted within a wide range to meet the requirements of transmission and injection for different operation modes of the linear accelerator, booster synchrotron, and storage ring. In this article, the main parameters of the linear optics design of the SSRF electron-beam transfer lines are described, involving the physical design criteria, the total geometrical layout, the magnet lattice, and the beam Courant–Snyder parameters matching. The studies of the variant beam dynamic simulation program calculations show that the design purpose of the efficient beam transmission and injection will be basically achieved.
基金supported by the National Key Research and Development Program of China(No.2016YFA0402001)
文摘Beam lifetime of a synchrotron is dominated by Touschek scattering.In the beamline Phase II project of Shanghai synchrotron radiation facility,a passive third harmonic cavity is to be installed for bunch lengthening and instability suppressing.In this paper,the beam dynamics of the cavity is investigated.The parameters of passive operation are optimized to cancel the slope of RF voltage and lengthen the bunches.The Touschek lifetime increases are estimated for optimum and non-optimum voltage flattening.A tolerance of the operation is studied in case that there is a shift on detuning angle.The effect caused by reduction in harmonic voltage generated by lengthened bunch distribution is also estimated using iteration method.An increase in synchrotron frequency spread due to nonlinearity of the voltage giving to the bunch is found by using tracking simulation.This spread can help in damping coupled bunch instability through Landau damping.
基金supported by the National Natural Science Foundation of China(No.11375255)
文摘Fast beam profile measurement is important in fast beam dynamic behavior investigations. A bunch-bybunch beam size measurement system, which is presently used to measure horizontal profile, has been developed at the Shanghai Synchrotron Radiation Facility(SSRF) and is capable of measuring bunches within a separation of 2 ns.The system is based on a direct-imaging optical system and high-speed photomultiplier array detector. A high-bandwidth linear signal amplifier and acquisition module have also been designed to process bunch-by-bunch multichannel signals from the detector. The software resampling technique and principal component analysis method were developed to obtain the synchronized data and enhance the signal-to-noise ratio. The fast injection of transients was successfully captured and analyzed. Moreover, the bunchby-bunch positions and sizes exhibited strong oscillation after the injection at the horizontal betatron oscillation frequency of the SSRF storage ring, and this demonstrated the bunch-by-bunch measurement capability of our system.
基金Supported by the Shanghai Synchrotron Radiation Facility Phase-Ⅰprojectthe Upgrading project of Chinese Academy of Sciences(2010)
文摘The macromolecular crystallography beamline BL17U1 at the Shanghai Synchrotron Radiation Facility(SSRF) is the first dedicated macromolecular crystallography(MX) beamline at a third-generation synchrotron in China. It utilizes an in-vacuum undulator as a source and is energy-tunable from 5 to 18 ke V. The beamline was commissioned and opened for users in April 2009. The experimental station was upgraded in 2011 with an advanced detector, a high precision goniometer and an automatic sample exchanger for high efficient and high-throughput data collection of protein crystals. The current set-up allows for remote operation of sample mounting, centering and data collection of pre-frozen crystals. In recent two years, the number of PDB depositions from this beamline exceeds 330 each year. In this paper, we describe the complete BL17U1 beamline with upgraded end station and how it is managed for user community.
文摘The Shanghai Synchrotron Radiation Facility (SSRF) is a proposed 3rd generation light source with 3.5 GeV in energy. It is composed of 20 DBA cells resulting in a ring that is about 10 nm(rad in emittance and 396 m in circumference, and provides 10 straight sections of 7.24 m and other 10 straight sections of 5.0 m for the inclusion of insertion devices, injection components and RF cavities. The lattice has high flexibility, and the tunes and beta functions can be easily adjusted within a wide range to meet the requirements for different operation modes, including high beta mode and hybrid beta mode with and/or without dispersion in straight sections. In this paper, the results of linear optics design and dynamic aperture study are presented.
基金Supported by National Natural Science Foundation of China(No.11075198)
文摘Beam position monitors(BPMs)have been widely used in all kinds of measurement systems,feedback systems and other areas in particle accelerator field these days.The malfunction of a single BPM can cause serious consequences such as the failure of the orbit feedback and the transverse feedback.A troubleshooting has been made to prevent the defective BPMs from affecting the accuracy and stability of the storage ring in Shanghai Synchrotron Radiation Facility(SSRF).Different types of malfunctions have been successfully identified by using the idea of principal component analysis(PCA).
基金Supported by Shanghai Synchrotron Radiation Facility project
文摘The control system of Shanghai Synchrotron Radiation Facility (SSRF) is a large-scale distributed real-time control system. It involves many types and large amounts of real-time data access during the operating. Database system has wide application prospects in the large-scale accelerator control system. It is the future development direction of the accelerator control system, to replace the differently dedicated data structures with the mature standardized database system. This article discusses the application feasibility of database system in accelerators based on the database interface technology, real-time data access testing, and system optimization research and to establish the foundation of the wide scale application of database system in the SSRF accelerator control system. Based on the database interface technology, real-time data access testing and system optimization research, this article will introduce the application feasibility of database system in accelerators, and lay the foundation of database system application in the SSRF accelerator control system.
基金Supported by Science and Technology Commission of Shanghai Municipality (NO.08411960600, NO.09JC1411900, NO.09411951100)
文摘Conventional radiotherapy remains to be one of the most useful treatments for cancer, but it is not the best strategy to maximize the effects on the tumors and minimize the damage to the surrounding tissues because of its physical and radiobiological characteristics. Synchrotrons represent a unique method for an innovative anti-cancer treatment due to the physical features (i.e. high fluence, tunable and collimated) of X-ray induced by synchrotron, so photon activation therapy and microbeam radiation treatment have been developed, but it is very imperative to understand the radiobiological mechanism of synchrotron radiation before we could transfer the strategy into the clinic. This paper is to summary the results of in vitro and in vivo experiments with synchrotron radiation, and review the advances of molecular and cellular radiobiological mechanism involved in synchrotron radiation. Since Shanghai Synchrotron Radiation Facility (SSRF) has produced the first synchrotron, it will provide the unique opportunity for the study of radiobiological effects of synchrotron radiation.
文摘The safety shutter of the SR (synchrotron radiation) facility located at the front end of the facility is an in- dispensable component for radiation protection. Its thickness is decided by the gas bremsstrahlung produced in the SR facility storage ring by the interaction of electrons with the residual gas molecules in the vacuum chamber of the storage ring. In the calculation, the 3.5 GeV, 300 mA electron beam and a 15 m long insertion-device straight section (0.133 μ Pa) were taken into account, and the safety shutter was assumed to be located 12 m away from the end of the straight section. The EGSnrc code based on the Monte-Carlo method and empirical formulas were used, respectively, to calculate the thickness to satisfy the shielding requirement of the safety shutter at the front end of the SR facility, and the results were compared and the availability of EGSnrc was proved.
文摘The wake field, impedance and output signal for SSRF BPM have been calculated and analyzed by us-ing the numerical simulation code of MAFIA. The narrow-band impedance of BPM arising from formation of reso-nance in its cavity like structure either is harmful to beam or limits the performance of BPM itself, and should be re-duced to tolerable levels. The calculated results show that there are three main peaks in the impedance spectrum ofthe SSRF BPM prototype, and two of which are above the limit. After lots of simulations for different shapes of theBPM button, a new structure of SSRF BPM have been found, and there is only one main peak, which is under thelimit, in the impedance spectrum. Its output signal also meets the requirement.
文摘Eight 500 MHz cavities are applied in the storage ring of the Shanghai Synchrotron Radiation Factility (SSRF). In order to tune the cavities for different changing parameters and operation modes, the control system is es- sential for operations. The tuning is achieved by synchronizing the drive signal and the cavity probe signal. The error signal defined as their subtraction is amplified and used to drive a stepping motor, which in turn moves a metallic plunger in or out of the cavity by programmable logic controller (PLC). The tune speed is set to be 1kHz/s.
