A foil–microchannel plate(MCP)detector,which uses electrostatic lenses and possesses both good position and timing resolutions,has been designed and simulated for beam diagnostics and mass measurements at the next-ge...A foil–microchannel plate(MCP)detector,which uses electrostatic lenses and possesses both good position and timing resolutions,has been designed and simulated for beam diagnostics and mass measurements at the next-generation heavy-ion-beam facility HIAF in China.Characterized by low energy loss and good performances of timing and position measurements,it would be located at focal planes in fragment separator HFRS for position monitoring,beam turning,Bq measurement,and trajectory reconstruction.Moreover,it will benefit the building-up of a magnetic-rigidity–energy-loss–time-offlight(BqDETOF)method at HFRS for high-precision in-flight particle identification of radioactive isotope beams on an event-by-event basis.Most importantly,the detector can be utilized for in-ring TOF and position measurements,beam-line TOF measurements at two achromatic foci,and position measurements at a dispersive focus of HFRS,thus making it possible to use two complementary mass measurement methods[isochronous mass spectrometry at the storage ring SRing and magnetic-rigidity–time-of-flight(BqTOF)at the beam-line HFRS]in one single experimental run.展开更多
The high-intensity heavy-ion accelerator facility(HIAF)is under design at the Institute of Modern Physics(IMP)and will provide an intense ion beam for nuclear physics,atomic mass measurement research,and other applica...The high-intensity heavy-ion accelerator facility(HIAF)is under design at the Institute of Modern Physics(IMP)and will provide an intense ion beam for nuclear physics,atomic mass measurement research,and other applications.As the main ring of HIAF,the BRing accumulates beams to high intensity and accelerates them to high energy.To achieve high intensities up to 1×10^(11)(^(238)U^(34+)),the injection gain of the BRing must be as high as 88.However,multiple multiturn injection supported by the electron cooling system takes a long time,causing substantial beam loss under a strong space charge effect.Hence,a two-plane painting injection scheme is proposed for beam accumulation in the BRing.This scheme uses a tilted injection septum and horizontal and vertical bump magnets to paint the beam into horizontal and vertical phase space simultaneously.In this paper,the two-plane painting injection parameters are optimized,and the resulting injection process is simulated using the Objective Ring Beam Injection and Tracking(ORBIT)code.An injection gain of up to 110.3 with a loss rate of 2:3%is achieved,meeting the requirements of BRing.展开更多
The research activities on warm dense matter driven by intense heavy ion beams at the new project High Intensity heavy-ion AcceleratorFacility (HIAF) are presented. The ion beam parameters and the simulated accessible...The research activities on warm dense matter driven by intense heavy ion beams at the new project High Intensity heavy-ion AcceleratorFacility (HIAF) are presented. The ion beam parameters and the simulated accessible state of matter at HIAF are introduced, respectively. Theprogresses of the developed diagnostics for warm dense matter research including high energy electron radiography, multiple-channel pyrometer,in-situ energy loss and charge state of ion detector are briefly introduced.展开更多
Purpose To protect accelerator devices from being damaged by high-power beam,a new beam dump system is under design for HIAF-BRing.Method Based on the optical characteristics,unwanted particles are safely deflected to ...Purpose To protect accelerator devices from being damaged by high-power beam,a new beam dump system is under design for HIAF-BRing.Method Based on the optical characteristics,unwanted particles are safely deflected to a specific internal absorber through a local bump orbit generated by active-discharging magnets,which is achieved by paralleling a bleeder resistor of 600 m�to two of dipole magnet power supplies.Results Taking alignment and multipolefield errors into account,discarded beam can be dumped within 5 ms with an efficiency of more than 99.8%at any operation stage.Conclusion The proposed beam dump solution satisfies the machine protection requirements for BRing and can provide a new idea for similar facilities.展开更多
A new accelerator complex, HIAF （the High Intensity Heavy Ion Accelerator Facility）, has been approved in China. It is designed to provide intense primary and radioactive ion beams for research in high energy densit...A new accelerator complex, HIAF （the High Intensity Heavy Ion Accelerator Facility）, has been approved in China. It is designed to provide intense primary and radioactive ion beams for research in high energy density physics, nuclear physics, atomic physics as well as other applications. In order to achieve a high intensity of up to 5× 10^11 ppp 23Su34＋, the Compression Ring （CRing） needs to stack more than 5 bunches transferred from the Booster Ring （BRing）. However, the normal bucket to bucket injection scheme can only achieve an intensity gain of 2, so an injection method, fixed barrier bucket （BB） supported by electron cooling, is proposed. To suppress the severe space charge effect during the stacking process, off-alignment is adopted in the cooler to control the transverse enfittance. In this paper, simulation and optimization with the BETACOOL program are presented.展开更多
Purpose The machine protection system(MPS)is an essential part of the BRing(Booster Ring)at the HIAF(High Intensity heavy ion Accelerator Facility)to protect the accelerator from possible accidents.The high accumulati...Purpose The machine protection system(MPS)is an essential part of the BRing(Booster Ring)at the HIAF(High Intensity heavy ion Accelerator Facility)to protect the accelerator from possible accidents.The high accumulation intensity and the complex operation mode of the BRing require MPS to respond quickly and operate stably.So,the detailed physical scheme of beam dump is proposed,and the corresponding simulation results are discussed in this paper.Method For this purpose,a multi-phased beam dump scheme based on the bipolar operation of fast extraction kicker magnets is proposed.The basic physical dimensions of the stoppers and energy deposited analysis have been calculated.Results and conclusion The multi-phased beam dump scheme is able to meet the engineering requirements,and the stopping efficiency can reach 100%for bunched beam.展开更多
High Intensity heavy-ion Accelerator Facility(HIAF)is designed by the Institute of Modern Physics,Chinese Academy of Sciences,which can accelerate particles form proton up to uranium.As shown in Fig.1,HIAF is composed...High Intensity heavy-ion Accelerator Facility(HIAF)is designed by the Institute of Modern Physics,Chinese Academy of Sciences,which can accelerate particles form proton up to uranium.As shown in Fig.1,HIAF is composed of the following parts:Superconducting Electron Cyclotron Resonance(SECR)ion source.展开更多
Control network is one of the most important supportingl condition in HIAF (High Intensity Heavy-ion Accelerator Facility) control system. Only in aids of the control network, operators can remotely control or monitor...Control network is one of the most important supportingl condition in HIAF (High Intensity Heavy-ion Accelerator Facility) control system. Only in aids of the control network, operators can remotely control or monitor all kinds of devices in the accelerator while sitting in the central control room to achieve real-time control.展开更多
For the purpose of better performance,running stability and efficiency of CiADS and HIAF Superconducting Proton linac system,2K superfluid helium will be adopted for superconducting cavity cooling due to its specific ...For the purpose of better performance,running stability and efficiency of CiADS and HIAF Superconducting Proton linac system,2K superfluid helium will be adopted for superconducting cavity cooling due to its specific properties,such as high thermal conductivity,low viscosity.展开更多
In the framework of the HIAF fragment separator,about 50 superconducting magnets using Canted-Cosine-Theta coil configuration will be installed.As a proof of concept,0.8 m long multipole prototype magnet has been desi...In the framework of the HIAF fragment separator,about 50 superconducting magnets using Canted-Cosine-Theta coil configuration will be installed.As a proof of concept,0.8 m long multipole prototype magnet has been designed and fabricated to demonstrate its feasibility.A summary of the main parameters is given in Table 1.展开更多
In the year 2018,our group mainly focused on two fields of studies.The first important work is High Energy Electron Radiography(HEER)research.Especially we focused on the Lanzhou HEER experimental platform setup.Anoth...In the year 2018,our group mainly focused on two fields of studies.The first important work is High Energy Electron Radiography(HEER)research.Especially we focused on the Lanzhou HEER experimental platform setup.Another one is the investigation on the high average current electron injector for Phase II of HIAF project and some pre-research schemes are planned.展开更多
The 100 kV electron cooler device is designed for the new project HIAF to improve beam quality in SRing[1,2].The design work of the electron gun and the collector for the cooler has been finished and the prototype has...The 100 kV electron cooler device is designed for the new project HIAF to improve beam quality in SRing[1,2].The design work of the electron gun and the collector for the cooler has been finished and the prototype has being manufactured in the workshop.The structures of the gun and collector are shown in Fig.1.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11605248,11605249,11605267,and 11805032.)
文摘A foil–microchannel plate(MCP)detector,which uses electrostatic lenses and possesses both good position and timing resolutions,has been designed and simulated for beam diagnostics and mass measurements at the next-generation heavy-ion-beam facility HIAF in China.Characterized by low energy loss and good performances of timing and position measurements,it would be located at focal planes in fragment separator HFRS for position monitoring,beam turning,Bq measurement,and trajectory reconstruction.Moreover,it will benefit the building-up of a magnetic-rigidity–energy-loss–time-offlight(BqDETOF)method at HFRS for high-precision in-flight particle identification of radioactive isotope beams on an event-by-event basis.Most importantly,the detector can be utilized for in-ring TOF and position measurements,beam-line TOF measurements at two achromatic foci,and position measurements at a dispersive focus of HFRS,thus making it possible to use two complementary mass measurement methods[isochronous mass spectrometry at the storage ring SRing and magnetic-rigidity–time-of-flight(BqTOF)at the beam-line HFRS]in one single experimental run.
基金supported by the National Natural Science Foundation of China(No.11505256)
文摘The high-intensity heavy-ion accelerator facility(HIAF)is under design at the Institute of Modern Physics(IMP)and will provide an intense ion beam for nuclear physics,atomic mass measurement research,and other applications.As the main ring of HIAF,the BRing accumulates beams to high intensity and accelerates them to high energy.To achieve high intensities up to 1×10^(11)(^(238)U^(34+)),the injection gain of the BRing must be as high as 88.However,multiple multiturn injection supported by the electron cooling system takes a long time,causing substantial beam loss under a strong space charge effect.Hence,a two-plane painting injection scheme is proposed for beam accumulation in the BRing.This scheme uses a tilted injection septum and horizontal and vertical bump magnets to paint the beam into horizontal and vertical phase space simultaneously.In this paper,the two-plane painting injection parameters are optimized,and the resulting injection process is simulated using the Objective Ring Beam Injection and Tracking(ORBIT)code.An injection gain of up to 110.3 with a loss rate of 2:3%is achieved,meeting the requirements of BRing.
基金This work was supported by the National Science Foun-dation of China(NSFC,Grant Nos.U1532263,11205225,11275241,11375034,11505248 and 11275238).
文摘The research activities on warm dense matter driven by intense heavy ion beams at the new project High Intensity heavy-ion AcceleratorFacility (HIAF) are presented. The ion beam parameters and the simulated accessible state of matter at HIAF are introduced, respectively. Theprogresses of the developed diagnostics for warm dense matter research including high energy electron radiography, multiple-channel pyrometer,in-situ energy loss and charge state of ion detector are briefly introduced.
基金support from The National Key R&D Program of China(Grant No.2019YFA0405400)China National Funds for Distinguished Young Scientists(No.11825505)Guangdong Innovative and Entrepreneurial Research Team Program(Grant No.2016ZT06G373).
文摘Purpose To protect accelerator devices from being damaged by high-power beam,a new beam dump system is under design for HIAF-BRing.Method Based on the optical characteristics,unwanted particles are safely deflected to a specific internal absorber through a local bump orbit generated by active-discharging magnets,which is achieved by paralleling a bleeder resistor of 600 m�to two of dipole magnet power supplies.Results Taking alignment and multipolefield errors into account,discarded beam can be dumped within 5 ms with an efficiency of more than 99.8%at any operation stage.Conclusion The proposed beam dump solution satisfies the machine protection requirements for BRing and can provide a new idea for similar facilities.
基金Supported by New Interdisciplinary and Advanced Pilot Fund of Chinese Academy of Sciences
文摘A new accelerator complex, HIAF （the High Intensity Heavy Ion Accelerator Facility）, has been approved in China. It is designed to provide intense primary and radioactive ion beams for research in high energy density physics, nuclear physics, atomic physics as well as other applications. In order to achieve a high intensity of up to 5× 10^11 ppp 23Su34＋, the Compression Ring （CRing） needs to stack more than 5 bunches transferred from the Booster Ring （BRing）. However, the normal bucket to bucket injection scheme can only achieve an intensity gain of 2, so an injection method, fixed barrier bucket （BB） supported by electron cooling, is proposed. To suppress the severe space charge effect during the stacking process, off-alignment is adopted in the cooler to control the transverse enfittance. In this paper, simulation and optimization with the BETACOOL program are presented.
基金Thanks for the support from the National Key R&D Program of China(Grant NO.2019YFA0405400)National Natural Science Foundation of China(Grant No.11905268)the support from Guangdong Innovative and Entrepreneurial Research Team Program(Grant No.2016ZT06G373).
文摘Purpose The machine protection system(MPS)is an essential part of the BRing(Booster Ring)at the HIAF(High Intensity heavy ion Accelerator Facility)to protect the accelerator from possible accidents.The high accumulation intensity and the complex operation mode of the BRing require MPS to respond quickly and operate stably.So,the detailed physical scheme of beam dump is proposed,and the corresponding simulation results are discussed in this paper.Method For this purpose,a multi-phased beam dump scheme based on the bipolar operation of fast extraction kicker magnets is proposed.The basic physical dimensions of the stoppers and energy deposited analysis have been calculated.Results and conclusion The multi-phased beam dump scheme is able to meet the engineering requirements,and the stopping efficiency can reach 100%for bunched beam.
文摘High Intensity heavy-ion Accelerator Facility(HIAF)is designed by the Institute of Modern Physics,Chinese Academy of Sciences,which can accelerate particles form proton up to uranium.As shown in Fig.1,HIAF is composed of the following parts:Superconducting Electron Cyclotron Resonance(SECR)ion source.
文摘Control network is one of the most important supportingl condition in HIAF (High Intensity Heavy-ion Accelerator Facility) control system. Only in aids of the control network, operators can remotely control or monitor all kinds of devices in the accelerator while sitting in the central control room to achieve real-time control.
文摘For the purpose of better performance,running stability and efficiency of CiADS and HIAF Superconducting Proton linac system,2K superfluid helium will be adopted for superconducting cavity cooling due to its specific properties,such as high thermal conductivity,low viscosity.
文摘In the framework of the HIAF fragment separator,about 50 superconducting magnets using Canted-Cosine-Theta coil configuration will be installed.As a proof of concept,0.8 m long multipole prototype magnet has been designed and fabricated to demonstrate its feasibility.A summary of the main parameters is given in Table 1.
基金National Natural Science Foundation of China(11435015,11505251)International S&T Cooperation Program of China(2016YFE0104900)。
文摘In the year 2018,our group mainly focused on two fields of studies.The first important work is High Energy Electron Radiography(HEER)research.Especially we focused on the Lanzhou HEER experimental platform setup.Another one is the investigation on the high average current electron injector for Phase II of HIAF project and some pre-research schemes are planned.
基金National Natural Science foundation of China(11575264,11375245,11475235)Hundred Talents Project of CAS。
文摘The 100 kV electron cooler device is designed for the new project HIAF to improve beam quality in SRing[1,2].The design work of the electron gun and the collector for the cooler has been finished and the prototype has being manufactured in the workshop.The structures of the gun and collector are shown in Fig.1.
