快循环同步加速器的二极磁铁和四极磁铁磁场变化过快可能会在常规真空管道中引发严重的涡流效应,针对这一问题国内外提出了多种新型真空管道方案,例如陶瓷管道、外侧加筋超薄壁不锈钢管道以及陶瓷内衬超薄壁不锈钢管道等等。最近中国科...快循环同步加速器的二极磁铁和四极磁铁磁场变化过快可能会在常规真空管道中引发严重的涡流效应,针对这一问题国内外提出了多种新型真空管道方案,例如陶瓷管道、外侧加筋超薄壁不锈钢管道以及陶瓷内衬超薄壁不锈钢管道等等。最近中国科学院近代物理研究所(IMP)的HIAF工程团队提出了用钛合金内衬代替陶瓷内衬的方案,形成的钛合金内衬超薄壁不锈钢真空管道横向孔径更小,出气率更低,制造成本也更少。但钛合金内衬真空管道将成为HIAF装置的环形主加速器BRing上重要的束流耦合阻抗源。其中四极铁钛合金内衬真空管道引入的阻抗及其影响,以及相应阻抗减小设计的有效性尚待评估。本工作首先在模拟软件CST studio suite中使用两种不同的方法分别对各种规格的四极铁钛合金内衬真空管道的阻抗进行了模拟,两种方法给出了互相接近的结果。然后在此基础上计算了换用钛合金内衬真空管道后BRing的全环横向阻抗。进一步地,本工作结合全环阻抗数据利用Vlasov solver计算了换用钛合金内衬真空管道后BRing上^(78)Kr^(19+)束在不同流强下的模式频率移动。发现二极磁铁和四极磁铁钛合金内衬真空管道采用阻抗减小设计前,BRing上^(78)Kr^(19+)束发生横向模耦合不稳定性的流强阈值为2.7×10^(11)ppp,低于BRing上^(78)Kr^(19+)束的设计流强(3×10^(11)ppp)。采用阻抗减小设计后,^(78)Kr^(19+)束发生横向模耦合不稳定性的流强阈值会提升到4.4×10^(11)ppp。这表明二极铁和四极铁钛合金内衬真空管道的阻抗减小设计是有效的。仅从横向宽带束流耦合阻抗的角度来看,BRing二极磁铁和四极磁铁上用钛合金内衬真空管道替代陶瓷内衬真空管道是可行的。展开更多
The heavy-ion accelerator facility(HIAF)under construction in China will produce various stable and intense radioactive beams with energies ranging from MeV/u to GeV/u.The ion-linac(iLinac)accelerator,which will serve...The heavy-ion accelerator facility(HIAF)under construction in China will produce various stable and intense radioactive beams with energies ranging from MeV/u to GeV/u.The ion-linac(iLinac)accelerator,which will serve as the injector for the HIAF,is a superconducting heavy-ion accelerator containing 13 cryomodules.It will operate in either continuous wave mode or pulsed mode,with a beam current ranging from 0.01 to 1 emA.The beam position monitor(BPM)is crucial for this high-beam-power machine,which requires precise beam control and a very small beam loss of less than 1 W/m,especially inside the cryomodules of this unique beam instrument.Nearly 70 BPMs will be installed on the iLinac.New digital beam position and phase measurement(DBPPM)electronics based on a heterogeneous multiprocessing platform system-on-chip(MPSoC)has been developed to provide accurate beam trajectory and phase measurements as well as beam interlocking signals for a fast machine protection system(MPS).The DBPPM comprises an analog front-end(AFE)board in field programmable gate array(FPGA)mezzanine-connector(FMC)form factor,along with a digital signal processing board housed within a “2U 19”chassis.To mitigate radio frequency(RF)leakage effects from high-power RF systems in certain scenarios,beam signals undergo simultaneous processing at both fundamental and second-harmonic frequencies.A dynamic range from-65 dBm to 0 dBm was established to accommodate both weak beam commissioning and high-intensity operational demands.Laboratory tests demonstrated that at input power levels exceeding-45 d Bm,the phase resolution surpasses 0.05°,and the position resolution exceeds 5μm.These results align well with the stipulated measurement requirements.Moreover,the newly developed DBPPM has self-testing and self-calibration functions that are highly helpful for the systematic evaluation of numerous electronic components and fault diagnosis equipment.In addition,the DBPPM electronics implements a 2D nonlinear polynomial correction on the FPGA and can collect accurate real-time position measurements at large beam offsets.This newly developed DBPPM electronics has been applied to several Linac machines,and the results from beam measurements show high performance,good long-term stability,and high reliability.In this paper,a detailed overview of the architecture,performance,and proof-of-principle measurement of the beams is presented.展开更多
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 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
A large scale scienti c research platform, named the High Intensity heavy-ion Accelerator Facility (HIAF), was proposed in light of the trend and development in nuclear physics and the associated high energy heavy ion...A large scale scienti c research platform, named the High Intensity heavy-ion Accelerator Facility (HIAF), was proposed in light of the trend and development in nuclear physics and the associated high energy heavy ion research elds. HIAF is one of the 16 approved national projects for basic sciences and technologies as the 12th ve-year-plan in China; it will be a laboratory open to the outside world, similar to CSR which was built as the 9th ve-year-plan in China[1].展开更多
The cryogenic system provides superfluid helium cooling power for the superconducting linac,which is a necessary condition for its operation.In 2022,significant progress has been made with the cryogenic system.
Kicker power supply is one of the key components of the high-intensity heavy ion accelerator HIAF.It is also one of the main components to achieve fast extraction of the beam from BRing and fast injection of the beam ...Kicker power supply is one of the key components of the high-intensity heavy ion accelerator HIAF.It is also one of the main components to achieve fast extraction of the beam from BRing and fast injection of the beam to SRing.Table 1 shows the technical indicators of the BRing Kicker power supply and SRing Kicker power supply.It adopts the scheme of Blumlein-PFN and thyratron solution.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
The HIAF control network undertakes the operation of the whole HIAF facility and the big data transmission of each experimental terminal.It is an indispensable part for the HIAF construction and operation period.This ...The HIAF control network undertakes the operation of the whole HIAF facility and the big data transmission of each experimental terminal.It is an indispensable part for the HIAF construction and operation period.This system should have the characteristics of stable,advanced,flexible and highly available while meet the requirements of HIAF operation and data transmission,user service and efficient operation and maintenance.展开更多
Design and development of the beam instruments for the HIAF project.By the end of 2022,we have completed the design and beam tests of almost all types of beam instruments for HIAF,and most of the beam diagnostics indu...Design and development of the beam instruments for the HIAF project.By the end of 2022,we have completed the design and beam tests of almost all types of beam instruments for HIAF,and most of the beam diagnostics induments for HIAF iLinac,booster ring(BRing)and HFRS are entering the batch fabrication stage.Most of the key detector models have already been tested with beam at IMP,for example the wall current monitor,the diagonal-cut type beam position monitor for BRing,the strip-line type beam position monitor for HFRS,the beam loss monitor and so on,which are proved to meet our project requirements.展开更多
Last year,obvious progresses have been made with electrical engineering and electromagnetic compatibility system for HIAF.Detailed equipment layout and three-dimensional design of bridge cables are devised for all dis...Last year,obvious progresses have been made with electrical engineering and electromagnetic compatibility system for HIAF.Detailed equipment layout and three-dimensional design of bridge cables are devised for all distribution room.Power distribution scheme for dipole magnet power supply of BRing is optimized according to its characteristics.The dual-low-voltage transformer of 1250 kVA is applied to this power supply independently,and the process of its design and order are completed.(Figs.1 and 2).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
Some significant progress has been made for HIAF vacuum system in 2022,such as the development of the ultra-thin wall XHV chamber with titanium alloy lining(a key technology of HIAF),the construction of BRing demonstr...Some significant progress has been made for HIAF vacuum system in 2022,such as the development of the ultra-thin wall XHV chamber with titanium alloy lining(a key technology of HIAF),the construction of BRing demonstration section in Tianshui,the procurement of most vacuum acquisition equipment,and so on.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
A Quarter Wave Resonator(QWR)has been designed for the HIAF(High Intensity heavy ion Accelerator Facility)project.Working at 81.25 MHz,the QWR accelerates heavy ion beams from 0.8 to 5.3 MeV in the high Intensity heav...A Quarter Wave Resonator(QWR)has been designed for the HIAF(High Intensity heavy ion Accelerator Facility)project.Working at 81.25 MHz,the QWR accelerates heavy ion beams from 0.8 to 5.3 MeV in the high Intensity heavy ion superconducting LINAC section of HIAF.展开更多
1.National Investment Component of HIAF HIAF civil construction covers about 33025.51 m^(2) in total that are jointly supported by the National investment and local government.The actual construction scale of national...1.National Investment Component of HIAF HIAF civil construction covers about 33025.51 m^(2) in total that are jointly supported by the National investment and local government.The actual construction scale of national investment in High Intensity Heavy-ion Accelerator Facility(HIAF)civil engineering is about 33025.51 m^(2).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
文摘快循环同步加速器的二极磁铁和四极磁铁磁场变化过快可能会在常规真空管道中引发严重的涡流效应,针对这一问题国内外提出了多种新型真空管道方案,例如陶瓷管道、外侧加筋超薄壁不锈钢管道以及陶瓷内衬超薄壁不锈钢管道等等。最近中国科学院近代物理研究所(IMP)的HIAF工程团队提出了用钛合金内衬代替陶瓷内衬的方案,形成的钛合金内衬超薄壁不锈钢真空管道横向孔径更小,出气率更低,制造成本也更少。但钛合金内衬真空管道将成为HIAF装置的环形主加速器BRing上重要的束流耦合阻抗源。其中四极铁钛合金内衬真空管道引入的阻抗及其影响,以及相应阻抗减小设计的有效性尚待评估。本工作首先在模拟软件CST studio suite中使用两种不同的方法分别对各种规格的四极铁钛合金内衬真空管道的阻抗进行了模拟,两种方法给出了互相接近的结果。然后在此基础上计算了换用钛合金内衬真空管道后BRing的全环横向阻抗。进一步地,本工作结合全环阻抗数据利用Vlasov solver计算了换用钛合金内衬真空管道后BRing上^(78)Kr^(19+)束在不同流强下的模式频率移动。发现二极磁铁和四极磁铁钛合金内衬真空管道采用阻抗减小设计前,BRing上^(78)Kr^(19+)束发生横向模耦合不稳定性的流强阈值为2.7×10^(11)ppp,低于BRing上^(78)Kr^(19+)束的设计流强(3×10^(11)ppp)。采用阻抗减小设计后,^(78)Kr^(19+)束发生横向模耦合不稳定性的流强阈值会提升到4.4×10^(11)ppp。这表明二极铁和四极铁钛合金内衬真空管道的阻抗减小设计是有效的。仅从横向宽带束流耦合阻抗的角度来看,BRing二极磁铁和四极磁铁上用钛合金内衬真空管道替代陶瓷内衬真空管道是可行的。
基金supported by the National Natural Science Foundation of China(No.11975290)。
文摘The heavy-ion accelerator facility(HIAF)under construction in China will produce various stable and intense radioactive beams with energies ranging from MeV/u to GeV/u.The ion-linac(iLinac)accelerator,which will serve as the injector for the HIAF,is a superconducting heavy-ion accelerator containing 13 cryomodules.It will operate in either continuous wave mode or pulsed mode,with a beam current ranging from 0.01 to 1 emA.The beam position monitor(BPM)is crucial for this high-beam-power machine,which requires precise beam control and a very small beam loss of less than 1 W/m,especially inside the cryomodules of this unique beam instrument.Nearly 70 BPMs will be installed on the iLinac.New digital beam position and phase measurement(DBPPM)electronics based on a heterogeneous multiprocessing platform system-on-chip(MPSoC)has been developed to provide accurate beam trajectory and phase measurements as well as beam interlocking signals for a fast machine protection system(MPS).The DBPPM comprises an analog front-end(AFE)board in field programmable gate array(FPGA)mezzanine-connector(FMC)form factor,along with a digital signal processing board housed within a “2U 19”chassis.To mitigate radio frequency(RF)leakage effects from high-power RF systems in certain scenarios,beam signals undergo simultaneous processing at both fundamental and second-harmonic frequencies.A dynamic range from-65 dBm to 0 dBm was established to accommodate both weak beam commissioning and high-intensity operational demands.Laboratory tests demonstrated that at input power levels exceeding-45 d Bm,the phase resolution surpasses 0.05°,and the position resolution exceeds 5μm.These results align well with the stipulated measurement requirements.Moreover,the newly developed DBPPM has self-testing and self-calibration functions that are highly helpful for the systematic evaluation of numerous electronic components and fault diagnosis equipment.In addition,the DBPPM electronics implements a 2D nonlinear polynomial correction on the FPGA and can collect accurate real-time position measurements at large beam offsets.This newly developed DBPPM electronics has been applied to several Linac machines,and the results from beam measurements show high performance,good long-term stability,and high reliability.In this paper,a detailed overview of the architecture,performance,and proof-of-principle measurement of the beams is presented.
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.
文摘A large scale scienti c research platform, named the High Intensity heavy-ion Accelerator Facility (HIAF), was proposed in light of the trend and development in nuclear physics and the associated high energy heavy ion research elds. HIAF is one of the 16 approved national projects for basic sciences and technologies as the 12th ve-year-plan in China; it will be a laboratory open to the outside world, similar to CSR which was built as the 9th ve-year-plan in China[1].
文摘The cryogenic system provides superfluid helium cooling power for the superconducting linac,which is a necessary condition for its operation.In 2022,significant progress has been made with the cryogenic system.
文摘Kicker power supply is one of the key components of the high-intensity heavy ion accelerator HIAF.It is also one of the main components to achieve fast extraction of the beam from BRing and fast injection of the beam to SRing.Table 1 shows the technical indicators of the BRing Kicker power supply and SRing Kicker power supply.It adopts the scheme of Blumlein-PFN and thyratron solution.
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.
文摘The HIAF control network undertakes the operation of the whole HIAF facility and the big data transmission of each experimental terminal.It is an indispensable part for the HIAF construction and operation period.This system should have the characteristics of stable,advanced,flexible and highly available while meet the requirements of HIAF operation and data transmission,user service and efficient operation and maintenance.
文摘Design and development of the beam instruments for the HIAF project.By the end of 2022,we have completed the design and beam tests of almost all types of beam instruments for HIAF,and most of the beam diagnostics induments for HIAF iLinac,booster ring(BRing)and HFRS are entering the batch fabrication stage.Most of the key detector models have already been tested with beam at IMP,for example the wall current monitor,the diagonal-cut type beam position monitor for BRing,the strip-line type beam position monitor for HFRS,the beam loss monitor and so on,which are proved to meet our project requirements.
文摘Last year,obvious progresses have been made with electrical engineering and electromagnetic compatibility system for HIAF.Detailed equipment layout and three-dimensional design of bridge cables are devised for all distribution room.Power distribution scheme for dipole magnet power supply of BRing is optimized according to its characteristics.The dual-low-voltage transformer of 1250 kVA is applied to this power supply independently,and the process of its design and order are completed.(Figs.1 and 2).
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Some significant progress has been made for HIAF vacuum system in 2022,such as the development of the ultra-thin wall XHV chamber with titanium alloy lining(a key technology of HIAF),the construction of BRing demonstration section in Tianshui,the procurement of most vacuum acquisition equipment,and so on.
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A Quarter Wave Resonator(QWR)has been designed for the HIAF(High Intensity heavy ion Accelerator Facility)project.Working at 81.25 MHz,the QWR accelerates heavy ion beams from 0.8 to 5.3 MeV in the high Intensity heavy ion superconducting LINAC section of HIAF.
文摘1.National Investment Component of HIAF HIAF civil construction covers about 33025.51 m^(2) in total that are jointly supported by the National investment and local government.The actual construction scale of national investment in High Intensity Heavy-ion Accelerator Facility(HIAF)civil engineering is about 33025.51 m^(2).
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.
