In recent years,heavy ion accelerator technology has been rapidly developing worldwide and widely applied in the fields of space radiation simulation and particle therapy.Usually,a very high uniformity in the irradiat...In recent years,heavy ion accelerator technology has been rapidly developing worldwide and widely applied in the fields of space radiation simulation and particle therapy.Usually,a very high uniformity in the irradiation area is required for the extracted ion beams,which is crucial because it directly affects the experimental precision and therapeutic effect.Specifically,ultra-large-area and high-uniformity scanning are crucial requirements for spacecraft radiation effects assessment and serve as core specification for beamline terminal design.In the 300 MeV proton and heavy ion accelerator complex at the Space Environment Simulation and Research Infrastructure(SESRI),proton and heavy ion beams will be accelerated and ultimately delivered to three irradiation terminals.In order to achieve the required large irradiation area of 320 mm×320 mm,horizontal and vertical scanning magnets are used in the extraction beam line.However,considering the various requirements for beam species and energies,the tracking accuracy of power supplies(PSs),the eddy current effect of scanning magnets,and the fluctuation of ion bunch structure will reduce the irradiation uniformity.To mitigate these effects,a beam uniformity optimization method based on the measured beam distribution was proposed and applied in the accelerator complex at SESRI.In the experiment,the uniformity is successfully optimized from 75%to over 90%after five iterations of adjustment to the PS waveforms.In this paper,the method and experimental results were introduced.展开更多
Four types of magnetic alloy cores,labeled as V1,V2,A1 and A2,were produced by Liyuan Corp.Ltd.,for the radio frequency compression cavity of HIRFL-CSRm.In this work,their permeability,quality factor (Q value) and shu...Four types of magnetic alloy cores,labeled as V1,V2,A1 and A2,were produced by Liyuan Corp.Ltd.,for the radio frequency compression cavity of HIRFL-CSRm.In this work,their permeability,quality factor (Q value) and shunt impedance were measured before installing them into the cavity.The results show that the V1,V2 and A2 have higher permeability and shunt impedance,and lower Q value,and are suitable to the radio frequency compression cavity.展开更多
The injection and extraction system of Charge Stripping Injection(CSI) and 1 Charge Stripping Injection of HIRFL-CSR progressed steadily in slow extraction of CSRm, design and 2001. The progress covers design developm...The injection and extraction system of Charge Stripping Injection(CSI) and 1 Charge Stripping Injection of HIRFL-CSR progressed steadily in slow extraction of CSRm, design and 2001. The progress covers design development of components.For beam accumulation schemes of CSRm, besides of Multiple Multi-turn Injection(MMI) and RF Stacking(RFS), Charge Stripping Injection(CSI) is designed for accumulation of light ions(C～Ne). It’s well展开更多
Nuclear mass measurements provide valuable information on the nuclear binding energy which reflects the summed result of all interactions among its constituent protons and neutrons. The systematic and accurate knowled...Nuclear mass measurements provide valuable information on the nuclear binding energy which reflects the summed result of all interactions among its constituent protons and neutrons. The systematic and accurate knowledge of nuclear masses have wide application in many areas of subatomic physics ranging from nuclear structure and astrophysics to the fundamental interactions and symmetries depending on the achieved mass precision[1].展开更多
As a powerful heavy ion injector for HIRFL, the SSC-Linac is under constructing at IMP. In 2015, the manu-facture of the rst IH-DTL cavity has been nished. Low power measurement and high power conditioning were perfor...As a powerful heavy ion injector for HIRFL, the SSC-Linac is under constructing at IMP. In 2015, the manu-facture of the rst IH-DTL cavity has been nished. Low power measurement and high power conditioning were performed in sequencely. The recent R&D progress of the SSC-Linac and the development of IH-DTL accelerator are presented.展开更多
The total recombination rate coefficients of lithium-like 36Ar15+ ions have been measured by employing the electron-ion merged-beams technique at the heavy ion storage ring CSRm at IMP[1]. Fig. 1 (a) shows the DR spec...The total recombination rate coefficients of lithium-like 36Ar15+ ions have been measured by employing the electron-ion merged-beams technique at the heavy ion storage ring CSRm at IMP[1]. Fig. 1 (a) shows the DR spectrum for electron energy from 0 to 35 eV in the center-of-mass (c.m.) frame involving all the DR resonances associated with 2s1=2!2p1=2 and 2s1=2!2p3=2 excitations.展开更多
Laser cooling is the most promising method to achieve high phase-space densities, even crystalline beams for relativistic heavy ion at storage rings[1]. A test laser cooling experiment has been performed with 12C3+ io...Laser cooling is the most promising method to achieve high phase-space densities, even crystalline beams for relativistic heavy ion at storage rings[1]. A test laser cooling experiment has been performed with 12C3+ ions at the CSRe. In this experiment, the 12C3+ ions were produced from an electron cyclotron resonance (ECR) ion source, and due to the residual gas and the injection gases such as CO and CO2, 16O4+ ions will be produced at the same time.展开更多
Isochronous mass spectrometry (IMS) in storage rings is a powerful tool for mass measurements of exotic nucle with very short half-lives down to several tens of microseconds, using a multicomponent secondary beam sepa...Isochronous mass spectrometry (IMS) in storage rings is a powerful tool for mass measurements of exotic nucle with very short half-lives down to several tens of microseconds, using a multicomponent secondary beam separated in-ight without cooling. However, the inevitable momentum spread of secondary ions limits the precision of nuclear masses determined by using IMS.展开更多
基金Supported by National Key R&D Program of China(2019YFA0405400)。
文摘In recent years,heavy ion accelerator technology has been rapidly developing worldwide and widely applied in the fields of space radiation simulation and particle therapy.Usually,a very high uniformity in the irradiation area is required for the extracted ion beams,which is crucial because it directly affects the experimental precision and therapeutic effect.Specifically,ultra-large-area and high-uniformity scanning are crucial requirements for spacecraft radiation effects assessment and serve as core specification for beamline terminal design.In the 300 MeV proton and heavy ion accelerator complex at the Space Environment Simulation and Research Infrastructure(SESRI),proton and heavy ion beams will be accelerated and ultimately delivered to three irradiation terminals.In order to achieve the required large irradiation area of 320 mm×320 mm,horizontal and vertical scanning magnets are used in the extraction beam line.However,considering the various requirements for beam species and energies,the tracking accuracy of power supplies(PSs),the eddy current effect of scanning magnets,and the fluctuation of ion bunch structure will reduce the irradiation uniformity.To mitigate these effects,a beam uniformity optimization method based on the measured beam distribution was proposed and applied in the accelerator complex at SESRI.In the experiment,the uniformity is successfully optimized from 75%to over 90%after five iterations of adjustment to the PS waveforms.In this paper,the method and experimental results were introduced.
基金Supported by Innovation Research Community of National Natural Science Foundation of China(10921504)
文摘Four types of magnetic alloy cores,labeled as V1,V2,A1 and A2,were produced by Liyuan Corp.Ltd.,for the radio frequency compression cavity of HIRFL-CSRm.In this work,their permeability,quality factor (Q value) and shunt impedance were measured before installing them into the cavity.The results show that the V1,V2 and A2 have higher permeability and shunt impedance,and lower Q value,and are suitable to the radio frequency compression cavity.
文摘The injection and extraction system of Charge Stripping Injection(CSI) and 1 Charge Stripping Injection of HIRFL-CSR progressed steadily in slow extraction of CSRm, design and 2001. The progress covers design development of components.For beam accumulation schemes of CSRm, besides of Multiple Multi-turn Injection(MMI) and RF Stacking(RFS), Charge Stripping Injection(CSI) is designed for accumulation of light ions(C～Ne). It’s well
文摘Nuclear mass measurements provide valuable information on the nuclear binding energy which reflects the summed result of all interactions among its constituent protons and neutrons. The systematic and accurate knowledge of nuclear masses have wide application in many areas of subatomic physics ranging from nuclear structure and astrophysics to the fundamental interactions and symmetries depending on the achieved mass precision[1].
文摘As a powerful heavy ion injector for HIRFL, the SSC-Linac is under constructing at IMP. In 2015, the manu-facture of the rst IH-DTL cavity has been nished. Low power measurement and high power conditioning were performed in sequencely. The recent R&D progress of the SSC-Linac and the development of IH-DTL accelerator are presented.
基金National Natural Science Foundation of China(11320101003), External Cooperation Program of Chinese Academy of Sciences(GJHZ1305)
文摘The total recombination rate coefficients of lithium-like 36Ar15+ ions have been measured by employing the electron-ion merged-beams technique at the heavy ion storage ring CSRm at IMP[1]. Fig. 1 (a) shows the DR spectrum for electron energy from 0 to 35 eV in the center-of-mass (c.m.) frame involving all the DR resonances associated with 2s1=2!2p1=2 and 2s1=2!2p3=2 excitations.
基金National Natural Science Foundation of China(11504388), West Light Doctoral Foundation of Chinese Academy of Sciences
文摘Laser cooling is the most promising method to achieve high phase-space densities, even crystalline beams for relativistic heavy ion at storage rings[1]. A test laser cooling experiment has been performed with 12C3+ ions at the CSRe. In this experiment, the 12C3+ ions were produced from an electron cyclotron resonance (ECR) ion source, and due to the residual gas and the injection gases such as CO and CO2, 16O4+ ions will be produced at the same time.
文摘Isochronous mass spectrometry (IMS) in storage rings is a powerful tool for mass measurements of exotic nucle with very short half-lives down to several tens of microseconds, using a multicomponent secondary beam separated in-ight without cooling. However, the inevitable momentum spread of secondary ions limits the precision of nuclear masses determined by using IMS.
