本文介绍了二维PIC(Particle in cell)方法,这种方法常用于粒子动力学模拟中空间电荷作用的计算。并比较了以时间为自变量(t-code)和以纵向位置为自变量(z-code)的两种动力学模拟程序;针对“国家重点基础研究发展规划”洁净核能项目中...本文介绍了二维PIC(Particle in cell)方法,这种方法常用于粒子动力学模拟中空间电荷作用的计算。并比较了以时间为自变量(t-code)和以纵向位置为自变量(z-code)的两种动力学模拟程序;针对“国家重点基础研究发展规划”洁净核能项目中的射频四极(RFQ)加速器结构参数,给出了单束加速和正、负离子束同时加速两种情况下,t-code和z-code模拟得出的传输效率。结果表明,当束团的相位宽度大或能散大时,z-code 在计算空间电荷作用时会引入相对较大的误差,从而应该使用t-code来进行动力学模拟,以获得更准确的结果。展开更多
The physics design of a 3 MeV, 30 mA, 352.2 MHz Radio Frequency Quadrupole (RFQ) is done for the future Indian Spallation Neutron Source (ISNS) project at RRCAT, India. The beam dynamics design of RFQ and the error an...The physics design of a 3 MeV, 30 mA, 352.2 MHz Radio Frequency Quadrupole (RFQ) is done for the future Indian Spallation Neutron Source (ISNS) project at RRCAT, India. The beam dynamics design of RFQ and the error analysis of the input beam parameters are done by using standard beam dynamics code PARMTEQM. The electromagnetic stu-dies for the two-dimensional and three-dimensional cavity design are performed using computer codes SUPERFISH and CST Microwave Studio. The physics design of RFQ consisting of the beam dynamics design near the beam axis and the electromagnetic design for the RFQ resonator is described here.展开更多
针对自制垂直引入式飞行时间质谱仪（orthogonal extraction time-of-flight mass spectrometer，O-TOFMS）的需要，运用直接数字频率合成（direct digital frequency synthesis，DDS）技术，研制了射频四极杆的高压射频驱动电路装置。...针对自制垂直引入式飞行时间质谱仪（orthogonal extraction time-of-flight mass spectrometer，O-TOFMS）的需要，运用直接数字频率合成（direct digital frequency synthesis，DDS）技术，研制了射频四极杆的高压射频驱动电路装置。该驱动器频率可调范围为0．5～2MHz，幅度最高达到1000Vp-p。该射频四极杆驱动器（radio frequency quadrupole driver，RFQ Driver）可用于分子离子反应器（molecule ion reactor，MIR）和RFQ驱动，其结构简洁、成本低、性能稳定可靠。展开更多
The ultra-high intensity heavy-ion beam is highly pursued for heavy-ion researches and applications.However,it is limited by heavy-ion production of ion source and space-charge-effect in the low energy region.The Heav...The ultra-high intensity heavy-ion beam is highly pursued for heavy-ion researches and applications.However,it is limited by heavy-ion production of ion source and space-charge-effect in the low energy region.The Heavy-ion Inertial Fusion(HIF)facilities were proposed in 1970s.The HIF injectors have large cavity number and long total length,e.g.,there are 27 injectors in HIDIF and HIBLIC is 30 km in length,and the corresponding HIF facilities are too large and too expensive to be constructed.Recently,ion acceleration technologies have been developing rapidly,especially in the low energy region,where the acceleration of high intensity heavy-ions is realized.Meanwhile,super-conducting(SC)acceleration matures and increases the acceleration gradient in medium and high energy regions.The length of HIF injectors can be shortened to a buildable length of 2.5 km.This paper will present a review of a renewed HIF injector,which adopts multi-beam linac-based cavities.展开更多
北京大学射频四极场(radio frequency quadruple,RFQ)加速器课题组在陈佳洱院士带领下,先后于1994、1999年提出并研制出我国第一台重离子整体分离环300 keV N^(+)和1 Me V O^(+) RFQ加速器;为提高离子的加速效率,提出分离作用RFQ加速器...北京大学射频四极场(radio frequency quadruple,RFQ)加速器课题组在陈佳洱院士带领下,先后于1994、1999年提出并研制出我国第一台重离子整体分离环300 keV N^(+)和1 Me V O^(+) RFQ加速器;为提高离子的加速效率,提出分离作用RFQ加速器结构,研制出结构样机并完成束流验证;提出用RFQ加速器同时加速同荷质比正负离子的新思想,并在两台已建成的RFQ加速器上完成束流验证,通过模拟再现了正负离子自动聚束和加速的过程,用同轴快靶成功观测到正负氧离子的微观束流波形;发展了RFQ均温束流传输的束流动力学设计思想,研制出国内首台基于RFQ的中子成像装置,该四杆型D^(+)RFQ加速器是国际上迄今为止运行频率最高的四杆型D+RFQ加速器;与中国科学院高能物理研究所、中国原子能科学研究院合作,研制了352 MHz质子RFQ工艺模型腔,有效地助推了中国首台质子加速器驱动次临界系统(accelerator driven sub-critical system,ADS)RFQ加速器的研制.北京大学与中国科学院近代物理研究所合作,设计、建造了高电荷态重离子^(238)U^(34+)连续波RFQ加速器,已成功加速元素周期表中诸多重离子束流,并已稳定运行8年之久;与中国科学院近代物理研究所合作研制出国际首台162.5 MHz开窗四翼型D+RFQ加速器,成功加速连续波H_(2)^(+)流强1.95 mA,传输效率90%;与核工业西南物理研究院合作,设计并调试了一台162.5 MHz D+四翼型RFQ加速器,成功加速1%H_(2)^(+)流强10 mA.展开更多
文摘本文介绍了二维PIC(Particle in cell)方法,这种方法常用于粒子动力学模拟中空间电荷作用的计算。并比较了以时间为自变量(t-code)和以纵向位置为自变量(z-code)的两种动力学模拟程序;针对“国家重点基础研究发展规划”洁净核能项目中的射频四极(RFQ)加速器结构参数,给出了单束加速和正、负离子束同时加速两种情况下,t-code和z-code模拟得出的传输效率。结果表明,当束团的相位宽度大或能散大时,z-code 在计算空间电荷作用时会引入相对较大的误差,从而应该使用t-code来进行动力学模拟,以获得更准确的结果。
文摘The physics design of a 3 MeV, 30 mA, 352.2 MHz Radio Frequency Quadrupole (RFQ) is done for the future Indian Spallation Neutron Source (ISNS) project at RRCAT, India. The beam dynamics design of RFQ and the error analysis of the input beam parameters are done by using standard beam dynamics code PARMTEQM. The electromagnetic stu-dies for the two-dimensional and three-dimensional cavity design are performed using computer codes SUPERFISH and CST Microwave Studio. The physics design of RFQ consisting of the beam dynamics design near the beam axis and the electromagnetic design for the RFQ resonator is described here.
文摘针对自制垂直引入式飞行时间质谱仪（orthogonal extraction time-of-flight mass spectrometer，O-TOFMS）的需要，运用直接数字频率合成（direct digital frequency synthesis，DDS）技术，研制了射频四极杆的高压射频驱动电路装置。该驱动器频率可调范围为0．5～2MHz，幅度最高达到1000Vp-p。该射频四极杆驱动器（radio frequency quadrupole driver，RFQ Driver）可用于分子离子反应器（molecule ion reactor，MIR）和RFQ驱动，其结构简洁、成本低、性能稳定可靠。
基金The work was supported by the NSFC through Grant Nos.11535016 and 11475232.
文摘The ultra-high intensity heavy-ion beam is highly pursued for heavy-ion researches and applications.However,it is limited by heavy-ion production of ion source and space-charge-effect in the low energy region.The Heavy-ion Inertial Fusion(HIF)facilities were proposed in 1970s.The HIF injectors have large cavity number and long total length,e.g.,there are 27 injectors in HIDIF and HIBLIC is 30 km in length,and the corresponding HIF facilities are too large and too expensive to be constructed.Recently,ion acceleration technologies have been developing rapidly,especially in the low energy region,where the acceleration of high intensity heavy-ions is realized.Meanwhile,super-conducting(SC)acceleration matures and increases the acceleration gradient in medium and high energy regions.The length of HIF injectors can be shortened to a buildable length of 2.5 km.This paper will present a review of a renewed HIF injector,which adopts multi-beam linac-based cavities.
