Accelerating Trajectory Simulation With COMA for CYCIAE-100

With multi-particle tracking code COMA, the process of accelerating for CYCIAE-100 is simulated and the beam dynamics such as the energy spread, phase slip, emittance, envelope etc. of the beam with the acceleration are studied in detail.     

HIRFL-CSR束流加速过程的模拟

考虑储存环内离子在纵向相空间的运动特性,模拟了ＨＩＲＦＬ－ＣＳＲ主环内重离子的加速过程。给出了粒子不同时刻在纵向相空间的分布,在给出主磁场的运行模式后,得到高频率频率、同步相位、高频电压、束流长度、动量散度以及粒子能量随时间的变化等主要参数。     

紧凑型回旋加速器中一种等时性磁场垫补算法

结合中国原子能科学研究院100 MeV回旋加速器中心区实验台架主磁铁镶条的垫补,发展了一种改进的多元线性回归磁场垫补算法.基于磁场测量系统实测的实验台架中心平面上的磁场分布以及有限元软件模拟数值计算的磁场,实现了这种改进的多元线性回归磁场垫补算法.该算法可适用于紧凑型回旋加速器中等时性磁场的垫补,以使所垫补的磁场满足回旋加速器束流动力学设计的要求.     

A Decade of Progress in Cyclotrons -- Frequency-Modulated and Isochronous

The advent of the isochronous cyclotron, capable of accelerating a wide selection of particles with energies variable up to limits previously inaccessible, has spurred the development of techniques leading to increased knowledge of orbit behavior and hence to external beams of greatly bettered quality. Among these activities are improved methods of magnet design, of field control and of beam diagnostics, novel means of launching the projectiles and more effective extraction schemes. Increased versatility has engendered new obstacles; e.g., space charge and charge exchange problems in the use of heavy ions. Advances in synchrocyclotrons, though still largely in the planning stage, reflect the present state of the art of spiral orbit machines. Increased current is the major goal. A variety of schemes for better axial focusing and higher repetition rate are under consideration. Beam stretching and improved focusing by grids or by einzel-type lenses have already been achieved.     

Non-Intercepting Ion Phase Measuring Equipment of the Isochronous Cyclotrons at Karlsruhe and Julich

A non-intercepting ion phase measuring equipment is in use at the Karlsruhe cyclotron. Five phase signals, steadily and simultaneously displayed are presenting a good survey of phase width and phase distribution versus radius. High noise immunity is obtained by the use of differential electrostatic pickup probes. Concerning the Jülich cyclotron a similar device with twelve double electrostatic probes is in construction.     

Beam Properties of Philips' A.V.F. Cyclotrons

Some Parameters determining the beamquality and energy resolution, will be discussed. Experiments have been performed, and results will be shown.     

聚变堆用难变形CLAM钢三通成形模拟及试验研究

利用有限元软件对聚变堆用CLAM钢三通管件的内高压整体成形工艺进行了数值模拟,研究了压力加载路径及摩擦条件关键工艺参数对支管高度以及壁厚分布的影响,从而确定了CLAM钢三通管件内高压成形的优化工艺参数组合。使用满足优化摩擦系数的表面涂层对CLAM钢管坯进行润滑处理,并根据优化结果对CLAM钢管材进行了内高压成形试验。实际成形的三通管件在几何尺寸及厚度分布方面,实验结果和模拟结果吻合。研究结果表明,通过有限元数值模拟可准确预测难变形材料CLAM钢三通的复杂冷成形,并确定工艺参数;通过确定的工艺参数可制备出几何尺寸及厚度分布均满足要求的高质量聚变堆用三通管件。     

Fusion Simulation Project: Integrated Simulation and Optimization of Magnetic Fusion Systems

This is the final report of a panel established as a subcommittee of the U. S. Department of Energy (DOE) Fusion Energy Sciences Committee (FESAC) on Integrated Simulation and Optimization of Magnetic Fusion Systems (ISOFS). The report was requested by the DOE in February 2002 and the approved report was transmitted to the DOE by the FESAC in December 2002. The report addresses the challenge of how to develop fully integrated capability for predicting the performance of externally-controlled systems including turbulent transport, macroscopic stability, wave-particle physics, and multi-phase interfaces.     

压缩感知理论在超宽带系统的应用前景分析

超宽带( Ultra - Wideband,UWB)在无线通信、雷达探测与成像、无线传感网络等领域具有广阔的应用前景.由于UWB脉冲信号的频带宽、时间宽度窄,高速采样已成为制约UWB无线系统快速发展的一个重要的技术瓶颈.压缩感知(Compressive Sensing or Compressed Sensing,CS)...     

Software Verification for Techno-Economic Simulation of Nuclear Energy Systems: Results and Recommendations

Atomic Energy - The results of a computational analysis of tests performed in verification of software tools for technical and economic modeling of nuclear power systems are presented. Each of four...     

Research of Brazing Technics for Disk-loaded Accelerating Tube

正As the penetration depth of electron accelerated by 10 MeV electron irradiating accelerator is deep,the accelerator has broad application prospects.The performance of the accelerator is influenced,to a great extent,by the travelling wave accelerating tube,which is the core component of the accelerator.To meet the requirements     

The Simulation of Space Radiation Damage to Spacecraft Systems

Space radiation has induced damage to spacecraft in near earth orbits in a number of documented cases. Explorer XIV, Explorer XV, UK-1, TRAAC, TRANSIT IV B and TELSTAR I were among these. It has become imperative that an adequate laboratory simulation technique be found and applied to future spacecraft to extend the useful lifetime of spacecraft and prevent premature failures. The choice of the equipment for carrying out laboratory simulations at Goddard Space Flight Center has been made by an analysis of damage produced in semiconductor devices. The relative damage produced in semiconductors with various particle energies was compared with the number of those particles at each energy in space to produce a curve showing the particle energies which are most damaging in space. From the curves it becomes clear that energies from about 1 to 4 Mev are the most damaging for electrons and protons. Therefore, the Goddard Space Flight Center will have a facility with a 0.5-3 Mev electron accelerator, a 0.5-4 Mev proton accelerator and a 0.1-1 Mev proton-electron accelerator, to cover the low energy range. The facility will also have a 30,000 curie Cobalt 60 area able to irradiate whole spacecraft to simulate ionization damage effects. With these facilities a reasonable program of radiation hardening of long-lived spacecraft may be carried out.     

PIC Code for Beam Dynamics Simulation and Its Applications on Injection Line of CYCIAE-100

The space-charge effects can impose significant influence on the high intensity beam transport process. Along with the development of computing physics and computer science, PIC （Particle-In-Cell） methods are playing an important role in the accurately numerical simulation of charged particle beam＇s behavior in accelerator and beam transport line.     

Study on the focusing properties of the Accelerating Tube

1.IntroductionAnacceleratingtubemadeup0fcylinderelectrodesisanelectrostaticlenssystem,inwhichtheionpathissimilartothatinopticlens.Manypapershavebeent0uchedonit,butveryseldomin-volvedwithanin-depthdiscussi0ni0nonfocusingpropertiesofanacceleratingtube[l~4].ThispapergivesasimpledtherentiaImethod,bywhichtheionpathisintegratedwithaunitelectr0staticlens,anddiscussesthefocusingpropertiesofthetube.2.BasicequationsofaunitlensTwocyllnderelectrodesmakeupaunitelectro-staticlens.Fortheweaklensapproximati…