Magnet Design and Construction Preparation for CYCIAE-100

As the hill gap is required to increase by -1 cm due to the installation of RF, centering coils, beam diagnostics and etc., several adjusted geometries of the main magnet are investigated numerically and the new magnetic field distribution is provided for beam dynamics study in both acceleration and central region. Obviously, many key parameters of the magnet, e.g. the profile of hill gap, shimming bar, central plug, have to be re-designed while the excitation current is adjusted. In the year 2005, the basic geometry and its field distribution design were fixed, and many engineering aspects were in progress, including the mechanical structure design and construction preparation.     

Mapper Design for CYCIAE-100 Project

There is a big range of magnetic field in the compact cyclotron, and the error caused by magnetic measurement in the main field will directly affect the shimming to magnetic field. Above all, in view of the fact that the tiny error deviating from the ideal field will exert a severe influence on the beam, it is critical to raise the precision of measurement to a high level.     

Extraction System Design for CYCIAE-100 Project

The 100 MeV H^- cyclotron is designed to produce 200 μA intense protons with the energy varying from 75 MeV to 100 MeV. The extraction system consists of two sets of stripping probes, and the beam will be extracted after stripping 2 electrons. Depending on the data of 100 MeV equilibrium orbits and magnetic field, we calculate the location of stripping points at various energies. The extraction optics is investigated by numerical tracking starting from the equilibrium orbits of various energies down to 70 MeV,     

Wobbling Magnet Design for the Beam Line of CYCIAE-100

In most cases, the extracted beam from cyclotrons is in Gaussian distribution, while in many applications uniformly distributed beam is needed. On account of this, the wobbling magnet is designed to satisfy the need. The wobbling magnet can form a uniform rolling magnet field perpendicular to the beam transfer direction, which enables the beam through the wobbling magnet to turn with it. As a result, the uniformity of the beam will be improved. Figure 1 suggests the course of turning.     

Axial Injection System Design for CYCIAE-100 Project

A 100 MeV high intensity proton cyclotron is under design at CIAE to provide proton beams more than 200 μA, and will provide pulse beams. In order to get high average intensity and have the ability of providing pulse beams, the injection system has two schemes, which corresponds to 1# and 2# injection lines respectively, shown in Fig. 1. 1# line adopts bottom-up axial injection and it is designed to solve CW     

Preliminary Beam Line Design for CYCIAE-100 Project

The Beijing Radioactive Ion-beam Facility （BRIF） is one of the main projects at China Institute of Atomic Energy （CIAE）, and will be a versatile platform for nuclear study in China. As a major part of this project, the 100 MeV cyclotron is designed to provide protons beam from 75 MeV to 100 MeV continuously. When the construction is accomplished, the beam dump system will be used to debug the machine. Then the adjusted beam is transported to the target through the ISOL proton line, isotope study proton line, single energy neutron source proton line, mix energy neutron source proton line, biomedicine study proton line, single particle effect study proton line, and etc.     

100MeV强流质子回旋加速器主磁铁电磁力的数值模拟

本工作研究计算中国原子能科学研究院目前正在设计、建造中的100MeV强流质子回旋加速器CYCIAE-100主磁铁电磁力。计算中选用虚位移法和麦克斯韦应力张量法两种方法。在利用电磁场三维有限元分析程序计算得到紧凑型等时性回旋加速器主磁铁电磁场的基础上,先采用虚位移法估算电磁吸力,然后基于麦克斯韦应力张量法在MATLAB环境下编写数值计算程序,详细研究磁极和磁轭受到的电磁吸力。两种方法的计算结果接近。计算得到的主磁铁磁极间吸力大于磁极与盖板间吸力,二者之差由磁极和盖板间的螺栓承担。电磁力的计算结果为主磁铁结构变形计算和结构方案选取提供了依据。     

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.     

Stripping Extraction Simulation With COMA for CYCIAE-100

With multi-particle tracking code COMA, the process of stripping extraction for CYCIAE-100 is simulated and the position of stripping foil, which is got from the code CYCTR, is tested by COMA. Beam dynamics are studied in detail and the beam parameters after stripping are analyzed.     

Alternative of RF System Design for CYCIAE-100 Project

The RF system is a key part of the 100 MeV cyclotron in the upgrade project of HI-13 tandem accelerator, which includes RF generators, resonant cavities, transmission components, power supply and water cooling devices, computer control, and so on.     

Design of Radiation Monitoring and Safety System for CYCIAE-100 Project

Instantaneous radiation, mainly consisting of photon and neutron caused by beam loss, occurs during the debugging and operation of the 100 MeV cyclotron. Some components such as beam line, targets and collimators will generate residual radiation while they are impinged by the beam. And worse still, sometimes this may lead to the destruction of relevant devices. In order to avoid the radiation damage to the device as well as people involved, it is planned to implement a set of radiation monitoring and safety system, aiming to protect devices and ensure personnel safety by monitoring the parameters of the beam and dose rate of different areas.     

Preliminary Design of Central Control System for CYCIAE-100 Project

The central control system of the BRIF project is designed to provide a uniform control interface for the project facility＇s union operations. When the separate facility is in operation, its local control system will run independently. For union operation tasks, the local control systems of the facility involved will be connected by central control system; operations will be performed via the uniformed control interface. In the mean time, only operation commands from central Operating Interface will be valid.     

Study on the First Harmonic Bump for CYCIAE-100 Project

In cyclotrons particles have fixed static equilibrium orbits （EO） for different energies, the center of the orbit is also the center of the machine. In fact beam will not run along EO, but with betatron oscillation about EO. When the magnetic field has imperfect component, the center of the orbit will deviate from its original position. A first harmonic of amplitude B1 displaces the center of the equilibrium orbit by a distance     

CYCIAE-100回旋加速器低温冷板参数的蒙特卡罗模拟

基于气体分子运动理论建立了气体分子与低温冷板的碰撞模型,用蒙特卡罗方法模拟了放置在CYCIAE-100回旋加速器主磁铁谷区的低温冷板粘附概率、传输概率等参数,并计算其捕获系数。根据模拟计算结果设计加工了低温冷板及其性能测试罩,对低温冷板的抽速性能进行测试。抽速测试结果表明,用蒙特卡罗方法模拟的低温冷板参数与测试结果符合较好,相对误差为2%。     

Beam Dynamics Study for CYCIAE-100

To meet the need of the installation of the RF cavities, the hill gap is increased from 5 cm to 6 cm in the central region, and from 4 cm to -5 cm at the outer region so as to provide space for the RF liner. In the meantime, the space between the hills in the central region brings an easier engineering design of the centering coils. However, for such kind of compact machine, the fringe field at both sides of the sector magnet is quite important for the vertical focusing. So, the basic geometry is studied again and the field distribution is produced for beam dynamics study.