HIRFL-CSR可控硅脉冲二极磁铁电源预研究

简要介绍了兰州重离子加速器冷却储存环电源系统的概况 ,指出了电源系统建设中的主要难点和设计制作大功率可控硅脉冲电源样机的必要性 .并且详细介绍了已经完成的可控硅脉冲电源样机的实施方案、电路原理、关键技术和测试结果等 .

HIRFL-CSR电子冷却装置高精度螺线管线圈制作及磁场测量

采用特殊工艺制作了 HIRFL-CSR电子冷却装置冷却段高精度螺线管线圈 ,两个产生反向磁场的线圈同轴、平行地放置在特制的测量装置上 ,高精度霍尔探头位于测量装置中心平面上 ,探头测量面与测量装置轴线重合 ,测量单个线圈磁场的横向分量 ,调节线圈几何轴相对于测量装置轴线的夹角 ,测得线圈磁轴的偏角小于 1× 1 0 -3。

HIRFL-CSR主环加速腔系统设计

正在建设中的兰州重离子加速器冷却储存环 ( HIRFL- CSR)的主环加速腔系统用于将累积的重离子束流进行加速 .其频率范围为 0 .2 5 - 1 .7MHz,峰值电压为 8.0 k V.重点介绍了主环加速腔系统的设计及主要高频参数 ,包括高频腔体的设计及低电平控制部分的设计

HIRFL与CSR的匹配研究

国家重大科学工程HIRFL CSR冷却储存环计划主环CSRm利用已有的HIRFL作为注入器 ,为了更好地利用HIRFL加速器的能力 ,对这两台加速器的匹配在原来的初步考虑的基础上进行了较为详细的研究 ,提出了分别利用HIR FL自己的注入器SFC单独注入到CSR以及SFC加上主加速器SSC注入到CSR的两套方案 ,既可以提高HIRFL与CSR的总传输效率 ,又可以在SFC与CSR联合运行的同时使SSC与另建的小回旋加速器组合加速质子 ,从而充分提高HIRFL的运行效率

CSR放射性次级束流线

兴建中的放射性次级束流线 ,是兰州重离子冷却储存环中连接主环和实验环的束运线的主要部分 .描述它的结构、离子光学 ,以及二、三阶像差校正

CSR空间电荷效应的研究

针对兰州重离子加速器冷却储存环的流强设计 ,对其空间电荷效应进行了讨论 .随着流强增高和发射度降低 ,束流自作用场效应 (空间电荷效应 )逐渐显现 .散焦的空间电荷力造成的粒子自由振荡频移和束流包络增长 ,带来了不稳定因素 ,这些不稳定因素就限定了储存环的流强极限

HIRFL-CSR实验环电子冷却装置参数优化

以 4 0 0 Me V/u的 2 38U91 +为例 ,用电子冷却模拟程序计算了冷却时间随冷却段长度、冷却段磁感应强度、磁场平行度、电子密度、电子束半径、电子温度的变化规律 ,并分析了影响冷却时间的因素 ,获得了电子冷却装置最优参数。

HIRFL-CSR注入引出KICKER磁铁

以难度最大的快引出 KICKER磁铁为例 ,介绍了兰州重离子加速器冷却储存环注入引出 KICKER磁铁和电源设计的基本概念和所达到的指标

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

兰州重离子冷却储存环(HIRFL-CSR)超高真空系统

为了减少真空系统中残余气体分子对离子束造成的损失 ,要求重离子冷却储存环的平均工作真空度达到 3× 10 -9Pa( N2 等效压力 )。在大系统中达到如此高的真空度在我国尚属首例。围绕如何达到这个设计指标的问题 ,本文从真空系统布局、真空室材料、结构及加工焊接要求、降低材料表面出气率的措施、真空系统配置、烘烤系统设计、真空系统控制要求、真空压力分布等方面介绍了我们的设计方案

Nuclear matter at a HIRFL-CSR energy regime

We report some recent progress in constraining the symmetry energy E-sym(rho) at high densities using high-energy heavy-ion collisions. Circumstantial evidence of a soft E-sym(rho) at supra-saturation density is obtained by comparing the pion ratio pi(-)/pi(+) measured recently with FOPI at GSI and the IBUU04 model calculations. Detailed studies indicate that the power of determining the E-sym(rho)from pi(-)/pi(+) is enhanced with decreasing the beam energy to near the pion production threshold, showing a correlation to the increasing nuclear stopping. Among several heavy-ion reaction facilities in the world, the cooling storage ring (HIRFL-CSR), newly commissioned at Lanzhou, delivering heavy-ion beams up to 1 A GeV, to be coupled with advanced detectors will contribute significantly to further studies of the equation of state of asymmetric nuclear matter.

HIRFL-CSR complex

The construction and commissioning of HIRFL-CSR were finished in 2007. From 2000 to 2005 the subsystem and key devices of CSR were successfully fabricated, such as magnet, power supply, UHV system, e-cooler, electric-static deflector with the septum of 0.1 mm, and the fast-pulse kicker with the rise time of 150 ns. After that the CSR commissioning activities were performed in 2006 and 2007, including the accumulation of those heavy ions of C, Ar, Kr and Xe by the combination of stripping injection (STI) or multiple multi-turn injection (MMI) and e-cooling with a hollow e-beam, wide energy-range synchrotron ramping by changing the RF harmonic-number at mid-energy, the beam stacking in the experimental ring CSRe, the RIBs mass-measurement with the isochronous-mode in CSRe by using the time-of-flight method, and the ion beam slow-extraction from CSRm.

Timing system of HIRFL-CSR

The national science project HIRFL-CSR has recently been officially accepted. As a cyclotron and synchotron complex, it puts some particularly high demands on the control system. There are hundreds of pieces of equipment that need to be synchronized. An integrated timing control system is built to meet these demands. The output rate and the accuracy of the controller are 16 bit/mu s. The accuracy of the time delay reaches 40 ns. The timing control system is based on a typical event distribution system, which adopts the new event generation and the distribution scheme. The scheme of the tuning control system with innovation points, the architecture and the implemented method are presented in the paper.

Magnets for HIRFL-CSR rings

The magnet design, fabrication, and measurement of HIRFL-CSR (Heavy Ion Research Facility in Lanzhou Cooling Storage Ring) are presented. All magnets will be laminated And welded with an armor-coated surface between two big endplates made of sticking glue 0.5 mm-thick sheets. The dipole of CSRm was chosen an H type with an air circle on the pole to improve the field uniformity. The dipole of CSRe was chosen the C type with an air circle and two air slots on the pole to improve the field homogeneity. Its reproducibility of magnet to magnet was adjusted with inserting small laminating pieces before demountable pole ends to reach less than +/- 2 x 10(-4) at optimized field level. CSRm quadrupoles diameter is 170 mm and has two different lengths, and its endplates were made with punching pieces after coating with epoxy glue, there is chamfered directly on the pole ends to reduce 12th-order contribution of field and without the demountable pole ends. CSRe main quadrupoles diameter is 240 mm and has two different lengths, and its endplates were also made with punching pieces coated with epoxy glue, there is also chamfered directly on the pole ends to reduce 12th-order contribution of field like CSRm.

Charge stripping accumulation of light heavy ions in HIRFL-CSR main ring

The charge stripping injection method has been adopted for the accumulation of light heavy ions in HIRFL-CSR. This method has some special requirements for the accelerating particles, and at the same time the structure of the injection orbit has to be changed. In this paper, the design of the orbit has been presented, as well as the calculation of the beam line matching. According to the result of commissioning, stripping injection can accumulate the beam to a higher current.