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.     

HIRFL—CSR实验环电子冷却装置调试

HIRFL-CSR实验环电子冷却装置采用了能够产生空心电子束的电子枪。弯曲螺线管内采用了静电偏转电极，冷却段采用了独立的高精度螺线管串联产生纵向磁场的设计。测量了沿离子束运动方向冷却段磁场分布及磁场平行度、电子枪和收集器性能、300kV高压电源相关参数。结果表明，此装置达到了预期的设计目标。: In CSRe electron cooling device， a special electron gun which can produce variable profile electron beam with different size and density distribution was adopted for decreasing ion losses. Electrostatic bending device was used for reducing electron beam losses and improving vacuum condition. The instability of the electron beam is suppressed because the secondary electrons from collector would come back to the collector in the same orbit finally. Longitudinal magnetic field with parallelism better than 10-4 was achieved by adopting of independent high precise solenoid coils at cooling section. In this case， the r.m.s deviations of the transverse magnetic field at cooling section in horizontal and vertical direction are 3.298×10-5 and 2.458×10-5 respectively. The characters of the gun and collector were investigated. The results were presented and indicate that it achieves the design purpose very well.     

HIRFL-CSR主环电子冷却模拟计算

以¹⁶O⁸⁺为例,用电子冷却模拟程序计算了冷却时间随离子能量、初始发射度、初始动量分散、离子流强以及离子电荷态的变化规律,研究了储存环在冷却段的β函数和色散函数对冷却时间的影响.     

通用电子测量仪器自动测量系统的实现

现如今通用电子测量仪器具备了更宽的测量范围和更高的测量精度,因此通过构建基于这些仪器的自动测量系统来进一步提升测量效率就显得十分必要。以Agilent公司生产的E5072A矢量网络分析仪为例,利用LabVIEW开发平台和SCPI命令,构建了E5072A的自动测量系统。该系统能够极大的提高测量效率,移植性好,可以胜任一些耗时长、需定时测量等较繁复的测量工作。     

输出2TW/45fs的掺钛蓝宝石超短脉冲强激光系统

建立了一套基于啁啾脉冲放大技术,输出峰值功率达到2.8TW的掺钛蓝宝石激光系统。压缩脉冲的中心波长为785nm,能量为120mJ,脉冲宽度43.3fs,能量稳定性±5%,输出的光束质量M~2<1.5,脉冲重复频率10Hz,运转稳定可靠。整套激光系统实现了小型化,占用的光学平台不足10m²。     

浊点萃取-分光光度法测定水样中微量钒

提出了以5-Br-PADAP为络合剂、Triton X-114为表面活性剂的浊点萃取-分光光度法测定微量钒的新方法.探讨了溶液pH值,试剂浓度和平衡温度等实验条件对浊点萃取及测定灵敏度的影响.在优化的实验条件下,富集50mL样品溶液,钒的检出限为0.099 μg·mL-1,富集倍率为45.6.方法用于水样中测定微量钒的测定,结果满意.     

强场高次谐波辐射过程中的相位匹配

从实验上定性地研究了强 辐射过程中位相匹配的作用与影响,主要通过改变气体密度、激光强度和光束的共焦参数来研究相位对高闪谐波辐射的影响。从改善高次谐波辐射过程中的相位匹配来考虑,气体攻激光强度都有一最佳值。利用大的共焦参数,可以明显改善相位匹配,提高谐波输出的转换效率。     

内部带特征约束的任意平面域的三角形网格生成方法

基于Ｄｅｌａｕｎａｙ三角化方法 ,给出了内部带有任意复杂特征约束的任意平面域的三角形网格生成方法。区域内部特征约束可以是点、直线、圆、圆弧、平面样条曲线以及由它们组合构成的封闭环或者不封闭环。     

电子束在弯曲螺线管中的运动

 为研究HIRFL-CSR电子冷却装置中电子束穿过电子冷却装置中弯曲螺线管后电子横向能量的变化,用POISSON程序计算出弯曲螺线管的磁场分布,考虑了空间电荷效应,用数值方法模拟计算了电子在弯曲螺线管中的运动情况,得到了电子束横向能量变化最小时磁场各分量与电子束能量和弯曲螺线管几何尺寸之间的关系,并获得了电子束横向能量在束流截面的空间分布。