HIAF电子冷却装置高精度线圈磁轴测量

强流重离子加速器装置(HIAF)将采用电子冷却技术,降低重离子束流的发射度和动量分散,提高核物理及原子物理实验的精度与亮度。电子冷却装置的冷却段磁场均匀度是影响冷却效率的主要参数,HIAF电子冷却装置采用多个独立高精度线圈串联产生纵向磁场的设计,获得极高的冷却段磁场均匀度。本文介绍了一种测量高精度线圈磁轴偏角的装置,采用定位装置测量线圈的几何对称轴,通过旋转霍尔探头测量线圈中心平面上的径向与轴向磁场分布,再根据磁场测量数据计算出线圈磁轴与几何对称轴之间的偏角。实际测量表明该装置的磁轴偏角测量精度达到±0.10 mrad。测量得到的HIAF电子冷却装置冷却段线圈样品的磁轴偏角为(1.28±0.10)mrad,达到设计要求。

6-3 Closed Orbit Correction in Electron Cooler Section at CSRe

The injecting section and the cooler section are apart from each other at CSRm, while the electron cooler systemis installed at the injecting section of CSRe[1]. So for the CSRe we not only need to satisfy the beam injectingcondition but also need to satisfy the beam cooling condition. At present, we use the ramping bump and the kickerto inject beam, and after injection the bump disappear quickly and the beam goes to the cooling orbit and begincooling. This method has a disadvantage that the beam cooling condition cannot be satised until the bump isdown. In the past year, we try to nd a new method to correct the orbit of cooler section. Instead of using rampingbump we use the xed bump to satisfy the injecting and the cooling condition at the same time.

6-4 Longitudinal Electron Cooling Experiments at HIRFL-CSRe

The electron cooler was installed in one of the straight sections of CSRe which is used to provide high-qualitybeams for experiments. Longitudinally the dynamics of the cooling process have been studied for a series of electronbeam parameters and the friction force was measured with the aid of an RF-buncher for C6+ (122 MeV/u) and O8+(122 MeV/u) ions. The cooling time at different electron beam state have been measured, too.

Radiative Recombination Rates Enhancement at Low Energy Range in the Heavy Ion Storage Ring CSRm

Recombination of Ar^(14+),Ar^(15+),Ca^(16+) and Ni^(19+) ions with electrons has been investigated at low energy range at the CSRm.For each ion,the absolute recombination rate coefficients have been measured with electron-ion collision energies from 0 to 1000 meV which include the radiative recombination(RR)and also dielectronic recombination(DR)processes.In order to interpret the measured results.

HIAF电子冷却装置电子枪与收集器设计

The 100 kV electron cooler device is designed for the new project HIAF to improve beam quality in SRing[1,2].The design work of the electron gun and the collector for the cooler has been finished and the prototype has being manufactured in the workshop.The structures of the gun and collector are shown in Fig.1.

CSRm电子冷却高压系统设计

A new 20 kV high voltage system has been designed,developed and operated in CSRm cooler[1],in order to satisfy requirements of pulsed electron cooling experiments[2].Series of FuG high voltage power supplies were used,including a 20 kV main power supply,two 3.5 kV DC power supplies for the anode and suppressor,a3.5 kV power supply for the grid,a 3.5 kV power supply with the maximum current of 3.0 A for the collector and a 20 V power supply for the filament.The sketch of the power supply system is shown in Fig.1 and the main parameters of all power supplies are listed in Table 1.The residual ripple of the main power supply is around 10􀀀5(max.p-p value).A LAN interface was built in the main power supply,and other modules were communicated with the main power supply by optical fiber.A interlock system was used for the grid and anode power supplies,therefore the extracted electron beam can be cutoff quickly(<10 ms)while the leakage current of the main power supply is over threshold.

HIRFL-CSR电子冷却及运行

Two electron coolers installed at HIRFL-CSR are applied to cool the stored ions for beam accumulation at injection energies(CSRm),or for beam phase space compression and energy compensation on internal target experiments(CSRe).The operation of the electron coolers from Jan.2017 to Jan.2018 is summarized in Table 1.The total operation time is 2328 h and 264 h for CSRm cooler and CSRe cooler,respectively。