高电荷态ECR离子源——LECR3

研制成功了一台新的高电荷态ECR离子源,该离子源主要为原子物理实验提供各种高电荷态离子束流,是基于中国科学院近代物理研究所14.5GHz高电荷态ECR离子源设计建成的,同时在该离子源中应用多种有利于提高束流强度的技术,设计时考虑到采用双频加热,试图通过试验双频加热模式来提高高电荷态离子的产额,并设计建造了一套束流聚焦分析系统,以提高电荷态分辨率和束流传输效率.     

DECRIS-4离子源的初步测试结果

The ECR ion source DECRIS-4 has been designed and constructed at the FLNR JINR to be used as a second injector of heavy multiply charged ions for the U-400 cyclotron.The design of the magnetic structure of the source was based on the idea of the so-called"magnetic plateau".The axial magnetic field is formed by three independent solenoids enclosed in separated iron yokes.As a result the superposition of the coils and hexapole magnetic fields creates the enlarged resonance volume.The first experiments showed that the source was able to produce more than 300eμA of Ar~(8 ) when only 100W of microwave power was used. During the last experiment almost 500eμA of Ar~(8 ) was extracted with the same power.In this paper we will present the preliminary results with other gaseous ions,such as oxygen,krypton and xenon.     

强流RF 离子源研制及初步实验

介绍了RF离子源驱动源的结构设计及RF线圈的热流固耦合分析。RF离子源采用外置天线的感应耦合方式,采用双射频驱动源设计,每个射频驱动源功率约60kW,总体功率为120kW,可产生均匀高密度的等离子体,以满足稳定的长脉冲运行的要求。在完成上述工作的基础上完成了RF离子源样机组装和初步实验测试。     

Operation of LECR2 for HIRFL Facility

LECI:L2 (Lanzhou Electron Cyclotron l:tesonance No.2) is a 14.5 GHz ECR ion source (ECRIS) used at the axial injection beam line as an external ion source of the injector SFC. In 2003, to be adapted with the SFC reconstruction and modification, the source was moved from the north side of the beam line to the east side, and the other source LECR1 worked at 10 GHz was removed from the beam line. At the moment LECR2 is the only ion source in service for HIRFL accelerators.     

ORNL-HRIBF 6GHzECR离子源的最新结果

Experimental studies were conducted to characterize and improve the performance of the flat-B ECR ion source.The emittance of the source was investigated for the first time.The output beam currents of high-charge-states of Ar(q>8)were nearly doubled by increasing the plasma electrode aperture from 4mm to 6mm in diameter.To investigate possible enhancements with broadband microwave radiation,a"white"Gaussian noise generator was employed with a TWT amplifier to generate microwave radiation with a bandwidth of～200MHz.The performance of the flat-B ECR ion source was found to be much better with narrow bandwidth radiation when the source was operated in the flat-B region.However,the ion beam intensities and charge state distributions were improved with the broadband radiation when the source was tuned off the flat-B region.     

激光离子源的首次在线实验结果

介绍了在线同位素分离器使用激光离子源的重要性、激光离子源原理和相关激光技术,以及热毛细管激光离子源和靶室的结构.在首次在线实验中使用50MeV/u ¹⁸O+^natTa→¹⁶⁷Yb(T_1/2=17.5m)反应道,实现了加速器、分离器和激光系统的联合运行.通过测量分离后产物的γ谱,确定了分离后的¹⁶⁷Yb的产额,并与从产生截面、束流强度、收集时间和靶厚度计算得到的产生率相比,得到总分离效率约为0.2%.通过有激光与无激光条件下测量的γ谱中¹⁶⁷Yb与¹⁶⁷Lu相应峰下面积比值K得到元素选择性η为3.2.发现了新的¹⁶⁷Yb的长寿命高自旋的同质异能态,分析了提高效率的途径.     

氩气驱动液态锂回路的总体设计及初步运行结果

为了研究等离子体与自由液态锂表面相互作用的物理过程,建立了用氩气驱动的液态锂回路装置。介绍了建立的液态锂回路装置的组成部分、技术参数及运行原理。此回路主要由主回路、等离子体与液态锂相互作用试验段和单阴极高密度等离子体发生装置三部分组成。目前,此回路已取得一些初步的模拟结果和实验结果。     

EAST辐射偏滤器充气系统改造及初步实验结果

介绍了EAST偏滤器充气系统的改进措施,压电阀与冷屏一起安装在EAST颈管中,以缩短充气管道,将充气系统的延迟时间减少约200ms。冷屏起冷却阀门并屏蔽电磁场的作用。讨论了在准稳态条件下,延迟时间给偏滤器热流反馈控制带来的负面效应。在中性束加热条件下,通过在外靶板注入Ar/D2(1:4)混合气体研究了靶板离子饱和流和热流分布的变化及充气对主等离子体的影响,得到了靶板离子饱和流显著降低、热流减少的结果。     

ATOMKI-ECRIS由离子源向等离子体装置的改造

In order to extend the capabilities of the ATOMKI-ECRIS it is being transformed into a modified plasma device by changing its three main components with new ones.The cylindrical plasma chamber is replaced by a larger one(ID=10cm,L=40cm).A new NdFeB multi-pole radial trap was designed and purchased.The basic configuration is 6-pole,but 8-or 12-pole arrangements can also be formed later.The Dresent microwave source(2000W,14.5GHz)and two additional low-power,wide frequency TWT amplifiers give many opportunities to form plasmas with different sizes and characters. Actually a new facility with two sharply different operation modes is being established.All the modifications are reversible so the transformation of the ECRIS into this new device or back can be easily done.     

LAPECR2离子源在320kV高压平台上的试运行

The high charge state all permanent Electron Cyclotron Resonance Ion Source(ECRIS)LAPECR2 (Lanzhou All Permanent magnet ECR ion source No.2)has been successfully put on the 320kV HV platform at IMP and also has been connected with the successive LEBT system.This source is the largest and heaviest all permanent magnet ECRIS in the world.The maximum mirror field is 1.28T(without iron plug)and the effective plasma chamber volume is as large as (?)67mm×255mm.It was designed to be operated at 14.5GHz and aimed to produce medium charge state and high charge state gaseous and also metallic ion beams.The source has already successfully delivered some intense gaseous ion beams to successive experimental terminals.This paper will give a brief overview of the basic features of this permanent magnet ECRIS.Then commissioning results of this source on the platform,the design of the extraction system together with the successive LEBT system will be presented.     

ANL的2Q-LEBT装置的进展报告

The concept for a 2 charge state injector for a"RIA type"accelerator has been presented.Progress toward an operational prototype 2Q-LEBT system at Argonne National Laboratory(ANL)is under way. The existing BIE 100 all permanent magnet ECR has been placed on a high voltage platform capable of a combined>100kV with q/m separation at ground level.Remote control of the devices on the platform has been implemented.Other components of the facility are currently being tested.The components of an achromatic bending system are currently being procured.This paper will present recent work at the facility as well as preliminary development of solid materials using the BIE 100.     

LBNL14GHz离子源AECR-U的最新进展

A radial sputter probe has been developed for the AECR-U as an additional method of producing metal ion beams.Negative voltage is applied to the probe to incite collisions with target atoms,thereby sputtering material into the plasma.The sputter probe is positioned through one of the 6 radial access slots between the permanent hexapole structure of the AECR-U.The probe position can be varied with respect to the inner edge of the hexapole magnet structure.Charge state distributions and peak beam intensities at bias voltages up to-5kV were obtained for gold samples at varying distances of the probe with respect to the plasma.For high charge states production the radial position with respect to the plasma was more sensitive than for the medium and lower charge states.For high charge state ion production the probe was optimized at a distance of 0.6cm inside the chamber wall(4.1cm from the center of the chamber).Stable beams with peak intensities of up to 28eμA of Au~(24 ) and 1.42eμA of Au~(41 ) have been produced using the sputter probe technique. In addition,a solid state circuit under development by Scientific Solutions,Inc which provides a bandwidth up to 100MHz was used to drive the 14GHz klystron amplifier for the LBNL AECR-U ion source.Various broadband and discrete heating modes were tested and the results for high charge state ion production were compared with single frequency heating.     

Afterglow工作模式下ECR离子源脉冲束的产生

为满足国家大科学工程兰州重离子冷却储存环的要求,在14.5GHz ECR 离子源上进行afterglow工作模式的实验,首次产生了高电荷态脉冲束流Ar¹¹⁺和Ar¹²⁺,给出了初步实验结果,并对结果进行了分析和解释.     

强流高电荷态Pb离子束的产生与优化研究

随着原子物理及表面物理研究的发展,电荷态金属离子束的需求日益增多. 近来,中国科学院近代物理研究所,14.5GHz LECR3,离子源实验平台上, 以炉子法产生的铅离子束作为研究对象, 进行了一系列,ECR,离子源关键参数(如：磁场、炉子功率、掺气等)影响高电荷态铅离子束产额的实验研究, 在此基础上, 调整优化了,LECR3,离子源的状态参数, 从而获得了强流高电荷态铅离子束,18eμa ²⁰⁷Pb³⁰⁺,和6.7eμa ²⁰⁷Pb³⁷⁺.     

ECR离子源六极永磁体的设计研究

分别从材料、结构、尺寸等方面全面地研究了Halbach结构六极永磁铁的设计方法.针对个别磁块可能存在的退磁问题给出了相应的解决方案.通过优化结构,使六极磁铁在离子源等离子体弧腔内壁产生的磁场达到最大.用POISSON,PERMAG,TOSCA等多个磁场模拟程序计算模拟了六极磁场的大小与分布,并给出了一些相应的曲线