超导ECR源SECRAL轫致辐射谱的测量

热电子在ECR(Electron Cyclotron Resonance)源中有着非常重要的作用,为了研究ECR源的工作参数(微波功率、磁场等)对热电子的影响,我们对SECRAL(Superconducting ECR ion source with Advanced design in Lanzhou)等离子体在轴向发出的轫致辐射谱进行了系统的测量。从测得的轫致辐射谱中我们得到用来衡量热电子能量的参考量——光谱温度Tspe,并且对ECR源的几个工作参数与Tspe的关系进行了讨论。

5-19 Upgrade of Control System for SECRAL System

To improve the control efficiency of Superconducting Electron Cyclotron Resonance Ion source (SECRAL) forHeavy Ion Research Facility in Lanzhou (HIRFL), a upgrade version of control system for SECRAL system wasdesigned and set up in September 2014. The control software package is developed by Visual C++, which is ableto control and monitor all of the equipment for the SECRAL system with about 130 parameters. The previousanalog powers are discarded and four digital high powers are used newly at high voltage platform, which containtwo stove powers, a bias voltage power, and a sputter power. Moreover, four servo motors are added newly, whichcontain work gas, support gas, bias voltage, and sputter voltage. Reflecting vacuum value picturesquely, we plot agraph of inject vacuum, elicit vacuum, and beam vacuum against time. In order to prevent the misoperation whichmay cause the quench of the superconducting magnet, alarm and interlock-protection functions are added to thesoftware and hardware. Simultaneously, added stretch buttons are able to void accidental on-click that might bringabout serious outcome.

超导ECR离子源SECRAL-II最新调试结果

SECRAL-II is a third generation fully superconducting ECRIS(electron cyclotron resonance ion source)and nearly a duplicated one of SECRAL(superconducting electron cyclotron resonance ion source with advanced design in Lanzhou).They have the same magnet structure locating the axial solenoid coils inside the radial sextupole magnet.Compared with SECRAL,SECRAL-II has a slightly higher radial field and a larger plasma chamber,which makes it suitable for operation at 28 GHz.Meanwhile,the cryogenic system of SECRAL-II was built with integrated LHe recondensation cryogenic system and operated with 5 GM cryocoolers that are capable of providing a dynamic cooling capacity of more than 5 W to the 4.2 K reservoir.The main parameters of SECRAL-II are shown in Table 1.

Cryostat Design and Manufacture for SECRAL-I Superconducting Magnet

SECRAL(Superconducting Electron Cyclotron Resonance with Advanced Design in Lanzhou)is the first Su-perconducting ECR.ion source developed by IMP.The superconducting magnet of SECRAL was designed by the Institute of Modern Physics and manufactured by the former German company ACCEL.

Upgraded control system designed for SECRAL

To improve the accuracy and usability of the superconducting electron cyclotron resonance ion source with advanced design in Lanzhou(SECRAL), an upgraded version of the control system was designed and tested. This paper details the architecture of the optimized control system and presents the results of its use in the long-term operation of the accelerator. The control system software, based on Visual C++, was developed following the model-view-controller architecture design pattern. The data acquisition system was based on a field-programmable gate array integrated circuit. In addition, control strategies were optimized for higher operational stability. The upgraded control system was tested with a U^(33+) ion beam at SECRAL, where it provided a data acquisition time of less than 1 ms. The fast reaction time and highprecision data processing during beam tuning verified the stability and maintainability of the control system.

SECRAL控制系统软件设计(英文)

为提高兰州重离子加速器HIRFL的超导离子源SECRAL的控制效率,2011年7月份设计和建立了一个远程控制系统。作为该系统的一个部分,这个控制软件使用C++来实现。它能够控制和监视SECRAL的所有设备,大概110个参数。而且,为了控制不同种类的设备,该软件使用了很多不同的控制协议。除此以外,在SECRAL的运行过程中,若有误操作发生,便有可能导致超导离子源的失超。为了不发生这样的误操作,在硬件和软件中都增加了报警和连锁保护功能。该软件能够在1s内进行报警和连锁保护。同时,为了以后的分析,该软件能够将从控制器上每隔1s获取的数据存储到硬盘上。

SECRAL超导磁铁电源控制

超导离子源(SECRAL)的超导磁铁电源的控制非常重要。为防止超导磁铁的失超,需要对超导磁铁电源采用恰当的策略进行控制。在SECRAL系统中,4台电源分别为4个超导线圈独立供电,供电的电流大小不同,电流上升和下降的速率也不同。4个线圈的电流不平衡,将导致整个超导磁铁失超,所以超导线圈的电流上升和下降过程必须协同完成。为了提升磁铁电源的安全性和稳定性,设计并实现了一个远程控制系统。在硬件方面使用串口通讯服务器实现TCP/IP网络通讯与RS232串行通讯间的协议转换。软件使用VC++直接对串口编程完成。该系统能够自动完成4台电源的同步操作,简化了超导离子源SECRAL的调试过程,提高了操作过程中的安全性。

基于C#的SECRAL-Ⅱ数据归档系统

超导电子回旋共振离子源II(Superconducting Electron Cyclotron Resonance ion source with Advanced design in Lanzhou-II,SECRAL-II)控制系统采用实验物理与工业控制系统(Experimental Physics and Industrial Control System,EPICS)架构,其中数据归档子系统主要用来存储离子源电源、真空、束诊、水压等数据,便于技术人员进行在线和离线数据分析,是其控制系统的重要组成部分。EPICS自带的Channel Archiver存储格式固定,无法满足用户的实际使用需求。使用C#实现了EPICS架构下变量(Process Variable,PV)历史数据的存储功能,结合Oracle数据库技术,使得在存储PV变量的策略上可以更加灵活控制。同时,实现了基于超文本预处理器(Hypertext Preprocessor,PHP)的文件管理系统,用于历史数据文件的管理。测试及运行结果表明系统可以很好地满足研究人员对于历史数据的归档要求和研究需求。

SECRAL在18GHz频率下产生强流高电荷态离子束的初步结果(英文)

A Superconducting ECR ion source with Advanced design in Lanzhou （SECRAL） was successfully built to produce intense beams of highly charged ions for Heavy Ion Research Facility in Lanzhou （HIRFL）.The ion source has been optimized to be operated at 28GHz for its maximum performance.The superconducting magnet confinement configuration of the ion source consists of three axial solenoid coils and six sextupole coils with a cold iron structure as field booster and clamping.For 28GHz operation,the magnet assembly can produce peak mirror fields on axis 3.6T at injection,2.2T at extraction and a radial sextupole field of 2.0T at plasma chamber wall.A unique feature of SECRAL is that the three axial solenoid coils are located inside of the sextupole bore in order to reduce the interaction forces between the sextupole coils and the solenoid coils. During the ongoing commissioning phase at 18GHz with a stainless steel chamber,tests with various gases and some metals have been conducted with microwave power less than 3.2kW and it turned out the performance is very promising.Some record ion beam intensities have been produced,for instance,810eμA of O7+,505eμA of Xe20+,306eμA of Xe27+,21eμA of Xe34+,2.4eμA of Xe38+ and so on.To reach better results for highly charged ion beams,further modifications such as an aluminium chamber with better cooling,higher microwave power and a movable extraction system will be done,and also emittance measurements are being prepared.

控制系统2018年进展

In 2018,the control group completed some projects include some new projects and some renovation projects on HIRFL.In particular,we completed the renovation of EPICS for SFC and BL power supply(include digital power supply and analog power supply),upgraded the control system of SECRA2,developed the GUI of BL0,SFC,SECRAL2,Cooler,etc.developed operation monitoring system of HIRFL,formed a relatively complete EPICS system structure and software function,and new slit control for the 320 kV experimental platform.At same time,we are developing some new technology for HIAF such as the cloud technology and cloud computing platform the newly developed archive engine base on MongoDB.We carried out the following works。

2018年在线离子源运行报告

HIRFL accelerator facility has been operated with two ion sources as its pre-injectors,which are LECR3 and SECRAL-II.In 2018,there were 19 kinds of ion beams delivered successfully,and the service time of the two sources are 4594.5 and 2231 h respectively,amounting to 6825.5 h in total,in which SECRAL and LECR3 provided 4 and 1 kinds of metallic ion beams respectively,and the total service time for the metallic ones is 2322 h,accounting for 34%of the total service time.Table 1 summarizes the main information about the ion beams delivered by the two ion sources.

2017年在线离子源的运行报告

Considering that all the ion species provided by LAPECR1 can also be supplied by LECR3,the LAPECR1 was removed during the summer maintenance period in 2017.Therefore,HIRFL-CSR has two online ion sources presently,which are LECR3 and SECRAL.In 2017,16 kinds of ion beams have been delivered successfully,and the total service time of the two on-line ion sources is 6622.5 h,3938.5 h and 2684 h for LECR3 and SECRAL,respectively.In this year,the service time of the two ion sources contributed to metal ion beams amounts to 2028 h,corresponding to 30.6%of the total service time.

超导源和常规源控制系统改造

To improve the control efficiency of Ion source for HIRFL,upgrade versions of control systems for ECR and SECRAL were designed and set up in August 2017.The control software packages were developed by Visual C++platform.The control softwares were designed as independent classes.Thus,new devices can be easily added.The control systems were completed and became operational in September 2017.The developed systems have been used successfully for providing various types of beams for physical experiments.

离子源室2018年工作总结

Ion sources have fundamental impacts to the operation status of existing facilities and research progress of those under construction.In 2018,totally 6825.5 h beam time has been made by the ion sources for HIRFL operation,contributed by superconducting ECR ion source SECRAL/SECRAL-II with 2231 h and room temperature ECR ion source LECR3 with 4594.5 h respectively.Totally 19 beams of different ions or energies have been delivered to the downstream accelerators for diverse experiments covering the research fields of nuclear physics,material irradiation,medical application and so on.Highlights of the on-line ion source operation are the successful production of stable 7Li3+and 181Ta31+ion beams for HIRFL,and the on-line operation of SECRAL-II by replacing the former injector ion source SECRAL(Fig.1).

Operational Report of On-line Ion Sources in 2019

In 2019,the service time of the two on-line ion sources,LECR3 and SECRAL,is 3642.5 and 3617 h respectively,amounting to 7259.5 h.There are 19 kinds of ion beams delivered to the accelerator successfully.