HIRFL-CSR PHYSICS PROGRAM

The research activities at HIRFL-CSR cover the fields of the radio-biology, material science, atomic physics, and nuclear physics. This talk will mainly concentrate on the program on nuclear physics with the existing and planned experimental setups at HIRFL-CSR.

OVERVIEW ON THE HIRFL-CSR FACILITY

The status of the HIRFL (Heavy Ion Facility in Lanzhou) - Cooler Storage Ring (CSR) at the IMP is reported. The main physics goals at the HIRFL-CSR are the researches on nuclear structure and decay property, EOS of nuclear matter, hadron physics, highly charged atomic physics, high energy density physics, nuclear astrophysics, and applications for cancer therapy, space industries, materials and biology sciences. The HIRFL-CSR is the first ion cooler-storage-ring system in China, which consists of a main ring (CSRm), an experimental ring (CSRe) and a radioactive beamline (RIBLL2). The two existing cyclotrons SFC (K=70) and SSC (K=450) are used as its injectors. The 7MeV/u12C6+ ions were stored successfully in CSRm with the stripping injection in January 2006. After that, realized were the accelerations of C-12(6+), Ar-36(18+), Kr-78(28+) and Xe-129(27+) ions with energies of 1GeV/u, 1GeV/u, 450 MeV/u and 235 MeV/u, respectively, including accumulation, electron cooling and acceleration. In 2008, the first two isochronous mass measurement experiments with the primary beams of Ar-36(18+) and Kr-78(28+) were performed at CSRe with the Delta p/p similar to 10(-5).

An untuned MA-loaded cavity for HIRFL-CSR

In order to realize high energy density physics and plasma physics research at HIRFL-CSR, a magnetic alloy (MA)-loaded cavity has been studied. According to the theoretical calculation and simulation for the MA-loaded cavity, we achieved a better result. The MA-loaded cavity had a higher Qf value, with a higher shunt impedance and a higher accelerating gradient. The accelerating gradient was about 95 kV/m at 1.8003 MHz, 130 kV/m at 0.9000 MHz. Compared with the ferrite-loaded cavities that are used at HIRFL-CSR, with about 10 kV/m accelerating gradient, the MA-loaded cavity obviously has an advantage. The results of the theoretical calculation and the simulation, which meet the design requirements are in good agreement.

利用HIRFL-CSR开展分子离子复合离解研究的可行性分析；Feasibility Analysis of Studying Dissociative Recombination Processes of Molecular Ions at HIRFL-CSR

介绍了储存环高精度分子谱学研究的科学意义、国内外研究现状和利用HIRFL-CSR开展该项研究的优势,着重论证了HIRFL-CSR分子离子注入实验环的总体设计方案和技术方案。通过在HIRFL-CSR实验环上增建一条分子离子注入线,将实验环改造成能兼顾现有物理实验和大分子物理研究的综合性研究平台,为分子离子复合离解研究提供良好的技术支撑。特别是质量数大于70的分子离子,能显著提高其能量分辨。

兰州重离子加速器团簇内靶装置控制系统设计；Design of a Control System for HIRFL-CSRe Internal Target Facility in Lanzhou

介绍了兰州重离子加速器冷却储存环(HIRFL-CSR)的实验环(CSRe)团簇内靶装置控制系统的设计。该内靶系统由多种设备构成,包括喷嘴测温与加热控制子系统、真空与阀门监测/控制子系统、分子泵监测与控制子系统、数据处理与流程软件子系统等部分。该系统在内靶实验中工作状态良好,满足了内靶实验的需求。在该控制系统的支持下,2010年1月第一轮辐射电子俘获物理实验顺利完成。

The stripper design and test at HIRFL-CSR

Charge stripping is employed to produce multi-charged ions for injecting the cooling storage ring After penetrating through the carbon foil, the widened distribution of ion charge states poses a limit to the ion injection Therefore, the carbon foil plays a key role in the charge snipping injection In this paper, foul strippers for Heavy Ion Research Facility at Lanzhou (HIRFL) and Cooling Sun age Ring (CSR) are introduced The charge state distribution of the stripped ions is measured and the stripping efficiency of the foils is investigated The experimental results are consistent with the theoretical values

Progress in HIRFL-CSR

The HIRFL complex, the commissioning of HIRFL-CSR, and the nuclear physics experiments at HIRFL-CSR are briefly introduced.

HIRFL真空远程控制系统设计

为满足HIRFL-CSR工程对HIRFL真空系统的要求,达到远程监测控制的目的,提高整体运行效率,设计实现了一套这样的远程控制系统。文章简要介绍了以MSP430F149为核心设计的真空控制模块,及其在HIRFL真空远程控制系统中的应用。着重介绍了控制模块的硬件组成以及软件控制程序设计。该系统通过Intranet网络连接各种设备,实现了对HIRFL真空系统的远程监测与控制。

HIRFL微束辐照装置偏转磁铁的安装准直；Alignment of Dipole Magnet in Micro-beam Line of HIRFL

微束辐照装置是将辐照样品的束斑缩小到μm量级,能够对辐照粒子进行准确定位和精确计数的实验平台,是开展辐照材料学、辐照生物学、辐照生物医学和微加工的有力工具。μm量级的束流对设备的准直安装也提出了极高的要求,对于HIRFL系统微束线上的二极磁铁,由于其所在位置的空间相当狭小,使得设计就位时磁铁的位置及角度与地面做基准时的不同,这给安装准直工作带来了挑战。通过引入变化的基准坐标值的办法,有效解决了这一难题,使全部磁铁安装误差都控制在了要求的公差范围之内。

HIRFL大型真空系统；The vacuum system of HIRFL

HIRFL是兰州重离子加速器装置的英文首字母缩写,其真空系统是一个大型综合性系统。HIRFL由离子源、扇聚焦回旋加速器SFC、分离扇回旋加速器SSC和多用途的重离子冷却储存环(HIRFL-CSR)组成。多条束流运输线将这些加速器连接在一起,同时将各种重离子束流送往10多个实验终端。根据加速离子和束流寿命的需要,对各加速器真空度的要求是不同的:SFC已有50多年的历史,经过3次升级改造,真空度从10-4 Pa提高到10-6 Pa;建于上世纪八十年代的SSC真空度也为10-6 Pa;而两个重离子冷却储存环(CSRm和CSRe)的真空度达到10-10Pa以保证重离子有足够长的储存寿命。多条连接束运线根据不同实验终端的要求,其真空系统的设计方案也不同,文中列举了微束实验终端采取的防振措施;为充气反冲谱仪设计的清洁、大流量真空差分系统及为重离子治癌等终端设计的超薄壁扫描磁铁真空管道等。

HIRFL-CSR二极磁铁电源的研制；Development of Power Supply for HIRFL-CSR Dipole Magnet

研制了兰州重离子加速器冷却储存环(HIRFL-CSR)二极磁铁电源,提出了一种基于晶闸管相控整流技术和IGBT脉宽调制(PWM)变换技术的同步加速器二极磁铁电源的设计方案,分析、仿真了其工作原理,并设计、生产了1套完整的电源样机。经现场试验、长期运行及测试,电流稳定度<±5×10-5/8h,跟踪精度<±2×10-4,电流纹波<1×10-5。该方案满足HIRFL-CSR二极磁铁对电源技术指标的要求。

HIRFL-CSR电子冷却束流位置测量系统；A Beam Position Monitor System for Electron Cooler in HIRFL-CSR

高效率的电子冷却过程,要求电子束与离子束位置平行且重叠。为了同时测量电子束与离子束的位置,在HIRFL-CSR电子冷却装置上研发了以容性圆筒形极板为感应电极的束流位置探测系统。系统测量束流通过探针时产生的脉冲感应信号,并进行傅里叶变换得到频谱信号,分析4个不同电极上频谱信号强度获取束流的位置信息。测量结果表明,该束流位置探测系统测量准确,为定量研究储存环离子累积和电子冷却过程与两种束流相对位置及角度的依赖关系提供了条件。

HIRFL-CSR电源数字控制系统硬件平台设计

论述用于兰州重离子加速器冷却存储环(HIRFL-CSR)磁铁电源控制系统的数字控制系统硬件平台设计。该系统基于1mmBGA封装的ALTER corporation的cycloneⅢFPGA芯片,嵌入运行数字调节器软件算法,满足了针对具体被控对象参数要求的调节控制。用ARM(Advanced RISC Machines)作调节控制系统的核心处理器,完成系统的多线程任务处理;同时嵌入千兆光纤接口,实现外接DSP板处理数据的直接传输,提高了系统的实时性。该硬件平台实现了HIRFL-CSR电源系统的稳定、可靠和实时控制。

Design studies on the 4 pi gamma-ray calorimeter for the ETF experiment at HIRFL-CSR

A high detection efficiency calorimeter which is used to detect gamma-rays with energies from 1 MeV up to 10 MeV as well as light charged particles has been proposed. Design of the geometry, results of the crystal tests and Monte Carlo simulations are presented in this paper. The simulation results confirm that the calorimeter can obtain high detection efficiency and good energy resolution with the current designed geometry. And the calorimeter is competent for the future External Target Facility (ETIF) experiments.

An untuned MA-loaded cavity for HIRFL-CSR

In order to realize high energy density physics and plasma physics research at HIRFL-CSR, a magnetic alloy (MA)-loaded cavity has been studied. According to the theoretical calculation and simulation for the MA-loaded cavity, we achieved a better result. The MA-loaded cavity had a higher mu Q f value, with a higher shunt impedance and a higher accelerating gradient. The accelerating gradient was about 95 kV/m at 1.8003 MHz, 130 kV/m at 0.9000 MHz. Compared with the ferrite-loaded cavities that are used at HIRFL-CSR, with about 10 kV/m accelerating gradient, the MA-loaded cavity obviously has an advantage. The results of the theoretical calculation and the simulation, which meet the design requirements are in good agreement.