离子注入用高低温变温靶室

本文介绍了一个在77-800K范围可变温度下进行离子注入和就地电学测量的靶室。该靶室曾为金属、硅化物以及某些超导材料的离子束混合实验在10W左右的束流功率下使用了几年,温度漂移在±3K。     

Kαand Kβ X—ray energy shift and broademing for Ni^＋q ion bombardment on Cu target

Relative to bombardment,energy shift and broadening of Kα and Kβ X-ray lines of Cu are observed in Ni^ q ion bombarding Cu atoms.This is possible due to multiple ionization of Cu in Ni^ q bombardment.Incresae in KX-ray transition energy and its broadening are expected when one or several of outer shielding electrons are removed from atom.     

Ar离子束辐照下多壁碳纳米管网络的导电性增强

用Ar离子束辐照800K高温下的多壁碳纳米管(MWCNT)网络,注量为2×1016/cm2时,MWCNT网络的导电性提高～80%。实验结果表明,离子束辐照可通过在多壁碳纳米管间的引入连接改善多壁碳纳米管间的电学接触,制备高导电性的透明碳纳米管网络。     

10cm×30cm矩形射频离子束源的研制

本文介绍了射频(Radio frequency,RF)感应耦合等离子体(Inductive couple plasma,ICP)离子束源的设计研究.该射频离子束源可工作于Ar,在使用四栅引出系统时,可获得100-1000 eV的离子束.当射频功率为900 W,在Ar为工作气体时,束流可达到600 mA.在束流为120 mA时,距源26 cm处,在主轴方向27 cm的范围内不均匀性小于±6%.该离子束源可作为大面积离子束刻蚀、离子束抛光等的离子束源.     

Study on Mutagenic Breeding of Bacillus Subtilis and Properties of Its Antifungal Substances

Bacillus subtitles JA isolated by our laboratory produced a large amount of antifungal substances, which had strong inhibitory activity against various plant pathogenic fungi,such as Rhizoctonia solani, l?usarium graminearum and so on. Ion beam implantation as a new mutagenic methods was applied in our studay. After B. subtitles JA was implanted by N^ ions,a strain designated as B. subtitles JA-026 was screened and obtained, which had a higher ability to produce those antifungal substances. A series of experiments indicated that the antifungal substances were thermostable and partially sensitive to proteinases K and tryproteinase. When the fermentating broth was fractionated with ammonium sulphate of a final saturation of 70%,the precipitate-enhanced inhibitory activity while the supernatant lost this activity. It appeared that the antifungal substances were likely to be protein.     

强脉冲离子束辐照混合的RBS研究

采用卢瑟福背散射(Rutherford backscattering spectroscopy,RBS)方法对强脉冲离子束辐照Ti/Al、Al/Ti和Ni/Ti三组薄膜/衬底体系所形成的混合层进行了研究.在Ni/Ti组合中形成了厚度比离子射程大得多的、混合度较高的梯度混合层.发现熔融态混合的程度不仅取决于两材料在熔融态的表面张力的差别,而且取决于它们熔点的差异.这两个参量较接近的混合程度较好.     

离子束分析进展

1983年在美国亚里桑那州州立大学召开了第六届国际离子束分析会议。这次会议的侧重方向是低能离子散射。近年来,由于超高真空技术、高速计算机、飞行时间方法、离子源等技术的发展和应用,散射截面、射程、阻止本领等各种基本参数的精确化,促进了低能离子散射技术的发展,使它成为表面结构分析中的重要手段。必须指出,上述多方面技术的进步所产生的影响,不仅仅局限于低能离子散射,而是遍及离子束分析的整个领域。     

IS-A离子源的实验研究和初步应用

为加热HT-6M托卡马克等离子体而研制的IS-A十厘米双潘宁离子源具有强流、大功率、高质子比等特点。经过进一步的发展,该源可以引出多种气体离子束,以满足不同实验的需要。本文详细地研究了几何结构和运行条件对源等离子体的影响。报道了该离子源在其它领域中的初步应用。     

C—N多晶的离子束合成及分析

介绍了用离子束合成法研制新型材料β－Ｃ３Ｎ４的条件及过程，用ＲＢＳ、ＸＲＤ等手段分析研究该方法生成物的配比、结构和物相，观察到ＣＮ化合物多晶。     

Ion beam propagation and focusing

Inertial confinement fusion with ion beams requires the efficient delivery of high energy (1 MJ), high power (100 TW) ion beams to a small fusion target. The propagation and focusing of such beams is the subject of this paper. Fundamental constraints on ion beam propagation and focusing are discussed, and ion beam propagation modes are categorized. For light ion fusion (LIF), large currents (2–33 MA) of moderate energy (3–50 MeV) ions of low atomic number (1A12) must be directed to a target of radius 1 cm. The development of pulsed power ion diodes for LIF is discussed, and the necessity for virtually complete charge neutralization during transport and focusing is emphasized. Fornear-term LIF experiments, the goal is to produce pellet ignition without the standoff needed for the ultimate reactor application. Ion diodes for use on Sandia National Laboratories Particle Beam Fusion Accelerators PBFA-I (2–4 MV, 1 MJ, 30 TW, operational) and PBFA-II (2–16 MV, 3.5 MJ, 100 TW, scheduled for operation in 1985) are discussed. Ion beam transport from these diodes to the pellet is examined in reference to the power brightness . While values of =2–5 TW/cm²/sr have been achieved to date, a value of 100 TW/cm²/sr is needed for breakeven. Research is now directed toward increasing , and means already exist (e.g., scaling to higher voltages, enhanced ion diode current densities, and bunching), which indicate that the required goal should be attainable. Forfar-term LIF applications, the goal is to produce net energy gain with standoff suitable for a reactor. This may be achieved by ion beam transport in preformed, current-carrying plasma channels. Channel transport research is discussed, including experiments with wire-initiated, wall-initiated, and laser-initiated discharge channels, all of which have demonstrated transport with high efficiency (50–100%). Alternate approaches to LIF are also discussed, including comoving electron beam schemes and a neutralized beam scheme. For heavy ion fusion (HIF), moderate currents (10 kA) of high energy (10 GeV) ions of high atomic number (A200) must be directed to a target of radius 0.3 cm. Conventional accelerator drivers for HIF are noted. For a baseline HIF reactor system, the optimum transport mode for low charge state beams is ballistic transport in near vacuum (10^–4–10^–3 Torr lithium), although a host of other possibilities exists. Development of transport modes suitable for higher charge state HIF beams may ultimately result in more economical HIF accelerator schemes. Alternate approaches to HIF are also discussed which involve collective effects accelerators. The status of the various ion beam transport and focusing modes for LIF and HIF are summarized, and the directions of future research are indicated.     

硅基体的金属钼反冲注入

在某基体的表面,真空蒸镀一层其它材料的薄膜,用离子轰击时将引起原子级联碰撞而导致基体原子和薄层原子的混合,特别是在界面区域的混合。所谓反冲注入是指薄层原子在此过程中进入基体的现象。目前,离子束混合已开始应用到半导体器件及金属等材料改性的领域中。     

高功率脉冲离子束注入初步研究

离子注入用于半导体器件和大规模集成电路的生产中,显示出这种工艺的许多优越性。七十年代初期,哈威尔实验室等研究部门开始进行离子注入技术在非半导体材料中的应用研究。大量实验结果表明,仅几千埃的注入深度就能对金属材料的磨损和抗氧化性能起积极的影响,如一定浓度的氮离子注入钢能显著提高钢材的耐磨性,而且小于0.5μm的注入层能使20μm深度处的耐磨性仍有改善;适当剂量的Cr和Zr注入氧化铝陶瓷中,能起到硬化作用;     

离子注入、分析联用靶室

近年来,离子注入和离子束分析技术,应用相当广泛,已扩展到许多新的领域,形成了一种多学科性的边缘学科。 离子注入已作为一种成熟的技术广泛地应用在半导体工业上,在半导体制造工艺方面,它比传统的热扩散法显示出多方面的优越性。同时在材料改性方面也引起人们的极大兴趣,许多金属部件在实际使用时起作用的是金属表面的性质,而离子注入正好是能够改变金属表面性质(如硬度、磨损、腐蚀等)的有效途径。此外,离子注入技术用来改变光学表面指定区域的反射率、折射率,这在“集成光学”中是一项有效技术,也有人利用离子注入技术研制记忆元件(如磁泡)以及提高超导材料的超导性能等。     

航空轴承表面改性的研究

本文介绍了采用离子注入的两种工艺路线(直接注入和离子束混合),对两种航空轴承材料(GCr15和Cr4Mo4V)经过单一元素或多元素组合的注入或混合处理后性能的影响。试验结果表明:两种工艺对两种材料表面改性的效果是相当的,都能大大提高材料表面抗腐蚀性能和耐磨性能。     

A New Three-Dimensional Code for Simulation of Ion Beam Extraction： Ion Optics Simulator

A new thee-dimensional code, ion optics simulator （IOS）, to simulate ion beam extraction is developed in visual C＋＋ language. The theoretical model, the flowchart of code, and the results of calculation as an example are presented.     

放射性核束在生物医学中的应用

不同衰变方式和半衰期的放射性核束在生物医学领域有不同应用。本文评述了自20世纪70年代中期美国LBL实验室首次产生高能放射性核束以来，世界范围内利用放射性核束开展的生物医学应用研究情况，并提出了一些可在兰州放射性束流线（RIBLL）和将要建成的兰州重离子加速器冷却储存环（HIRFL－CSR）装置上进行的生物医学应用研究的设想。     

重离子束对牧草的改良

采用80MeV／u^20Ne^10 离子束贯穿处理豆科与禾本科牧草种子,大田和根尖细胞观测的结果表明,随着贯穿剂量的增加,幼苗生长明显减弱,呈负相关性。而染色体畸变率和微核率随剂量的增加而显著增加,呈正相关性。同时,从大田长势来看,禾本科牧草比豆科牧草对重离子辐射敏感性强,禾本科牧草适宜剂量为20-30Gy,豆科牧草为150Gy。