Integrated data analysis on the electron temperature profile of HL-2A with the Bayesian probability inference method

Data analysis on tokamak plasmas is mainly based on various diagnostic systems, which are usually modularized and independent of each other. This leads to a large amount of data not being fully and effectively exploited so that it is not conducive to revealing the deep physical mechanism. In this work, Bayesian probability inference with machine learning methods have been applied to the electron cyclotron emission and Thomson scattering diagnostic systems on HL-2A/2M, and the effects of integrated data analysis (IDA) on the electron temperature of HL-2A with Bayesian probability inference are demonstrated. A program is developed to infer the whole electron temperature profile with a confidence interval, and the program can be applied in online analysis. The IDA results show that the full profile of the electron temperature can be obtained and the diagnostic information is more comprehensive and abundant with IDA. The inference models for electron temperature analysis are established and the developed programs will serve as an experimental data analysis tool for HL-2A/2M in the near future.     

基于虚拟仪器的液态调配器控制系统

基于虚拟仪器技术设计了HT-7托卡马克离子回旋共振加热液态调配器控制系统。系统硬件由PC机、液压传感器、数据采集卡,模拟输出卡、接口电路和油泵、电动球阀组成的油路系统等组成。系统界面采用虚拟仪器开发软件LabVIEW设计。系统根据测量得到的液态调配器各支节当前硅油液位高度,和匹配高度相比较,采用自动或手动控制的方法,对各支节中的硅油液位进行控制,从而达到离子回旋共振加热系统阻抗匹配的目的。     

用飞行时间法测定回旋加速器束流能量

我所改建后的等时性回旋加速器,质子能量从10—30MeV连续可变。如何测定这些束流的能量,方法很多,如弹性、非弹性散射,核反应等。本工作用飞行时间法测定了该所等时性回旋加速器的束流能量。其优点是方法简单、可靠,测量结果准确度较高,在较宽的能量范围内都可以适用。     

利用小型回旋加速器研制核微孔滤膜

本文介绍用小型回旋加速器研制核微孔滤膜的方法。     

低温技术在受控核聚变实验中的应用

在中国环流器一号（ＨＬ－１）等离子体物理实验中，增加了弹丸注入和电子回旋共振加热系统。对低温技术在其中的应用情况，液氦输送系统，输液方法及氦气回收系统做了介绍。在一次等离子体物理实验中，总共使用液氦２７３３Ｌ。在弹丸注入系统中，使装置的等离子体密度提高了１～２倍。在装置上成功地实现了电子回旋共振加热，使等离子体电子温度增加３０％以上。     

Operation of a compact electron cyclotron resonance source for the growth of gallium nitride by molecular beam epitaxy (ECR-MBE)

The operation of an ASTeX compact electron cyclotron resonance plasma source and its effect on the growth of GaN thin films by electron cyclotron resonancemolecular beam epitaxy has been investigated. The role a flow limiting orifice plays in increasing plasma stability as well as reducing ion damage and impurities in resultant films has also been studied. Both optical emission spectroscopy as well as electrostatic (Langmuir) probe studies have been employed to elucidate the generation and transport of charged and neutral species. With the introduction of the flow orifice, a substantial decrease in ion induced damage as well as surface roughening in the films is observed. This can be accounted for in terms of a collisionally induced relaxation of the grad-B acceleration of charged species toward the substrate in plasma sources employing axial solenoidal fields.     

~(119)Sb穆斯堡尔源制备

一、引言离子注入穆斯堡尔谱学是新近发展起来的研究离子掺杂时引起的晶格微观结构变化的重要手段。用同位素分离器进行放射性离子注入是离子注入穆斯堡尔诺学中最为行之有效的方法,因为它的注入剂量与通常离子注入相比可大大降低。问题是希望能找到满足研究     

High ion density dry etching of compound semiconductors

The use of plasma sources that generate high ion densities (> 10¹¹ cm⁻³) enables dry etching of compound semiconductors at high rates with anisotropic sidewalls. In this paper we review the use of several types of electron cyclotron resonance (ECR) plasma sources and contrast the result with those obtained under reactive ion etching conditions. Various problems occurring in dry etching will be discussed, including aspect ratio dependent etch rates, mask erosion, sidewall roughening and damage introduction into the semiconductor. This damage may consist of point and line defect creation, non-stoichiometric surfaces, resputtering of mask materials or deposition of contaminating films. The use of low or high substrate temperatures to control the desorption kinetics of etch products is also discussed; at low temperatures problems can occur with condensation of the etch gases onto the substrate, while at elevated temperatures it is necessary to thermally bond the sample to the r.f. powered electrode to obtain reproducibility. Etch selectivity between the components of heterostructure systems such as GaAs/AlGaAs, GaAs/InGaP, InGaAs/AlInAs and GaN/AlN is usually much worse under high ion density conditions because of the high rates and large physical component.     

STUDY OF GYROMONOTRON WITH A COMBINING PERIODIC MAGNETIC FIELD AND A COAXIAL CYCLOTRON ELECTRON BEAM

On the basis of a work of Wu Jianqiang et al.(1987),by making use of the linear kinetictheory,the gyromonotron with a combining periodic magnetic field and a coaxial cyclotron electron beam hasbeen analysed in detail.And the formulas of the electron beam to wave interaction power,frequency shift andstarting current,etc.have been derived.     

傅立叶变换离子回旋共振质谱及其在药学领域的应用

傅立叶变换离子回旋共振质谱可以实现超高分辨率和质量精确度,在药物结构鉴定和元素分析中展现出强大的优势,并发展成为分析复杂混合物的强有力工具。本文简述了傅立叶变换离子回旋共振质谱的分析特性以及在药学领域的应用。