BEPCⅡ正电子源磁通压缩装置的研制

正电子磁通压缩装置(Flux Concentrator，简称磁号)是正电子束流横向发射度的匹配装置，对提高正电子的俘获效率起非常关键的作用，是BEPCII正电子源的重要组成部分. 结合磁号的设计加工，用计算机软件模拟了磁号的磁场分布和共振特性，并同测量结果进行了比较.     

PDP用荧光粉的真空紫外辐照特性

利用“等离子体显示用荧光粉光学测试系统”中147nm真空紫外光,对实用的（Y,Gd）BO_3:Eu红粉,Zn_2SiO_4:Mn和（Ba,Sr,Mg）O·nAl_2O_3:Mn绿粉以及（Ba,Mg）O·nAl_2O_3:Eu~(2+)蓝粉进行较长时间的辐照,以观察荧光粉的衰减特性,发现红粉衰减最小,蓝粉初始衰减较快,而绿粉亮度存在一个先升后降的现象。     

热辐射研究综合实验平台的设计

设计了一个测量热辐射多个基本特性的综合实验平台,定量研究了辐射反平方定律、斯特藩-玻尔兹曼辐射定律、兰贝特余弦定律,且得到的数据与理论符合得较好,同时利用该平台还定性研究了基尔霍夫定律,揭示了物体的辐射能力与吸收能力的正相关性.该平台具有功能多、成本低、操作简便等优点,可引入大学物理实验教学中.     

Conceptual design of Hefei advanced light source

The conceptual of Hefei Advanced Light Source, which is an advanced VUV and Soft X-ray source, was developed at NSRL of USTC. According to the synchrotron radiation user requirements and the trends of SR source development, some accelerator-based schemes were considered and compared; furthermore storage ring with ultra low emittance was adopted as the baseline scheme of HALS. To achieve ultra low emittance, some focusing structures were studied and optimized in the lattice design. Compromising of emittance, onmomentum and off-momentum dynamic aperture and ring scale, five bend acromat (FBA) was employed. In the preliminary design of HALS, the emittance was reduced to sub nm·rad, thus the radiation up to water window has full lateral coherence. The brilliance of undulator radiation covering several eVs to keVs range is higher than that of HLS by several orders. The HALS should be one of the most advanced synchrotron radiation light sources in the world.     

Theoretical analysis of porous radiant burners under 2-D radiation field using discrete ordinates method

This paper describes a theoretical study to investigate the heat transfer characteristics of porous radiant burners (PRBs). In the present work, a 2-D rectangular model is used to solve the governing equations for porous medium and gas flow before the premixed flame to the exhaust gas. The gas and the solid phases are considered in non-local thermal equilibrium and combustion in the porous medium is modeled by considering a non-uniform heat generation zone. The homogeneous porous media, in addition to its convective heat exchange with the gas, may absorb, emit and scatter thermal radiation. The radiation effect in the gas flow is neglected but the conductive heat transfer is taken into account. In order to analyze the thermal characteristics of porous burners, the coupled energy equations for the gas and porous medium in steady condition are solved numerically and the discrete ordinates method (DOM) is used to obtain the distribution of radiative heat flux in the porous media. Finally, the effects of various parameters on the performance of porous radiant burners are examined. The present results are compared with some reported theoretical and experimental results by other investigators and good agreement is found.     

基于MATLAB的黑体辐射量计算

介绍了黑体辐射理论,利用MATLAB求解了普朗克黑体辐射公式在有界域λ1～λ2内的积分,通过实例对梯形法和辛普森法两种数值积分方法进行了分析和比较。并在此基础上对距黑体一定距离处探测器表面的辐照度值E进行了研究。通过分析可知,利用梯形法和辛普森法能够方便求出黑体在有界域内的辐出度值。此外,利用MATLAB编制的相应的计算界面,能够实现辐出度和辐照度的快速计算。     

DRESOR法对平行入射辐射问题的研究

本采用一种基于蒙特卡洛法(Monte Carlo Method,MCM)求解辐射传递方程(Radiative Transfer Equation, RTE)的快捷、有效的方法-DRESOR法(Distributions of Ratios of Energy Scattered Or Reflected)在一维充满吸收、各向同性散射介质平行平板中,外部有平行入射条件下,求解计算空间点的辐射强度沿空间方向角的分布,而不需要辐射平衡和在空间位置坐标和方向角度坐标上同时离散辐射传递方程进行迭代求解。     

ATPF–a dedicated proton therapy facility

A proton therapy facility based on a linac injector and a slow-cycling synchrotron is proposed. To obtain good treatments for different cancer types, both the spot scanning method and the double-scattering method are adopted in the facility, whereas the nozzles include both gantry and fixed beam types. The proton accelerator chain includes a synchrotron of 250 MeV in maximum energy, an injector of 7 MeV consisting of an RFQ and a DTL linac, with a repetition rate of 0.5 Hz. The slow extraction using the third-order resonance and together with the RFKO method is considered to be a good method to obtain a stable and more-or-less homogenous beam spill. To benefit the spot scanning method, the extraction energy can be as many as about 200 between 60 MeV and 230 MeV. A new method – the emittance balancing technique of using a solenoid or a quadrupole rotator is proposed to solve the problem of unequal emittance in the two transverse planes with a beam slowly extracted from a synchrotron. The facility has been designed to keep the potential to be upgraded to include the carbon therapy in the future.     

一种新型光纤高温计的研制

 基于国产GDB159/142光电倍增管（PMT）,采用光纤传输并结合二向色分光原理研制了高速光学高温计系统,测量波长覆盖340～811 nm,响应时间2～3 ns,可测量2 500～15 000 K的冲击温度。脉冲线性检测结果表明,6个通道的动态线性均大于200 mV（50 Ω负载）。给出了溴钨灯光谱辐照度标定方法和动态应用实例。     

Relevancy of phase separation between electrical and thermal properties in La0.8Sr0.2MnO3 thin films

For the purpose of finding the relevancy of phase separation between electrical and thermal properties, La_0.8Sr_0.2MnO₃ thin films, deposited on quartz glass substrates, were studied for temperature dependent resistance and thermal emittance. Based on the phase separation concept, metal phase volume fraction f was calculated from the temperature dependence of resistance and emittance properties by a phenomenological model and two-energy-level Boltzmann distribution, respectively. The two sets of f coincide with each other very well. The results show f plays an important role in the electrical transportation and thermal properties, and the two properties are essentially correlated by f.