表面放电AC—PDP放电特性的数值模拟

给出一种数值模拟的方法,来研究表明放电型AC－PDP的放电单元结构参数对着火电压的影响。通过这种方法,研究了放电单元结构参数,如放电间隙宽度、电极宽度、障壁高度、绝缘介质层厚度、介质层的介电常数以及寻直电极偏压等对着火电压的影响。所得结果有助于优化表面放电AC－PDP放电单元的结构设计。     

非均匀扇形磁场三阶象差系数计算机辅助推导

利用计算机推导出非均匀扇形磁场所有三阶象差系数具体解析表达式，所用软件包是用人工智能语言ＡｒｉｔｙＰｒｏｌｏｇ编制。所得结果可直接应用于高性能扇形磁场分析器和偏转器的工程设计和计算。     

沉积角度对MgO介质保护膜性能的影响

由于介质保护膜的特性极大地影响交流等离子体显示器(AC-PDP)的寿命、功耗和显示质量,所以研究介质保护膜的制备工艺是十分重要的。本文利用电子束加热蒸镀法,在不同沉积角度下制备了MgO介质保护膜和宏单元气体放电屏。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对制备的介质保护膜样品的微观结构和表面特征进行了表征,并且,利用宏单元气体放电实验屏研究了介质保护膜的气体放电特性。结果表明:在沉积角度为15°下制备的MgO介质保护膜,薄膜的着火电压最低,晶粒最大,并且结晶取向最强。     

Sc2O3掺杂及其工艺参数对MgO介质保护膜性能的影响

MgO介质保护膜掺杂可以改变其性能，基于这一现象，本文利用电子束加热蒸镀法，在多种掺杂比和多种工艺条件下制备了MgO介质保护膜和宏单元气体放电屏。利用扫描电子显微镜（SEM）对制备的复合介质保护膜样品的进行了微观表征，并且，利用宏单元气体放电实验屏研究了介质保护膜的气体放电特性。结果表明：与纯Mg0介质保护膜相比，掺杂Sc2O3的介质保护膜具有较好的性能。     

A New Method for Measuring the Wall Charge Waveforms of AC PDP

A new method is developed to measure the wall charge waveforms in coplanar alternating current plasma display panel (AC PDP). In the method, two groups of display electrodes are selected from a coplanar AC PDP and two capacitors are respectively connected with thesetwo groups of display electrodes in series, and a measuring circuit and a reference circuit are thus constructed. With the help of special processing, discharge takes place in the cells included in the measuring circuit under a normal drive voltage but no discharge takes place in the cells included in the reference circuit under a normal drive voltage. The wall charge waveforms are obtained from the voltage difference between the two capacitors. Using the method, the wall charge waveforms are measured during resetting period, addressing period and sustaining period for the 304.8 mm (12-inch) test PDP panel. The result shows that the wall voltage is about 96 V during the sustaining period.     

A Volume-Weighting Cloud-in-Cell Model for Particle Simulation of Axially Symmetric Plasmas

A volume-weighting cloud-in-cell (VW-CIC) model is developed to implement the particle-in-cell (PIC) simulation in axially symmetric systems. This model gives a first-order accuracy in the cylindrical system, and it is incorporated into a PIC code. A planar diode with a finite-radius circular emitter is simulated with the code. The simulation results show that the VW-CIC model has a better accuracy and a lower noise than the conventional area-weighting cloud-in-cell (AW-CIC) model, especially on those points near the axis. The two-dimensional (2-D) spaze-charge-limited current density obtained from VW-CIC model is in better agreement with Lau‘s analytical result. This model is more suitable for 2.5-D PIC simulation of axially symmetric plasmas.     

增强AC PDP低灰度级图像的子场抖动方法

为增强交流等离子体显示器(AC PDP)中低灰度级图像的显示效果,提出了一种子场抖动方法。该方法根据ACPDP采用子场方法显示灰度的特点,利用一种新型阈值矩阵对AC PDP中权重较小的两个子场分别进行抖动处理。同时,设计实现了子场抖动电路,并将其与传统误差扩散电路分别应用于32英寸AC PDP上进行测试。实验结果表明,子场抖动方法在表达低灰度级图像时无条纹状噪声,对低灰度级图像的增强效果优于传统误差扩散方法。     

AC-PDP新型驱动电路的设计与实现

针对现有AC-PDP驱动电路产生波形不够灵活的缺点,基于隔离变压器耦合的思想,采用模块化、层次式的设计方法,设计并实现了一种新型的驱动电路.经理论分析、计算机模拟和实际测试,此电路能够实现控制信号的传递,产生正确的输出,并能够产生宽脉冲、窄脉冲、斜坡脉冲、钡脉冲等信号.     

强流离子束的最佳聚焦

在同时考虑束流发射度和空间电荷效应情况下,推导出了轴对称强流离子束的最佳聚焦条件,并根据数值计算结果,绘制出了最佳聚焦条件下确定束腰半径、束腰位置和固定靶上最小束半径的通用关系曲线。     

加速器非线性动力系统方程任意阶近似解析解

用严格的分析方法获得了普遍的非线性动力系统方程的任意阶近似解析解,从而解决了加速器动力学和带电粒子光学中长期未能解决的任意阶象差系数解析解的难题。