对改性晶圆上制备的PDSOI NMOS器件热载流子效应的全面认识

通过与常规器件的对比,本文详细研究了在硅离子注入改性晶圆上制备的PDSOI NMOS的热载流子诱导退化现象。理论分析和TCAD模拟结果表明,硅离子注入在埋氧层中引入的电子陷阱能够捕获注入的电子,并通过改变电场来影响氧化层的热载流子退化。在不同的应力条件下,其效果也有所不同。对改性器件施加热载流子应力时,改性器件的前栅和背栅之间存在着更明显的相互作用。同时,探讨了总剂量辐照对改性器件热载流子退化的影响。在改性器件中存在辐照增强的热载流子退化,高温退火只能部分消除这一影响。     

功率MOS器件单粒子栅穿效应的PSPICE模拟

建立了功率ＭＯＳ器件单粒子栅穿效应的等效电路模型和相应的模型参数提取方法,对ＶＤＭＯＳ器件的单粒子栅穿效应的机理进行了模拟和分析,模拟结果与文献中的实验数据相符合,表明所建立的器件模型和模拟方法是可靠的。     

MOS器件时间关联辐射响应的理论研究

利用响应函数对MOS器件时间关联辐射响应几个物理过程的实验数据进行拟合计算，包括空穴输运引起的短期恢复、深层俘获空穴引起的长期恢复以及界面态的长期建立。详细分析了俘获空穴的空间分布差异对退火响应的影响以及温度差异对界面态建立的影响。计算结果和实验测量值符合很好，表明该函数在响应分析中的应用是可行的。     

SOI器件瞬时剂量率效应的激光模拟技术研究

为验证激光模拟技术用于半导体SOI器件瞬时剂量率效应研究的可行性,对其优势和主要原理进行了分析。利用0.13 μm SOI MOS器件单管测试芯片进行了激光辐射实验,获得了不同尺寸器件辐射所激发的瞬时光电流与激光入射能量的关系曲线,并计算得到了线性拟合后的光电流表达式。通过激光实验数据与器件TCAD仿真结果的对比,获得了本文实验条件下的辐射剂量率 激光能量模拟等效关系。结果表明,激光模拟技术可用于半导体SOI器件瞬时剂量率效应研究。     

典型光电子器件辐射效应数值分析与试验模拟方法研究

选取Si太阳电池与线阵CCD器件，进行了光电器件辐射效应的数值分析与模拟试验方法研究。分析了光电器件电离效应和位移损伤机理，利用二维器件模拟软件MEDICI，模拟了1MeV电子对n／p型硅太阳电池主要输出参数的影响，包括开路电压Voe、短路电流Isc和最大输出功率Pmax.在一定范围内，计算结果与文献实验数据符合较好。建立了线阵CCD器件辐照效应离线测量系统。利用^60Coγ源，进行了商用器件的总剂量效应试验，给出了暗电流信号和饱和电压信号的变化曲线。     

功率MOS器件单粒子烧毁效应的PSPICE模拟

建立了功率MOS器件单粒子烧毁效应的等效电路模型和相应的参数提取方法,对功率MOS器件的输出特性和单粒子烧毁效应的机理进行了分析和PSPICE模拟,模拟结果与文献中提供的数据相符合,表明所建立的器件模型和模拟方法是可靠的。     

星用功率MOSFET器件单粒子烧毁试验研究

针对国产功率MOSFET器件JTMCS081和JTMCS062,利用实验室的MOSFET器件单粒子烧毁试验测试系统,在²⁵²Cf模拟系统上开展了单粒子烧毁评估试验研究。通过试验研究获得了被试器件单粒子烧毁的电压阈值,为被测器件在卫星型号的使用提供技术参考依据。     

计算机逻辑编程技术在谱仪触发判选系统中的应用

ＰＬＤ和ＦＰＧＡ是逐渐发展起来的可编程逻辑器件，可由用户用计算机编程实现需要的逻辑，本文简单介绍了器件的开发和在谱仪的触发判选系统中的应用。     

820型重离子源及其应用

随着重离子物理研究的开展及离子注入技术在材料科学方面的广泛应用,要求提供重离子和金属离子的品种日益增多。为此,在深入对Nielsen离子源研究的基础上,参照Danfysik 910型离子源研制成功了多功能、全离子化的820重离子源。由820重离子源获得的各种重离子束流已达30余种(表1),其中不少已在离子注入应用中得到可喜的结果。     

CT无线数据传输系统的研究与设计

研究了CT中无线数据传输系统的结构和控制方式,并对该系统进行了完整设计。在设计中采用了可编程逻辑器件控制高速数字无线收发元件nRF2401的方式。用VHDL语言编写了可编程逻辑器件的控制程序,实现了数据和指令的传输,同时对数据进行了纠错和辨识,并采用了多种措施提高系统的可靠性。实验证明,该系统传输数据快,准确率高,工作稳定可靠。     

Direct simulation,Monte Carlo,aerosol dynamics: Coagulation and condensation

In a post-accident reactor environment, condensation of different species on the aerosol particles can occur at a rapid rate which increases the mass and volume of the aerosol particles. This change in particle properties affects both the coagulation and deposition rates of the aerosols as well as removal of the condensates (for example, the fission products). We have explored the feasibility of the Direct Simulation Monte Carlo (DSMC) technique when condensation alone occurs, and when both condensation and coagulation occur simultaneously. We have simulated several test cases and compared the DSMC results against the analytical results. We have found that the DSMC results agree well with the analytical results for all the test cases simulated.     

Accurate location and marking of grain boundaries using focused ion and electron beams

We have investigated the 2×12° symmetric grain boundary of (0 0 1) oriented bicrystalline silicon substrates for high-T_c superconductor applications using scanning focused ion beam (FIB) and electron beam (SEM). We successfully used the focused ion beam to detect and to mark the grain boundary and hence, to increase the accuracy of positioning the Josephson device with respect to the grain boundary of the silicon substrate. Both imaging methods have been compared using channeling effects of focused ion and electron beams in a dual beam system.     

Operating System Requirements and User Interfaces

We have not attemped here to present the implementation or details of use of the facilities implemented in the Orsay packages. Rather, we have aimed to use these as examples of an approach to the presentation of a coherent and practical interface to the various types of user in bio-medicine.     

Construction and Operation of a Large Ring-Imaging Cerenkov Detector

We have constructed a large-aperture ring-imaging Cerenkov counter, intended to identify high momentum hadrons in a high pt experiment at Fermilab (E605). To date we have performed a preliminary analysis on a small subset of our data, taken during the initial operation of our counter (April-June 1982). We have obtained ?/K separation with good efficiency from about 60 GeV/c to 120 GeV/c in momentum under high luminosity conditions (~5 × 109 protons/second on target). Approximately 84% of all single-track events having at least one detected photon have been unambiguously identified. Cerenkov photons were detected by a multi-step avalanche chamber via the photoionization of triethylamine (TEA) vapor, and a mean number of 2.8 photons per event was detected for the highest velocity particles. Improvements in photon reconstruction are expected, especially as we refine our tracking procedures.     

塑料（PVC）流光管批量制造及质量影响因素的研究

本文描述了塑料流光管的批量制造工艺及影响性能质量的各种因素的研究结果,讨论了用Ar-CO_2作为自猝灭流光管工作气体的可能性问题。     

Depletion voltage and charge collection for highly irradiatedsilicon microstrip detectors with various initial resistivities

We have irradiated p-on-n silicon microstrip detectors of initial bulk resistivity between 0.2 and 2.7 kΩ-cm with 55 MeV protons to fluences of 0.7, 2 and 11×10¹³ p/cm² (equivalent to twice the fluence in high energy protons), and have measured the depletion voltage before and after irradiation using C-V methods. In addition, we have measured the charge collection of minimum ionization on a single strip with a fast amplifier as a function of bias voltage. We compare the depletion voltage deduced from both methods for samples with different initial resistivities     

L-Shell Ionization in Proton and Alpha Particle Collisions with Argon

We report results of coupled-state calculations of argon L-shell ionization by proton and alpha particle collisions in the 100 to 500 kev/amu energy range. Our target-centered basis includes up through f-states. We have explored the angular momentum convergence and ability of our pseudostates to describe the ionization continuum by comparing to the Born calculations of Choi; excellent agreement is obtained. In the Born we have shown the effect of using different independent-particle target potentials; these effects are large, particularly at low energy. We propose a modification of the Hartree-Fock potential that leaves all the wavefunctions and the bound orbital energies unaltered, but that lowers the continuum by an amount that brings the L-shell ionization potentials roughly into agreement with experiment. Our coupled-states calculations show deviations from the 1st Born approximation, and are in fair agreement with experiment. A complete comparison to experiment will require the calculation of the charge transfer channel contribution to the vacancy production.     

Electron emission in 10–100 keV H and He grazing ion-surface collisions

We have measured energy distributions of electrons ejected during grazing 10–100 keV H⁺ and He⁺ ions scattering from Si surfaces for a broad range of electron observation angles. The distributions have contributions strongly dependent on the directions of incidence and observation. For observation regions around the specular reflection of the ions we have studied the angular dependence of the electron structure resulting from electron transfer to the continuum of the effective ion potential. Far from the ion scattering plane we have observed the Si Auger electron spectrum. We discuss the differences between the Auger peaks obtained by electron and grazing proton bombardment of Si surfaces partially covered with O₂ and Al.     

Characteristics of fuel melting and relocation in metallic-fueled fast reactor core and its feasibility for eliminating recriticality

The paper gives a concept for eliminating recriticality so that a fast reactor core can have high potential to terminate severe accidents and prevent their progression into further disruption leading to a large-scale inter-subassembly molten configuration. The basic idea to eliminate recriticality events is to remove a certain amount of fuel materials out of the core in order to keep the core subcritical. This concept is called as Controlled Material Relocation (CMR). Based on the concept, we propose an example of CMR devising consisting of annular fuel pins for a metallic-fueled fast reactor core. By this devising, we can define the fraction of core fuels that should be preferentially removed out of the core to eliminate the recriticality potential. We have analyzed melting and relocation behavior of metallic fuel pin, which has annular fuel meat, under accidental condition leading to core degradation. We have also examined the possibility of eliminating neutronic recriticality for a metallic-fueled fast reactor, where the annular fuel pins are partially embedded in the core for realizing the CMR concept.     

Two and three dimension simulations of Smith-Purcell terahertz radiation using a particle-in-cell code

Although several 2-D simulations of Smith-Purcell (SP) radiation using particle-in-cell (PIC) codes have been performed, only recently have 3-D simulations been reported. To some extent this is caused by the requirements of computer memory and time, which are much greater in the latter. We present our new 3-D results concerning the simulation of the MIT experiment that used a pre-bunched 15 MeV beam to generate terahertz SP radiation. In particular, we compare the new results with our older 2-D simulations, in order to see which aspects survive in 3-D simulations. We also address the question of power radiated according to the two simulations.