共查询到20条相似文献,搜索用时 140 毫秒
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利用金属气化真空弧离子源(以下简称Mevva)形成金属等离子体,然后从中引出离子束是一种很有效的产生大束流金属离子束的技术。周期表上几乎所有的固体金属都可通过这种技术产生几安培的金属离子脉冲束流。最近进行的一些试验还证实利用这种技术还可获得金属离子的直流束流。它所采用的离子束引出电压可以高达100keV。由于真空弧等离子体产生的离子一般都带有多电荷,因此,离子能量实际上可高达几百keV。这种离子源可用于重离子同步加速器的注入装置、金属离子注入以及其它应用领域。美国的Berkeley大学和世界上其它国家的科研机构分别研制出了好几种结构不同的这种类型的离子源。它们具有下述特点:阴极数目多、能够很方便地迅速更换18种阴极材料,束的直径可以大到50cm,也可以小到姆指那么大,本文将根据Berkeley大学所承担的Mevva离子源研制规划的发展前景,对这种离子源的设计特点、使用性能和束的特性等作一综述性的介绍。 相似文献
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一、引言 离子源是离子注入机的关键部件。注入机如能配备一个较理想的离子源,就可以得到品质较好,数值较大的束流以及不同种类的离子。 由于冷阴极潘宁离子源具有功耗小、寿命长、结构紧凑、体积小、电源简单、束流调节方便等特点。所以被广泛应用在离子注入机上。尤其作为半导体器件注入工艺用的离子注入机大多采用冷阴极潘宁离子源。 相似文献
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针对高电位控制执行电路运行的强磁场环境,改善系统控制受磁场﹑弧光放电干扰,提高加速器控制系统运行的稳定性。通过对电子束流控制电路及其运行环境的解析,就系统中的频率转换、短路保护电路改进设计。改造后的束流控制系统从试验、调试数据显示,均达到设备设计标准,在运行中达到1.5MeV,并且在1.2MeV出束,经过对系统电路干扰运行的测试分析及运行结果表明,提高了系统控制的稳定性和抗干扰能力。 相似文献
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Carlsten B.E. Young L.M. Jones M.E. Thode L.E. Lumpkin A.H. Feldman D.W. Feldman R.B. Blind B. Browman M.J. O'Shea P.G. 《Quantum Electronics, IEEE Journal of》1991,27(12):2580-2597
The authors review the accelerator design of the high brightness accelerator free electron laser (FEL) (HIBAF) at Los Alamos National laboratory and analyze its performance. HIBAF is the first high-brightness high-current (several hundred amperes) accelerator build using a photoelectric injector. The authors discuss the design philosophy and the integrated numerical experiment (INEX) design tool, and describe the accelerator components. Currently, the machine has only been operated at intermediate energies near 15 MeV. The INEX computer code package is used to examine the accelerator performance by comparing the measurements with simulations at that energy. The accelerator should be able to reach the design goal of 300 A current with the normalized 90% transverse emittance of less than 50 π mm mrad for a 5-nC bunch after reaching the final energy of 40 MeV 相似文献
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太赫兹波的产生途径有很多,本文通过理论设计和数值计算模拟了利用强流直线感应加速器神龙一号来产生 THz波。神龙一号直线感应加速器能够产生最大能量~20 MeV、束流强度~2 kA、脉冲宽度~60 ns 的脉冲电子束,脉冲电子束以不同能量通过偏转半径不相同的偏转磁铁后可以辐射出具有连续频率的太赫兹波。模拟计算了不同能量下的电子束通过偏转半径分别为0.2 m、0.5 m和1 m的偏转磁铁后得到的太赫兹波频率与电子束能量、磁铁偏转半径等的关系,太赫兹波的频率范围可达0.1 THz~9 THz,最大瞬时辐射功率~0.5 W。最后根据神龙一号直线感应加速器漂移段布局,设计得到偏转半径为0.5 m的偏转磁铁结构以及模拟结果。 相似文献
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现代大型实验物理和加速器装置中,高精度设备的使用越来越广泛。由于一些高精度设备对工作环境温度要求非常苛刻,在这种情况下,对环境温度的监测就显得十分必要。EPICS(ExperimentalPhysics and Industrial Control System)是应用于大型实验物理和加速器控制系统组态软件工具集,已在多个加速器上得到应用。该文介绍了一种基于EPICS的温度监测报警系统的实现,并在BEPCII电子枪定时插件温度监测中得到应用。 相似文献
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P. Padmini F. Tompkins S. Shojah-Ardalan P. Kale R. Wilkins R. K. Pandey 《Journal of Electronic Materials》2005,34(8):1095-1098
Ilmenite-hematite (IH) [(1−x)FeTiO3·xFe2O3] solid solutions are unique classes of materials showing both magnetic and semiconducting properties, which make them potential
candidates for novel applications in microelectronics and spintronics. This paper focuses on their varistor behavior before
and after exposure to 40 MeV and 10 MeV proton radiations up to a fluence of 5×1010 p/cm2. The IH films are tolerant to these irradiations with little significant change to the nonlinear current-voltage characteristics.
The switching voltage of the devices is in the regime of practical applications, and the radiation tolerance makes these materials
suitable for aerospace applications. 相似文献
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悬挂式电子油门踏板功能试验台研制 总被引:3,自引:0,他引:3
传统的油门控制方式应用范畴疏导限制并缺乏精确性,已经不能满足各种功能测试的要求,针对悬挂式电子油门踏板功能试验要求,设计了悬挂式电子油门踏板功能试验台的系统结构和测控系统,具有创新意义。分别运用Labview和Delphi开发测控系统和分析系统,各路传感器信号高速并行采集。最后给出悬挂式电子油门踏板的试验结果并对结果进行分析,试验结果表明系统性能稳定、重复精度高,并具有广泛的应用前景。 相似文献
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Yong Cheol Peter Cho Jaehoon Chung Jeongmin Yang Chun‐Gi Lyuh HyunMi Kim Chan Kim Je‐seok Ham Minseok Choi Kyoungseon Shin Jinho Han Youngsu Kwon 《ETRI Journal》2020,42(4):491-504
We present AB9, a neural processor for inference acceleration. AB9 consists of a systolic tensor core (STC) neural network accelerator designed to accelerate artificial intelligence applications by exploiting the data reuse and parallelism characteristics inherent in neural networks while providing fast access to large on‐chip memory. Complementing the hardware is an intuitive and user‐friendly development environment that includes a simulator and an implementation flow that provides a high degree of programmability with a short development time. Along with a 40‐TFLOP STC that includes 32k arithmetic units and over 36 MB of on‐chip SRAM, our baseline implementation of AB9 consists of a 1‐GHz quad‐core setup with other various industry‐standard peripheral intellectual properties. The acceleration performance and power efficiency were evaluated using YOLOv2, and the results show that AB9 has superior performance and power efficiency to that of a general‐purpose graphics processing unit implementation. AB9 has been taped out in the TSMC 28‐nm process with a chip size of 17 × 23 mm2. Delivery is expected later this year. 相似文献
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