Optimization of Cavity Combination for 20 MA LTD-Based Accelerators

Based on a transmission line code,a circuit model is proposed that could serve as the basic method for the analysis of linear transformer driver (LTD)-based accelerators.By using 1MA,100kV LTD cavities,the peak load current is optimized for a total of N cavities between 500 and 1200.The simulation results suggest that,with the same number of cavities,the peak current changes obviously with the types of combinations,and the maximum change can be as large as 1.2MA.The results also show that,for the cases considered,the optimized peak current as a function of the total number of cavities agrees with the exponential associate,and the peak current for one level LTD cannot be enhanced infinitely.Furthermore,it is found that,to obtain a 20MA peak load current,at least 1029 LTD cavities (49 in series and 21 in parallel connection) are needed.Finally,the typical parameters of the optimized design are compared to those of the existing Z accelerator.     

改良的DHX工艺在丙烷回收装置中的应用

为回收油气田中的丙烷,以现有专利DHX工艺为基准,提出两种丙烷回收改进工艺,并运用HYSYS对3种工艺进行了模拟和分析。结果表明:3种工艺均能满足丙烷回收率大于98%和脱乙烷塔塔底乙烷/丙烷比值小于等于1.6%的指标要求。专利DHX工艺复杂,采用丙烷冷冻系统,设备投资成本高。改良的DHX工艺Ⅰ和Ⅱ取消了丙烷制冷系统,简化了流程并且降低了设备投资。相对于改良方案Ⅰ,改良的DHX工艺Ⅱ干气出口压缩机的能耗增大47%;即从能耗及操作性角度而言,改良的DHX工艺Ⅰ既优于专利DHX工艺也优于改良的DHX工艺Ⅱ,建议丙烷回收装置采用改良的DHX工艺Ⅰ,可使丙烷高产出又经济低能耗。     

DG4型0.08mm薄带硅钢磁芯的脉冲磁化特性

本文对高功率直线脉冲变压器常用的一种0.08mm薄带DG4型硅钢片绕制的环形磁芯的脉冲磁化特性进行了实验研究。结果表明，在周期为百微抄量级欠阻尼振荡激磁电流作用下，磁芯磁滞回线基本上与工频电流激磁时相同，而周期在微秒量级欠阻尼振荡激磁电流作用下，磁芯在激磁电流第一个脉冲磁化达到饮和后，当激磁电流反向时，磁芯不能随之反向磁化，而是一直处于饱和状态，失去磁性。     

Ultra Fast Shutter Driven by Pulsed High Current

Radiation simulation utilizing plasma radiation sources (PRS) generates a large number of undesirable debris, which may damage the expensive diagnosing detectors. An ultra fast shutter (UFS) driven by pulsed high current can erect a physical barrier to the slowly moving debris after allowing the passage of X-ray photons. The UFS consists of a pair of thin metal foils twisting the parallel axes in a Nylon cassette, compressed with an outer magnetic field, generated from a fast capacitor bank, discharging into a single turn loop. A typical capacitor bank is of 7.5 μF charging voltages varying from 30 kV to 45 kV, with corresponding currents of approximately 90kA to140 kA and discharging current periods of approximately 13.1 μs. A shutter closing time as fast as 38 microseconds has been obtained with an aluminium foil thickness of 100 micrometers and a cross-sectional area of 15 mm by 20 mm. The design, construction and the expressions of the valve-closing time of the UFS are presented along with the measured results of valve-closing velocities.     

危化品生产装置区模拟泄漏训练塔应用

危化品生产装置区模拟泄漏训练塔对于提升基层消防人员训练水平,熟练掌握消防器材装备的应用技能,提高自身作战能力具有重要作用。针对经常遇到的危化品泄漏情况,模拟泄漏训练塔的设计突出了真实展现灾害现场的各种场景,其结构合理、功能齐全、安全可靠,确为消防战斗员正确使用消防堵漏器材和消防指挥员临场决策提供可靠的技战术训练保障。     

多间隙气体开关放电通道图像的实验研究

利用 45°锥体不锈钢反射镜和分幅式变象管高速相机 ,研究了环状不锈钢和弹簧两种间隙电极结构的气体开关在不同气压下自击穿和触发击穿时的放电通道。实验表明 :两种间隙电极结构开关触发击穿放电通道数比自击穿多 ;同等实验条件下 ,环状不锈钢间隙电极开关放电稳定性比环状弹簧间隙电极开关好 ,弹簧电极的均匀性和支撑需要进一步完善。     

高功率Z-Pinch脉冲源技术的发展

概述了脉冲功率系统中的电容储能、电感储能和磁感应储能技术。基于直线型脉冲变压器（LTD）、电感储能（LES）、等离子体断路开关（POS）以及真空磁绝缘传输线（MITL）技术的低电感、模块化脉冲源将来可能作为基本的子模块应用于超大型高功率Z－Pinch装置。     

Influence of Cathode Materials on Opening Performance of Plasma Opening Switch

1.IntroductionTheplasmaopeningswitchhasbeenusedforpulsecompressionandpoweramplificationinavarietyofinductiveenergystoragesystemswithconduc-tiontimerangingfromtensofnanosecondstomorethanonemicrosecond.Significantprogresshasbeenachievedduringthelastdecadeintheunderstandingoftheoperationofaplasmaopeningswitch[l~7].Theinfluenceofelectrodesontheswitchperfor-mancehasbeeninvestigatedbyseveralresearcherswithmodifyingthecathodeshape,changingthean-odematerialordiameter,andcleaningtheelectrodesuslnggasdi…     

Simulation Analysis of Transmission-Line Impedance Transformers for Petawatt-Class Pulsed Power Accelerators

Based on the transmission line code TLCODE, a 1D circuit model for a transmission- line impedance transformer was developed and the simulation results were comp...     

电泳沉积法制备PNN-PZT厚膜的研究

利用电泳沉积法在φ50 μm的铂金丝上制备了厚度约50 μm的0.2Pb(Ni_1/3Nb_2/3)O₃-(0.8-x)PbTiO₃-xPbZrO₃ (PNN-PZT)致密压电陶瓷厚膜. 研究了不同聚合度的分散剂聚乙二醇(PEG)对悬浮液的Zeta电势和厚膜表面形貌的影响.结果显示, 加入高聚合度的分散剂PEG10000所制得的悬浮液比加入低聚合度的分散剂PEG6000制得的悬浮液更稳定, 并且电泳沉积得到的厚膜也更加致密. 本研究解释了不同聚合度的PEG对悬浮液稳定的可能原因, 并比较了连续电泳沉积法与分步电泳沉积法对厚膜表面形貌的影响, 结果表明采用分步电泳沉积法制备的厚膜更加致密. 研究了不同的烧结温度对PNN-PZT厚膜形貌和介电性能的影响, 结果显示烧结温度为1180℃时, 厚膜的介电性能最好, 介电常数达988, 介电损耗为3.7%. 测试了1180℃烧结的PNN-PZT厚膜的电压位移曲线和电滞回线, 结果表明厚膜的有效压电常数为90 pm/V,剩余极化为6.00 kV/cm.