共查询到19条相似文献,搜索用时 343 毫秒
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介绍了计算伏秒消耗的玻印亭方法,并通过扫描等离子体电流爬升率对伏秒消耗进行了优化分析。分析结果对EAST装置长脉冲稳态放电提供一定的参考。 相似文献
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HL-2A极向场线圈系统的优化设计 总被引:2,自引:2,他引:0
通过对原ASDEX极向场线圈系统进行改造,优化设计出HL-2A极向场线圈系统,模拟计算了磁场位形演化并估算了伏秒消耗。改造后的极向场线圈系统能够形成800kA的等离子体电流,并能产生拉长截面的等离子体偏滤器的位形。分析了改造后的极向场线圈系统的电磁特征,计算了单零,双零及D形限制器三种等离子体平衡位形。 相似文献
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介绍了通过反向叠加长脉冲的方法,在双脉冲间隔小于1 μs的情况下对直线感应加速器磁芯进行的脉冲间复位实验,复位后波形幅度得到了明显改善,在最大伏秒值280 kV×100 ns的单脉冲感应腔上得到了两个伏秒值为200 kV×100 ns的感应脉冲。实验表明:当主脉冲脉宽小于100 ns,间隔大于500 ns时,采用脉冲间叠加复位的方法,将主脉冲叠加在一个反向的长脉冲上(脉宽大于10 μs,最大幅度约为主脉冲的20%)形成正负脉冲串,能有效提高感应加速腔磁芯的利用率,且对感应主脉冲没有明显影响,使单脉冲直线感应加速器的多脉冲改造成为可能。 相似文献
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利用11/2-D平衡演化程序对EAST的首轮纯欧姆放电进行了数值模拟,获得的模拟结果与实验结果吻合得很好。同时,对放电全过程中的伏秒消耗进行了分析。 相似文献
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激光器型全光波长转换器的小信号分析 总被引:2,自引:1,他引:1
当外部光子注入到激光器有源腔中时 ,载流子把被注入光子消耗的一部分放大 ,进而激光器自身的输出功率将降低。基于此 ,可以实现全光波长转换。理论上基于载流子消耗机制 ,对激光器型波长转换器进行了小信号分析 ,给出了频率响应函数。理论分析表明 ,激光器型全光波长转换器的转换速度取决于激光器光子寿命以及激光器腔内的光子密度。 相似文献
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双孔径校正超导磁体是大型强子对撞机亮度升级项目的重要组成部分,在4.2 K低温环境下对该磁体进行励磁及性能测试。为避免磁体在降温过程中产生较大的热应力,要求降温过程中磁体各点最大温差不超过30 K。同时,为节省液氦与降温梯度均匀,特设计了一个铜筒体结构用于该磁体的降温和测试,降温过程分为液氮换热降温和液氦直冷降温两个阶段。实验测试结果表明静态液氦消耗速率为55.571 L/h,电流为407 A失超时液氦总消耗52 L、静态消耗16.116 L、内部泄能消耗22.08 L,即液氦消耗不仅包括测试系统的静态消耗、泄能消耗,还存在液氦溢出损耗。 相似文献
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Dan Liu Eugène Vorobiev Raphaëlle Savoire Jean-Louis Lanoisellé 《Ultrasonics sonochemistry》2013,20(2):708-714
Ultrasound (US) was used to facilitate dead-end microfiltration (MF) of grape pomace (GP) extracts. The effects of ultrasonic power, sonication cycle time and ultrasonic probe height on filtration behaviour were investigated. Ultrasonic irradiation had a strong impact on the MF processes, especially with high output power and continuous mode.A comparative study of US-assisted and stirred MF was performed. The energy consumption and liquid flux enhancement of the two filtration systems were compared. Under the same dissipation power, the flux enhancement is much higher for the US-assisted MF. A correlation equation for predicting permeate flux was derived from resistance-in-series model. The flux predictions were confirmed with the experimental results. Finally, the characteristics of permeate after US-assisted and stirred filtration were evaluated. 相似文献
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A novel lattice model integrating the cooperative deviation of density and optimal flux under V2X environment 下载免费PDF全文
Guang-Han Peng 《中国物理 B》2023,32(1):18902-018902
A novel lattice hydrodynamic model is proposed by integrating the cooperative deviation of density and optimal flux under vehicle to X (V2X) environment. According to the theoretical analysis, the stability conditions and the mKdV equations affected by the cooperative deviation of traffic information are explored. And the density wave, hysteresis loop and energy consumption of the traffic flow have been investigated via numerical simulation. The results indicate that the cooperative deviation of density and optimal flux can effectively alleviate the traffic congestion. More importantly, our new consideration can reduce fuel consumption and exhaust emission under the V2X environment. 相似文献
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C. Bauer H. Raich G. Jeschke P. Blümler 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2009,198(2):222-227
A magnetic system is introduced which consists of three nested rings of permanent magnets of a Halbach dipolar layout and is capable for EPR spectroscopy. Two of the rings can be rotated independently to adjust the magnetic flux in the center and even allow for mechanical field sweeps. The presented prototype achieves a magnetic flux range of 0.0282–0.3013 T with a minimal sweep of 0.15 mT and homogeneity of about 10−3.First applications with CW and pulsed Mims ENDOR as well as ESEEM experiments on a sample of a glycine single crystal doped with 1% copper nitrate demonstrate that flux range, sweep accuracy and homogeneity of this prototype is sufficient for EPR experiments on most solid samples.Together with a recently improved design magnets can be build which could serve as compact and easily transportable replacement of standard electromagnets with negligible consumption of power or coolants. 相似文献
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S.L. Olson H.D. Beeson J.P. Haas J.S. Baas 《Proceedings of the Combustion Institute》2005,30(2):2335-2343
The standard oxygen consumption (cone) calorimeter (described in ASTM E 1354 and NASA STD 6001 Test 2) is modified to provide a bench-scale test environment that simulates the low velocity buoyant or ventilation flow generated by or around a burning surface in a spacecraft or extraterrestrial gravity level. The equivalent low stretch apparatus (ELSA) uses an inverted cone geometry with the sample burning in a ceiling fire (stagnation flow) configuration. For a fixed radiant flux, ignition delay times for characterization material PMMA are shown to decrease by a factor of 3 at low stretch, demonstrating that ignition delay times determined from normal cone tests significantly underestimate the risk in microgravity. The critical heat flux for ignition is found to be lowered at low stretch as the convective cooling is reduced. At the limit of no stretch, any heat flux that exceeds the surface radiative loss at the surface ignition temperature is sufficient for ignition. Regression rates for PMMA increase with heat flux and stretch rate, but regression rates are much more sensitive to heat flux at the low stretch rates, where a modest increase in heat flux of 25 kW/m2 increases the burning rates by an order of magnitude. The global equivalence ratio of these flames is very fuel rich, and the quantity of CO produced in this configuration is significantly higher than standard cone tests. These results demonstrate that the ELSA apparatus allows us to conduct normal gravity experiments that accurately and quantifiably evaluate a material’s flammability characteristics in the real-use environment of spacecraft or extraterrestrial gravitational acceleration. These results also demonstrate that current NASA STD 6001 Test 2 (standard cone) is not conservative since it evaluates a material’s flammability with a much higher inherent buoyant convective flow. 相似文献
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Thomas Ortlepp Olaf Mielke Juergen Kunert Hannes Toepfer 《Physica C: Superconductivity and its Applications》2010,470(21):1955-1958
We implemented small superconducting loops containing a frozen single flux quantum in single flux quantum (SFQ) electronics. Such an element acts as a π-phaseshifter which is the missing complementary circuit element in SFQ electronics and can significantly improve the circuit reliability and robustness. We designed a four bit ripple counter including toggle flip-flops (TFF) with these π-phaseshifters. We analyzed the circuit stability by means of bit error rate (BER) measurements versus bias supply. The measured operation range of the counter in standard SFQ technique was ±14% and could be improved to ±24% for the new version utilizing π-phaseshifters. These results are a clear proof for a more robust circuit realization achieved without any additional power consumption. Furthermore, it supports the reduction of present power consumption in SFQ circuits by using smaller switching energy as well as the development of more complex circuits because of a reduced sensitivity against technological parameter spread. 相似文献