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基于实时Linux的极向场电源主控制系统的设计 总被引:1,自引:0,他引:1
��ʫӢ������������ ���� ��������� 《核聚变与等离子体物理》2018,38(1):93-98
为了满足极向场电源控制系统严苛的实时响应的要求,选择实时Linux系统作为系统平台,采用一个开放源代码的、基于C/C++的Eclipse可扩展的开发平台作为开发工具,完成极向场电源主控制系统的设计,实现了在一个控制周期内(1ms)对极向场电源系统的12套本地控制器的实时通信和实时控制。对极向场电源主控制系统的高速通信和实时控制、稳定可靠等关键问题给出了可行的实践性的解决方法。经实验测试,该设计运行稳定,能满足极向场电源控制系统的实时需求。 相似文献
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Tunable all-optical bistability in a semiconductor quantum dot damped by a phase-dependent reservoir
We propose a method of frequency and phase control of optical bistability in a unidirectional ring cavity containing a semiconductor structure which is characterized as a ladder three-level system. The system interacts with a coherent probe field, and a control field which consists of a strong coherent field and a weak amplitude-fluctuating stochastic field. A perturbative solution of the master equation of the system allows to eliminate the stochastic field and provides a physical picture in terms of correlation properties of the stochastic field. We find that the bistable response can be modified strongly by means of the amplitude, the frequency and the phase of the stochastic field. In order to illustrate the feasibility of the results, we use parameter values corresponding to an semiconductor quantum dot (QD). This investigation may be used to optimize and control the optical switching process in the QD solid-state system, which is much more practical than that in atomic systems. 相似文献
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According to the high real-time and high-reliability control requirements of ITER high-power poloidal field power supply, the industrial Ethernet field bus EtherCAT (Ethernet Control Automation Technology) with high real-time communication performance is selected to design the ITER poloidal field power field layer monitoring system. Due to the characteristics of large size and distributed distribution of the ITER poloidal field power supply device, as well as to ensure high reliability data transmission, the reliability of two kinds of EtherCAT ring network redundancy topologies are compared, and the EtherCAT ring network redundancy topology where the last station in slave station unit is an extension module converting E-BUS to 100BASE-TX/FX is more reliable and is adopted to design the structure of the poloidal field power supply monitoring system. The configuration software TwinCAT (The Windows Control and Automation Technology) is used to configure the system, and Human Machine Interfaces with functions such as visual display and control of live signals are drawn by this software. The experimental tests and operation demonstrate that the system can preferably realize real-time monitoring of hundreds of analog and digital signals on the field layer, and meet the high real-time and reliability control requirements of the ITER poloidal field power supply. 相似文献
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根据ITER 大功率极向场电源高实时性与高可靠性控制的需求,选取了具有高实时通讯性能的工业以太网现场总线EtherCAT(以太网控制自动化技术)设计ITER 极向场电源现场层监控系统。依据ITER 极向场电源装置体积大、分布较为分散的特点,为保障高可靠性的数据传输,对比了可构成的两种EtherCAT 环网冗余拓扑的可靠性,选取从站单元中最末端从站是将E-BUS 转换为100BASE-TX/FX 的拓展模块的可靠性较高的环网冗余拓扑来设计极向场电源现场层监控系统的拓扑结构。使用了组态软件TwinCAT(基于Windows 的控制和自动化技术)对系统进行配置,同时绘制了具有可直观显示并控制现场信号等功能的HMI 界面。经测试,该系统可实现对现场层数百路模拟与数字量信号的实时监控,满足了ITER 极向场电源的高实时性与可靠性的控制需求。 相似文献
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Pumir A Nikolski V Hörning M Isomura A Agladze K Yoshikawa K Gilmour R Bodenschatz E Krinsky V 《Physical review letters》2007,99(20):208101
The effectiveness of chaos control in large systems increases with the number of control sites. We find that electric field induced wave emission from heterogeneities (WEH) in the heart gives a unique opportunity to have as many control sites as needed. The number of pacing sites grows with the amplitude of the electric field. We demonstrate that WEH has important advantages over methods used in clinics, and opens a new way to manipulate vortices in experiments, and potentially to radically improve the clinical methods of chaos control in the heart. 相似文献
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We study the Faraday rotation of polarization of a probe field in a cold, coherently driven five-level system with an M-type configuration. By means of a method of multiple scales we derive two coupled nonlinear envelope equations, which govern the evolution of two circularly polarized components of the probe field.It is shown that due to the quantum interference effect induced by two control fields, one can obtain a large rotation angle with a very low absorption of the probe field. In addition, an efficient control over the polarization state of the probe field in the system can also be easily realized. 相似文献
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Practical implementation of an active sound control system ensuring sound suppression in outer space is described as applied to sound insulation problems for equipment whose total noise level is mainly due to low-frequency discrete spectral components. The operational principle of the proposed system is based on inverse field generation with respect to the field of the initial source of quasi-monochromatic signals. The inverse field is formed by a set of radiators, which are controlled by the signals of pressure receivers positioned in the near field of the source. Experimental studies carried out with the proposed sound control system demonstrate its efficiency and testify to the stability of its operation. 相似文献
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Homma M. Somei H. Niwa Y. Yokokura K. Ohshima I. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1999,27(4):961-968
Our new vacuum arc control technology SADE doubles the high current interruption capability of our conventional axial magnetic field technology. First, we describe the vacuum arc motion behavior recorded by a high speed charge-coupled device video camera. This arc behavior is closely related to axial magnetic field intensity. In particular, it depends on the profile of the externally generated axial magnetic field. The anode spot is likely to move to the highest magnetic field intensity. Second, we describe analytical results for concentration of vacuum arc at the anode side contact surface. This analysis implies the possibility of an ideal magnetic field profile and intensity for vacuum arc control. Finally, we describe experimental results for vacuum arc control compared with the physical and theoretical results mentioned above, and we show a practical electrode configuration for vacuum interrupters and its application in a high current interruption experiment 相似文献
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We theoretically investigate the electron dynamics of the high-order harmonics generation process by combining a near-infrared 800 nm driving pulse with a mid-infrared 2000 nm control field.We also investigate the emission time of harmonics using time-frequency analysis to illustrate the physical mechanisms of high-order harmonic generation.We calculate the ionization rate using the Ammosov-Delone-Krainov model and interpret the variations in harmonic intensity for different control field strengths and delays.We find that the width of the harmonic plateau can be extended when the control electric field is added,and a supercontinuum from 198 to 435 eV is generated,from which an isolated 61-as pulse can be directly obtained. 相似文献
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The main feature of the examined cyclic induction accelerator is the separation of control and accelerating electromagnetic fluxes. The control magnetic field is formed by analogy with the magnetic field of a weakly focusing synchrotron, and the accelerating vortex electric field is generated by electromagnetic cores – inductors. Such a design of the cyclic induction accelerator allows the active steel volume and the power of a supply unit to be reduced significantly, and the separation of control and accelerating magnetic fluxes allows the energy lost by particles by synchrotron emission to be compensated using a relatively simple method. Recent investigations have demonstrated that in this accelerator, electrons can be accelerated to energies exceeding 300 MeV. 相似文献
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We show through simulations how to control the spatial field distribution of a tightly focused Gaussian beam of polarization-shaped
femtosecond laser pulses. The field in the focus is calculated employing a decomposition into plane-wave components with appropriate
incidence angles. Both polarization directions of the shaped pulse are treated separately and then superposed coherently.
The incident polarization shape can be used to control the spatial and temporal evolution of the longitudinal field component.
PACS 42.25.Ja; 42.30.-d; 42.65.Re 相似文献
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We theoretically investigate the electron dynamics of the high-order harmonics generation process by combining a near-infrared 800 nm driving pulse with a mid-infrared 2000 nm control field. We also investigate the emission time of harmonics using time-frequency analysis to illustrate the physical mechanisms of high-order harmonic generation. We calculate the ionization rate using the Ammosov-Delone-Krainov model and interpret the variations in harmonic intensity for different control field strengths and delays. We find that the width of the harmonic plateau can be extended when the control electric field is added, and a supercontinuum from 198 to 435 eV is generated, from which an isolated 61-as pulse can be directly obtained. 相似文献
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D. P. L. Aude Craik N. M. Linke T. P. Harty C. J. Ballance D. M. Lucas A. M. Steane D. T. C. Allcock 《Applied physics. B, Lasers and optics》2014,114(1-2):3-10
We propose a surface ion trap design incorporating microwave control electrodes for near-field single-qubit control. The electrodes are arranged so as to provide arbitrary frequency, amplitude and polarization control of the microwave field in one trap zone, whilst a similar set of electrodes is used to null the residual microwave field in a neighbouring zone. The geometry is chosen to reduce the residual field to the 0.5 % level without nulling fields; with nulling, the crosstalk may be kept close to the 0.01 % level for realistic microwave amplitude and phase drift. Using standard photolithography and electroplating techniques, we have fabricated a proof-of-principle electrode array with two trapping zones. We discuss requirements for the microwave drive system and prospects for scalability to a large 2-D trap array. 相似文献
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建立了直流电场作用下协流式微流控装置中单乳液液滴乳化生成过程的非稳态理论模型,并开展了数值模拟研究,揭示了电场对液滴乳化生成动力学行为的调控机理,阐明了流场/电场参数对液滴乳化生成特性的影响规律.研究结果表明:沿流体流动方向施加静电场可在电物性参数不同的两相流体界面法线方向上产生指向内相流体的电场力,进而强化了内相流体界面的颈缩和断裂,提升了液滴生成速率和形变程度,减小了液滴生成尺寸;在同一毛细数下,随着电毛细数的增大,乳液乳化流型由每周期仅有单一液滴生成的滴式流型转变为每周期有一个主液滴并伴随有卫星液滴生成的滴式流型;随着毛细数和电毛细数的增大,黏性拖曳力以及电场力作用增强,使内相流体颈缩过程后期更容易形成细长型液线,从而有助于诱发液线上产生Rayleigh-Plateau不稳定现象,继而促进卫星液滴的形成. 相似文献
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An optimally arranged multiple-channel active-control system is known to be able to create a large quiet zone in free space for a stationary primary noise source. When the primary noise source moves, the active control of the noise becomes much more difficult, as the primary noise field changes with time in space. In this case, the controller of the control system must respond fast enough to compensate for the change; much research has been focused on this issue. In this paper, it is shown that a moving source also causes difficulties from an acoustical perspective. A moving source not only changes continuously the strengths and phases of the sound field in the space, but also changes the wavefront of the primary sound field continuously. It is known that the efficiency of active noise control is determined mainly by the wavefront matching between the primary and control fields. To keep the control system effective in the case of a moving source, the wavefront of the control field needs to change, in order to continuously match the primary-wavefront change. This paper shows that there are limitations to the control-wavefront change. An optimally pre-arranged, multiple-channel control system is not able to construct a matching wavefront when the primary source moves outside a certain range. In other words, the control system is still able to create a large quiet zone only when the primary source moves within a range around the central axis of the control system. Both the location and the size of the quiet zone change with the location of the primary source. 相似文献