In recent years, hohlraum experiments have been performed extensively on Shenguang series laser facilities in the context of laser indirect-drive inertial confinement fusion. Multiple aspects about the hohlraumenergetics, drive symmetry and plasma condition are studied by a variety of methods resolving different photon ranges and multiple viewing areas. To improve the experimental uncertainty, several diagnostics are optimized and calibrated, also the power balance and pointing accuracy of laser beams are evaluated and improved. These works lead a rapid progress on hohlraum experimental capabilities and a series of successful experimental campaigns. In order to further optimize the hohlraum performance, other hohlraum geometry (the spherical hohlram with six LEHs and the cylindrical hohlraum with six LEHs) and hohlraum wall material (depleted Uranium and foam Au) are explored as well. Hohlraum experiments and modeling on Shenguang series laser facilities demonstrated quantitative understanding of the laser conversion, X-ray ablation and plasma motion in different regions.

Fluorescence imaging of surrogate Si-doped CH targets has been used to provide a measurement for drive condition of high-energy x-ray (i.e. M-band x-ray) drive symmetry upon the capsule in hohlraum on Shenguang-II laser facility. A series of experiments dedicated to the study of photo-pumping and fluorescence effect in Si-plasma are presented. To investigate the feasibility of fluorescence imaging in Si-plasma, an silicon plasma in Si-foil target is pre-formed at ground state by the soft x-ray from a half-hohlraum, which is then photo-pumped by the K-shell lines from a spatially distinct laser-produced Si-plasma. The resonant Si photon pump is used to improve the fluorescence signal and cause visible image in the Si-foil. Preliminary fluorescence imaging of Si-ball target is performed in both Si-doped and pure Au hohlraum. The usual capsule at the center of the hohlraum is replaced with a solid Si-doped CH-ball (Si-ball). Since the fluorescence is proportional to the photon pump upon the Si-plasma, high-energy x-ray drive symmetry is equal to the fluorescence distribution of the Si-ball.

We describe an experimental technique to measure the drive symmetry of M-band radiation on the capsule in hohlraum. M-band radiation from the corona of the laser-produced gold plasma, especially the laser spot regions in the cavity, was used to pump x-ray fluorescence of a thin layer of Si-tracer coated on a solid CH-ball. The fluorescence images were time resolvedly recorded by an x-ray framing camera and the drive asymmetry due to M-band radiation was deduced from these fluorescence images. Moreover, a Si-doped gold cavity was used with the initial purpose of maximizing the fluorescence signal through resonance transitions. Since the Si-plasma expands more rapidly than the gold-plasma, the evolution of drive asymmetry was accelerated in Si-doped hohlraum.

In order to improve the efficiency of data acquisition in large-scale scientific experiment, a web-based integrated control software platform is developed to realize the remote centralized control for various types of digital oscilloscopes. A unified hierarchical system structure is proposed to reduce the developing difficulty and increase the extensibility, which divides the system into six layers—the device layer, the hardware device driver layer, the device abstraction layer, the FEP(Front End Processor) device service layer, the application service layer and the presentation layer. The new type of digital oscilloscope can be added to the integrated control software platform easily by developing a driver interface, and it is the same to other diagnostic equipments, such as DAQ(Data Acquisition) card and scientific grade CCD(Charge coupled Device) camera. The application of this system shows that, the system integration method introduced in this paper is suitable for large-scale physics experiment data acquisition and control system, and the web-based integrated control software platform can improve the operation efficiency of experiment significantly.

Brushless DC (BLDC) machines are found increasing use in applications that demand high and rugged performance. In some critical circumstance, such as aerospace, the motor must be highly reliable. In this context, a novel model-based fault diagnosis system is developed for brushless DC motor speed control system. Under the consideration of the complexity of characterizing the dynamic of BLDC motor control system with analytic expression, a LRGF neural network (LRGFNN) with pole assignment technique is carried out for modeling the system. During the diagnosis process, fault signal of the motor is isolated with LRGFNN online. Meanwhile, adaptive lifting scheme and adaptive threshold method are presented for detecting the faults from the isolated fault signal under the existence of mechanical error and electrical error. The effectiveness of the diagnosis system is demonstrated in the simulation of electrical and mechanical fault in the motor. The detection of the incipient fault is also given.

基于国内惯性约束聚变实验精密化需求,开展了可见光CCD机械快门特性研究的分解实验,定量表征了机械快门的时间特性,不仅为物理实验参数设置提供了依据,也对信号强度不确定度的定量分析提供了基准数据.另外根据物理实验的实时控制需求,设计开发了一套机械快门状态检测系统,它能及时快速反馈快门运转情况,提高了实验的可靠性.

This article briefly states the preparation process of laser target without glue spot.For the original plane target,the rod is bonded to the plane.For the improved target,the disk comes into connection-used gold wire.And the gold and the rod are bonded together,so as to avoid the glue left on the plane surface.In the electric spark process,the pulse spark between the tool and the workpiece discharges.And the produced local and instantaneous high temperature erodes the metal little by little.So the tool and the workpiece do not contact each other,which is advantage in micro machining.The important thing is one-time-molding,which not only ensures the processing precision,and also improve the processing efficiency,and saves time and effort.The successful development of the laser target without glue spot improves the assembly quality of laser target,makes the manufacturing precision of the laser target improved,and provides the conditions for the physics experiment.

This paper introduces a integrated control system of scientific CCD cameras of ditteront manufaeturos. The structure, lunctmns and implement method is described. Its advantage, shortcoming and application in laser irradiation experiments is introduced. The application of the integrated system of CCD cameras can improve operation efficiency of experiments and improve reliability of data acquisition.

利用数字信号发生器及示波器对积分束流仪（ICT）的输入输出特性进行了标定,给出了不同脉冲宽度及幅度的输入信号与ICT输出结果的电荷量比值关系、输入脉冲对ICT的输出脉冲宽度的影响以及ICT对连续脉冲信号的输出响应等。标定结果显示:ICT的输入输出满足很好的线性关系;当输入连续脉冲的间隔小于一定程度时,ICT将会视为一个信号输出;ICT的输出脉冲形状及脉冲宽度与输入信号的形状及幅度无关。

利用高品质化学气相沉积(CVD)金刚石,采用微带线结构研制了CVD金刚石软X射线探测器.利用脉宽为10 ps的激光器进行了探测器响应时间的测量,获得半宽度为115 ps的信号,经过计算得到CVD金刚石探测器的上升时间为49 ps.在激光原型装置实验中,通过与软X射线能谱仪测量结果的相互比对,证实所研制的CVD金刚石探测器是一种响应时间快、信噪比高、性能可靠的软X射线探测器.

Summary form only given. The ICF experiments performed at Shenguang II facility need to measure the total energy of stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) as well as the weak backscattered SRS and SBS. Generally used laser calorimeter whose sensitivities are rather low, cannot meet the needs of such measurements. Because of long signal cable and AC power disturbance, simply boosting the amplifier gain will lead to the weak signal submerged by noise. Equipped with third order low pass active filters and software smooth filter, the multi channel bulk absorption laser calorimeter introduced in this paper, can significantly restrain the noise. Thus, the sensitivity of laser calorimeter can be greatly improved about two orders higher by means of boosting the amplifier gain than that of the normal type laser calorimeter. Using the new type laser calorimeter in the ICF experiments performed at Shenguang II facility, we obtained results different from that before. The experimental arrangement and the results are presented

An improved eight power splitter is designed and fabricated newly,which is crucial in the timescale system of soft X-ray energy dispersive spectrometer.The spectrometer is used in ICF laser facility to measure the evolution of soft X-ray spectrum,whose duration is only several nanoseconds.The synchronization and high bandwidth of signals produced by power splitter are tested,which shows the power splitter could meet the strict requirements of the experiments.The discussion of further improvement of power splitter are also presented.

This paper describes the principle of neutron yield measurement with ICF activation taking example for Cu、γ-γ coincidence counting system based on PXI、software configuration and function、the counting method of neutron yield and the calibration coefficient.

Summary form only given. Lead activation system is used to measure very low yield (above 106) of DT reaction, and it can also be applied to measure DD reaction neutrons (2.45 MeV). These neutrons produce 207mPb radioactive nuclide by the reaction 208 Pb(n,2n)207mPb and 207Pb(n,n)207mPb in Pb sheath that surrounds a NaI(Tl) detector or 1.5 cm thick Pb disks in front of NaI(Tl) detector. Using this detector, adding amplifier, single-channel and multi-channel scaling counting system in computer can measure the 1.06 MeV and 570 keV gamma rays from the 207mPb atoms with 0.8 s half-life decay, and then the yield may be calculated. Because half-life decay of 207mPb atoms is too short to move activated sample to measure room manually or mechanic, the detection system is placed as close as 32 cm from the laser target, the X-rays burst from the laser irradiated target generates about 106 times more light intensity in NaI(Tl) detector than does an individual gamma ray from the 207m Pb. To minimize this effect, a gate circuit removes the detector high voltage 200 ms to 1 s adjustable, then restores it less than 100 ms after the shot. The drift of the peak of the pulse-height spectrum is unavoidable because of the NaI(Tl) detectors and the electronic system, it will affect right use of the system. We used an embedded multi-channel pulse height analyzer in multi-channel scaling counting system to adjust the peak of the multi-channel pulse height spectrum in time. It is very easy and fast to adjust the system by this way. This system is calibrated by pulse neutron tube, and it is used successfully in ICF experiment on Shenguang-II facility in 2005. Its rate of signal and noise is above 200, and uncertainty is less than 20% when it is used in measuring neutron yield above 1times107

In this paper, an integrated diagnostic system built and used at Shenguang II and Xingguang II laser facility for inertial confinement fusion experiment has been reviewed. The progress of diagnostic technique for Xray optical band, fusion products has been emphasized. The many diagnostic instruments, such as three chromatic spectrometer (TCS) that consists of Xray streaked camera and was applied in many experiments, have been developed. The Xray's temporalspatial behaviors of three kinds of wavelength could be investigated in the meantime using TCS. The application on investigation of hohlraum target physics, implosion dynamic and opacity have been introduced.

介绍了一套基于微机局域网的ICF综合实验数据采集和处理系统,从基本物理实验需求的分析到系统软硬件的选择、物理测试节点的入网和实验数据的共享和管理等方面阐述了其整个建立过程,给出了实用系统的结构和其应用情况.

The conception of polymorphous and its application in data acquisition program which supports multi type of hardware is introduced in this paper. The advantages of this object oriented programming approach used in data acquisition program are described.

Design of a database system used in data acquisition and processing in ICF experiment is introduced in this paper. We give brief descriptions on the selection process of the database system platform, hardware environment,the special input function of the database and the related technology situation from physics experiment requirement. A practicality centralization experiment database system is given.

The designing rules of new data file formats of laser irradiation experiments are introduced in this paper. Object oriented programs are designed in studying experimental data of the laser facilities. The new format data files are combinations of the experiment data and diagnostic configuration data, which are applied in data processing and analysis. The edit of diagnostic configuration data in data acquisition program is also described.

The wavelength dependence of absorption of laser has been studied experimentally in the Shen Guang type and Xing Guang type laser facility with the gold disks at a chosen angle of incidence. The experiments show that inverse bremsstrahlung absorption is the main absorption mechanism, and the absorption increases when laser wavelength decreases. Although the absorption of 0.351 μm laser at 10 ° angle of incidence is higher than that of others, the absorption of 0.351 μm laser at 45 ° angle of incidence is only 75% and scattered light is up to 25%.