Integrated Test Bed Research Articles

A large, high-gain, 400 mm single-aperture slab amplifier with 20 kJ laser output

This paper introduces a slab laser amplifier system of 400 mm single-aperture in the Integration Test Bed (ITB) laser facility. Based on the theoretical optimization model for parameters, the system uses flash-lamps with the diameter is 31 mm and the pump pulse width is 480 μs, the average small signal gain coefficient in the aperture of laser beam is 5.65%/cm. A uniformly distributed near-field output of laser can be achieved by adjusting the near-field of seed laser. The energy output reaches 20.4 kJ/4.5TW/1053 nm, the near-field modulation is 1.40:1, and the near-field contrast is 0.085.

Feasibility study of tokamak, helical and laser reactors as affordable fusion volumetric neutron sources

The applicability of tokamak, helical and laser fusion reactors as a volumetric fusion neutron source has been examined using the systems codes that have been utilised for the conceptual design of DEMO and commercial reactors in Japan. This study has clarified the characteristics of reactor-based volumetric neutron sources that can be designed based on the current physics and engineering basis with a reasonable running cost (∼5B Yen/year). Although the achievable neutron flux is 2–3 orders lower than that of accelerator driven neutron sources, tokamak and helical neutron sources can provide a much larger irradiation area for the test of large components. Laser neutron sources have both high operability and tritium breeding capacity. These reactor-based neutron sources also serve as an integrated test bed of the entire reactor system.

중국의 일대일로 초국경경제협력구 발전 현황 및 사례 연구 -호르고스와 핑샹-동당 비교-

The Trans-border Economic Cooperation Zone is a future-oriented crossborder cooperation model in which China and neighboring countries provide and share some territories, and promote cooperation not only in economic cooperation but also in non-economic fields such as justice and security. China has already built 12 cooperative districts with neighboring countries, promoting Belt & Road initiatives. Although US-NK talks about denuclearization are currently in a difficult situation, economic cooperation issues at the border among two Koreas and China may become important if North Korea’s reform and opening are realized. We can refer to the cross-border economic cooperation zone model that China is promoting with neighboring countries to jointly establish a special unification economic zone or to design a test bed for regional integration between two Koreas. In addition, the Trans-border Economic Cooperation Zone may be established in the Dandong or Hunchun areas of NK-China border (or China-unified Korea border) in the process of North Korea’s reform and reunification. Therefore, it is necessary to trace and research the development process of China’s trans-border economic cooperation zones such as Horgos, which is already developing considerably, to draw implications for Korea.

大口径N31 钕玻璃片高增益情况下热性能研究

The integration-test-bed (ITB) device is established for research on inertial confinement fusion(ICF) in China. The single-beam output energy reaches 19.6 kJ successfully when the fundamental frequency emission wavelength is 1053 nm and the pulsewidth is 5 ns. Experimental results of thermal effect of 400 mm* 400 mm aperture slab amplifiers in ITB devices show that the peak-to-valley value d_(PV) of pump-induced wave-distortion of the whole laser chain is about 5.3 lambda, in the revise extension of deformable mirror, when the gain coefficient is 5.28% cm~(-1). Combined with the optimizations of heat management, the thermal recovery time is about 2.5 h, which can satisfy the requirement of 4 h/shot.

大口径高通量实验平台反射镜在线洁净控制技术

大口径高通量实验平台反射镜在线洁净控制技术

Transient Electromechanical Modeling for Short Secondary Linear Induction Machines

Linear induction motors are under development for a variety of demanding applications including aircraft launchers and magnetically levitating trains. These applications require machines that can produce large forces, operate at high speeds, and can be controlled precisely to meet performance requirements. The design and implementation of these systems require fast and accurate techniques for performing system simulation and control system design. We present techniques for modeling and controlling linear induction machines based on a direct and quadrature (DQ) representation of the system dynamics. Simulation results using the DQ representation of the machine dynamics are presented and compared to test data from a Subscale Integration Test Bed developed for the U.S. Navy's Electromagnetic Aircraft Launch System program.

Virtual factory approach for implementation of holonic control in industrial applications: A case study in die-casting industry

Design and implementation of holonic manufacturing control systems for the real industrial applications require risky, careful decisions to ensure that the manufacturing system will successfully satisfy the demands of an ever-changing market. This paper suggests a virtual reality (VR)-based methodology for enhancing the design and implementation process of holonic control systems in manufacturing practice. The major focus has been given to the implementation of holonic control into the small to medium size manufacturing enterprises (SMEs). The ‘virtual holonic factory’ concept has been introduced, as a test bed for integration of a holonic control into a virtual factory, i.e. three-dimensional VR model of a factory in order to visually realize the effects of holonic control, when implemented to a real manufacturing system. A case study has been carried out in a medium size die-casting manufacturing plant. Through the virtual factory, a holonic control architecture for flow-line manufacturing system has been implemented for dynamic scheduling of machines in the medium size factory in order to achieve robustness necessary to handle the disturbances. The system performance and key attributes of the holonic control, such as re-configurability and robustness, have been tested and validated by using VR technology and analysis results have been presented.

10 K NbN ADC for IR sensor applications

The authors report the design, fabrication and test results of a 12-bit NbN SFQ counting A/D converter operating at 9 to 10 K and its insertion into a test IR focal plane array sensor system. The NbN IC is based on a linearized SQUID front-end which generates SFQ pulses at a frequency proportional to the signal. A gated SFQ counter integrates the signal over the sample time and the data is driven off chip through a serializing latching voltage state logic (MVTL) output shift register. The TRW A/D converter chip has been packaged and inserted into an IR focal plane array sensor test facility, or test bed, at the NASA Jet Propulsion Laboratory. The entire system has been successfully demonstrated producing IR images at 100 frames/s with the NbN A/D converter operating at 9 K, dissipating 0.3 mW. Performance of the A/D converter chip, the package including magnetic shielding and medium/high speed signal I/O, and the integrated test bed system are discussed.