[en] We discuss the theories in the generation and detection of laser-ultrasonics and present the results obtained from the numerical calculations based on the theories. We carry out the computation of the spatial and temporal distributions of the temperature inside the material. Calculating the displacement of the surface at the epicenter, we make discussions on the characteristics of the ultrasonic wave propagation in the thermoelastic and ablation regions. The speed and the surface motion of the material element are investigated from the solution of the Rayleigh equation. We present the results obtained from the numerical computations based on the theories. The Rayleigh waves generated by the irradiation of the pulsed laser beam in the thermoelastic region and the ablation region are discussed. Also the discussions on the heat wave propagation caused by irradiations of the ultra-short laser pulses are included in the appendix

[en] ACR (Advanced Control Room) of Next Generation Nuclear Plant is being designed using different concept from a conventional control room. The principal difference is that the KNGR ACR consists of digitalized compact workstation designed based on human factors and cognitive engineering. The Dynamic Mockup for KNGR ACR is an equipment for the purpose of verification and evaluation of MMI (Man-Machine Interface) design in prior to application of nuclear power plant control room. That is, all functions of display, alarm and control are available on Dynamic Mockup just like the real main control room. This paper shows the Dynamic Mockup and its major functions and characteristics

[en] As to the high energy pico-second Peta Watt laser technology for fast ignition, the design of front-end and pre/main amplifier were pursued and the OPCPA technology to increase the aspect ratio by reducing the pre-pulse were developed. Furthermore, the tiled-grating technology to replace a large grating were obtained. As to the fast electron generation and propagation, a solid target was used to generate MeV class electron with TW femto-second laser and a gas cluster was also used to generate MeV class electron with PW femto-second laser at SIOM

[en] We discuss the theories in the generation and detection of laser-ultrasonics and present the results obtained from the numerical calculations based on the theories. We carry out the computation of the spatial and temporal distributions of the temperature inside the material. Calculating the displacement of the surface at the epicenter, we make discussions on the characteristics of the ultrasonic wave propagation in the thermoelastic and ablation regions

[en] A thermal wave solution of a hyperbolic heat conduction equation in a thin film is developed on the basis of the Green's function formalism. Numerical computations are carried out to investigate the temperature response and the propagation of the thermal wave inside a thin film due to a heat pulse generated by ultra-short laser pulses with various laser pulse durations and thickness of the film

[en] We discuss the generation of the surface waves from the mode conversion occurred at the boundary due to the reflection processes of the ultrasonic waves. The speed and the surface motion of the material element are investigated from the solution of the Rayleigh equation. We present the results obtained from the numerical computations based on the theories. The Rayleigh waves generated by the irradiation of the pulsed laser beam in the thermoelastic region and the ablation region are discussed

[en] Laser-based ultrasonics has many industrial application in the area of nondestructive testing and evaluation (NDT and E), laser ultrasonic velocity and attenuation measurements to determine elastic constants and grain size of materials. The laser-generated ultrasonics has several advantages in NDT and E over many conventional transducers, such as the ability to achieve broad-banded excitation with high signal reproducibility and the possibility of generating a truly remote source of ultrasound by optical means on hot or rough samples and in hostile environments. The characteristics of the laser-based ultrasonic wave depend strongly on the optical penetration, thermal diffusion, elastic properties and geometry of materials as well as parameters of the exiting laser pulse including the shape, focus spot, and pulse width. A numerical analysis formulation is developed to simulate a generation of thermoelastic waves in homogeneous isotropic elastic half-space under a linefocused laser irradiation. Analytic solutions for surface displacements are obtained by employing integral transform methods to the transient elastodynamic equations. Inverse Fourier transform is numerically evaluated by making use of Filon's method and numerical inversion of the Laplace transform is performed on the basis of Crump-Durbin technique. The numerical results of the displacements and the tractions generated by a line-focused laser pulse on the surface of an aluminum block

[en] A longer cycle operation of a nuclear fuel is one of the ways to promote the economy of a nuclear power plant. For this purpose, high burn up fuel which has initial higher enrichment is required with higher loading of fuel. As a result, adequate burnable poison material must be used to control peak fuel pin power. Devices to manufacture the improved gadolinia burnable poison are developed. The improved gadolinia contains higher abundance of the preferred thermal neutron absorbers. Devices are composed of metal vapor generator, lasers and ion extractor. In this paper, a metal vapor generator by using electron beam gun is reported

[en] Roof constitutes as one of the largest surfaces in a building that receives high amount of heat through radiation, conduction and convection. The amount of heat received by a roof depends greatly on climate condition and roof design configurations. In a hot climate, roof is designed as a barrier to the hot sun, while in cold climate, roof is an amplifier that magnifies the amount of heat gains into building envelope. As Malaysia is in tropical climate, roofs in Malaysia must be able to curb heat from the sun. Latest insertion of Malaysia Standard MS1525 requirement to the Universal Building By Law (UBBL) mandate for authority approval on the achievable thermal transmittance (U-value) not greater than 0.4W/m²K for light weight roof and 0.6W/m²K for heavy weight roof. The lower the U-value, the better the roof as a barrier to the external heat. Based on a survey study done in Malaysia, only 43.18% of building practitioners are aware on the requirement, and the current implementation of the regulation involves submission of U-value numerical calculation for total roof assembly during Building Plan (BP) submission. The result of this study suggests a need for an empirical method to measure roof performance. Computer Controlled Solar Simulator (CCSS) is suggested as a platform to ensure effective implementation of MS1525 and certify that housing design in Malaysia complies with the thermal comfort requirement. (paper)

[en] KAERI had executed the laser isotope separation for nuclear material in the past, but now wants to have international collaboration in laser technologies in order to inform our peaceful purpose and to enhance nuclear transparency in the field. Also KAERI wants to keep developing our original technologies and some advanced laser technologies to be utilized in practice by international collaboration in a short period. The materials science department in INL and the quantum optics division in KAERI has cooperated in both laser ultrasonics and nondestructive examination fields. Ultrashort laser ultrasonics and resonance spectroscopy for laser ultrasonics were collaborated. And we also develop our own experimental facility from the experience obtained from collaboration with INL