[en] A weak-strong beam simulation code (BBSIM) is used to study the compensation of long range beam-beam effects by current carrying wires at the Relativistic Heavy Ion Collider. Tune footprints and tune scans of diffusive aperture are presented for various wire separation distances. Beam life time is estimated using the dependence of the transverse diffusion coefficients on initial action. Comparison of the loss rate from tracking with that measured by BNL is presented

[en] We investigate the dynamics of longitudinally flat bunches created with a second harmonic cavity in a high energy collider. We study Landau damping in a second harmonic cavity with analytical and numerical methods. The latter include particle tracking and evolution of the phase space density. The results are interpreted in the context of possible application to the LHC. A possible path to a luminosity upgrade at the LHC is through the creation of longitudinally flat bunches. They can increase the luminosity roughly by 40% when the beam intensities are at the beam-beam limit. Lower momentum spread which can reduce backgrounds and make collimation easier as well lower peak fields which can mitigate electron cloud effects are other advantages. Use of a second harmonic rf system is a frequently studied method to create such flat bunches. Here we consider some aspects of longitudinal dynamics of these bunches in the LHC at top energy. First we consider intensity limits set by the loss of Landau damping against rigid dipole oscillations. Next we describe numerical simulations using both particle tracking and evolution of the phase space density. These simulations address the consequences of driving a bunch at a frequency that corresponds to the maximum of the synchrotron frequency.

[en] In high energy storage-ring colliders, the nonlinear effect arising from beam-beam interactions is a major source that leads to the emittance growth, the reduction of beam life time, and limits the collider luminosity. In this paper, two models of beam-beam interactions are introduced, which are weak-strong and strong-strong beam-beam interactions. In addition, space-charge model is introduced.

[en] To develop an optode membrane with a high sensitivity and a wide detection range, a photoinduced electron transfer fluorescence dye (FWSA) possessing an acrylate moiety was synthesized and covalently immobilized on a 2-hydroxyethyl methacrylate-based network polymer matrix. The prepared membranes displayed the fluorescence 'turn-on' detection of water over a wider operating sensing range. The sensitivity of the optode membrane was influenced by the crosslinker. The sensitivity of the membrane M1 using dimethacrylamidated poly(dimethylsiloxane) (AMPS) as a crosslinker was superior to that of M2 and M3 membranes using tetra- or triethylene glycol dimethacrylate. As the water content was increased from 0 to 80% in water-miscible organic solvents, the M1 membrane showed a gradual fluorescence enhancement. The sensing performance of the M1 membrane was evaluated for aqueous methanol, ethanol, acetone, and dimethyl sulfoxide solutions in terms of the detection range, response time, reproducibility, and stability

[en] Thermal evaluation of a cask using three-dimensional models is especially difficult if the spent fuel assemblies are modeled explicitly and included in the analysis. These assembly elements are modeled as solids with homogenous 'smeared' or 'effective properties'. This solid method can predict the peak cladding temperatures of casks with reasonable accuracy. One of the solid methods is CFD simulation on transverse cross-section of a spent fuel assembly. The temperatures of a spent fuel assembly were calculated by using the conduction, convection and radiation in heat transfer. 3D CFD simulation is used for this calculation. 3D CFD simulation was performed to predict the peak cladding temperature of a spent fuel assembly. The maximum temperature of 3D simulation is lower than that of 2D. This result would come from the difference of heat transfer modes used for simulation. The axial length of the assembly modeling would be not enough to study the trend of the temperature.

[en] The purpose of this paper is to evaluate the effects of the external cooling water injection during the SBLOCA for Wolsong NPP 1. For Wolsong NPP 1, the external emergency cooling water injection into the primary and secondary systems by using mobile diesel driven pump has been incorporated as an additional measure to mitigate the consequences when an accident occurs. As a part of the action items after the Fukushima accident, KHNP has been undertaking the external emergency cooling water injection through EWS for both primary and secondary systems to mitigate the accident at the site. In addition to the existing ECCS and EWS, if the external cooling water injection by using the mobile diesel pumps is considered for the primary and secondary systems, it could result in a great improvement on the safety for the nuclear power plant. Since SBLOCA is considered to have the highest frequency of core damage among LOCAs, it was evaluated based on PSA methodology to analyze the effects on the safety of NPP resulting from the external injections

[en] A push-pull conjugated dye with a dicyanomethylene-1,4-dihydropyridine moiety (DCMP) was designed and synthesized for use as an optical pH sensor in acidic solution. The spectroscopic and pH-sensing properties of DCMP were investigated by UV-vis and fluorescence spectroscopy. DCMP displayed a pH-dependent ratiometric absorption property in the range of pH 4.5-12.0. The fluorescence intensity of DCMP around 560 nm, when irradiated at 435 nm, increased when pH was increased in the range of 2.0-7.0, showing a linear response in the pH range of 3.85-6.25.

[en] We report a highly-adherent 30-μm Cu conductive-path coating on an aluminum-oxide layer anodized on an aluminum-alloy substrate for a metal-printed circuit-board application. A 50-nm Al layer was first coated with an e-beam evaporative deposition method on the anodized oxide, followed by ion bombardment to mix the interfacial region. Subsequently, a Cu coating was deposited onto the mixed seed layer to the designed thickness. Adhesions of the interface were tested by using tape adhesion test, and pull-off tests and showed commercially acceptable adhesions for such thick coating layers. The ion beam mixing (IBM) plays the role of fastening the thin seed coating layer to the substrate and enhancing the adhesion of the Cu conductive path on the anodized aluminum surface.

[en] Recently, aluminum base metal PCB is drawing interest with the development of high power light emitting diode (LED). The thermal dissipation property of PCB is crucial for stable operation and prevention of degradation of LED. In this work we have applied direct formation of the oxide layer on the metallic substrate followed by the conductive layer coating. This epoxyfree PCB structure is expected to show a higher thermal dissipation property. However, Van der Waals forces between atoms of metal film and non-reacting ceramic substrate can provide only extremely weak adhesion. We utilize the ion beam mixing (IBM) method for the enhancement of the adhesion at metal-ceramic interfaces. The variables of the IBM process consist of the film thickness, the ion energy, the mass of the incident ions, the irradiation temperature, and the ion dose

[en] Oil sands, one of the unconventional energy resources, are found in relatively deeper layers than other resources. Therefore, oil sands are generally extracted by steam assisted gravity drainage (SAGD), which is an underground recovery method in which high-temperature steam is injected together with organic solvent. In this process, a free-water knockout (FWKO) is necessary to process the large amounts of water used, and this oil-water separator separates two-phase or multiphase working fluids so that the next process can be performed. In this study, the effects of various design factors of the oil-water separator (the main process unit of the oil sand plant) on the separation performance were investigated numerically. Using the pseudo-transient method which is based on the finite volume method, the effects of the vane distributor, cyclone separator, and modularization on the separation performance were analyzed.