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Development of tungsten brazing technology for the upgraded KSTAR divertor was launched in early 2013. ITER grade tungsten block was brazed on the CuCrZr alloy in vacuum at 980 °C for 30 minutes using silver free brazing alloy. A OFHC-copper was used as an interlayer between tungsten and the CuCuZr. The brazing alloy is a 0.05 mm thickness of plate of which component is a Ni-Cu-Mn. It is found that...
For KSTAR divertor, tungsten (W) monoblock has been considered as plasma facing components. W monoblock components consist of three parts; pure W as the plasma facing material, oxygen-free high conductive copper (Cu-OFHC) as the interlayer and CuCrZr alloy as the tube. Finite element analysis (FEA) is performed by using ANSYS WORKBENCH. In this paper, the hydraulic thermo-mechanical analysis is performed...
Beyond 65nm node, pattern loading effect (PLE) in conventional RTP (front-side heating) has been emerged as a major yield killer. Different pattern and deposited film property strongly influence thermal absorption and emission at the integration stage of the spike anneal (e.g., STI, poly, and nitride spacers) lead to significant temperature differences across each die. Several methods for reducing...
The Korean Superconducting Tokamak Advanced Research (KSTAR) device is aimed at advanced tokamak (AT) research. Three years have passed since it achieved its first plasma in 2008. Because it is a superconducting machine and is pursuing AT research, it has unique features in terms of the machine engineering and operation. The toroidal field (TF) magnet coils are made of Nb3Sn, which provide high toroidal...
Thermally induced deformation has become more of a concern for precision machines as accuracy is getting more stringent. Unlike other indirect drives which are possible to isolate or place rotating motors, which are heat sources, away from the working area. A linear motor is a direct drive system which is heat source and placed near to the working area. Therefore, this thermal effect characteristic...
Temperature and current density are two crucial factors in electromigration study. In order to investigate the effects of these two crucial factors deeply and separately. A temperature control device, employing forced convection with a constant direction, was adopted to control the chip temperature so that the chip temperature can be decoupled from the applied current density. With this temperature...
The paper gives a description and key design features for the EAST power supply system consisting of superconducting coil power supply, inner vessel coil power supply, and additional heating power supply including microwave power supplies and neutral beam injection power supply. These power supplies are all realized by AC/DC converter, H Bridge and IGBT chopper.
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