A beamline tuning system based on automatic procedure for steering a beam with observing the beam position has been under development for the transport of high energy beams at HIMAC. A daily beamline tuning for radiotherapy and for most biological experiments is carried out to precisely transport the beam to beam delivery devices. This system replays the daily procedure automatically. A beam is steered using steering magnets in accordance with the deviation of beam positions from intended beam positions. How much the beam positions shift due to adjusting a steering magnet is determined by the beam optics design. Therefore, if correlation between deflection angles at the steering magnets and variations in the beam position measured by wire-grids are known, the deflection angles can be calculated by solving linear simultaneous equations. The correlation was measured and compared with those calculated. Most of them are in good agreement. At present, the beamline tuning for delivering beams to the biological experiment room is finished in about 10 minutes automatically.
An accurate knowledge of hydro-dynamic behavior of a liquid film flow on nuclear fuel rods is indispensable for analysis of the CHF under postulated loss-of-coolantaccidents in boiling water reactors. Despite of this importance, the microscopic knowledge of liquid film flow in the rod bundle is still not enough for us to construct the physical model for CHF analysis. Especially flow near the spacer is very unstable and complicated, so it is very difficult to obtain its information experimentally.The objective of the present work is to investigate on the liquid film flow in rod bundle channel experimentally, and to obtain the details of the behavior of liquid film and droplets with high resolutions of time and space. Liquid film flow in a 3x3 bundle channel simulated nuclear fuel assembly was visualized with about less 10µm and 100 µsec resolutions by using high speed video camera with the Cassegrain optical system. The shape and motion of liquid droplets in the rod bundle were observed directly, and the surface of liquid film were also visualized. Several interesting behaviors of liquid droplets and liquid film were observed and are reported in the present work. Image analysis were also conducted for evaluating the size of liquid droplet quantitatively.
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