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(FTP1/27(R)) Simulation Study of Evacuation and Effects of Metal Vapor in Laser Fusion Liquid Wall Chamber

Y. Kozaki¹⁾, M. Kabetani¹⁾, H. Nagatomo¹⁾, T. Norimatsu¹⁾, H. Furukawa²⁾, K. Yamamoto¹⁾, K. Mima¹⁾, A. Sunahara¹⁾, S. Nakai¹⁾, T. Yamanaka^1)
 
1) Institute of Laser Engineering, Osaka University, Osaka, JAPAN
²⁾ Institute for Laser Technology, Osaka, JAPAN

Abstract.  Simulation studies on evacuation process in liquid wall chamber have been carried out. The evacuation speed in liquid wall concepts is a critical issue for pulse repetition rate. Then we have analyzed the evacuation process in high vacuum region using DSMC code, which solve the Boltzmann equation. The simulation results of the DSMC code show that the effect of viscosity can't be neglected in the region where the gas pressure goes down to 10^-3 $\sim$ 10^-4 Torr, near the saturated vapor pressure. When the surface temperature of liquid wall is adequately cooled, the evacuation speed from 10^-2 to 10^-4 Torr is rather fast because of the gas flow to the wall. A preliminary estimation on the influence of chamber gas to the performance of a fuel pellet and trajectory of pellet injection is carried out to identify the required level of residual gas pressure.

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