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Nuclear Instruments and Methods in Physics Research A 544 (2005) 111116 Vapor condensation study for HIF liquid chambers

Summary: Nuclear Instruments and Methods in Physics Research A 544 (2005) 111­116
Vapor condensation study for HIF liquid chambers
P. CalderoniĆ, A. Ying, T. Sketchley, M.A. Abdou
Mechanical and Aerospace Engineering Department, UCLA, 44-114 Eng IV, 420 Westwood Plaza, Los Angeles, CA 90095-1597, USA
Available online 23 February 2005
This paper presents the experimental study of transient cooling and condensation of the prototypical material flibe
under conditions relevant to Heavy Ion Fusion (HIF) power plants. Superheated vapor is generated by a high-current,
pulsed electrical discharge over a pool of liquid flibe. The excited vapor expands inside a temperature-controlled
chamber designed to scale the initial density of the generated vapor, the initial energy density and the surface area
available for condensation, considering HYLIFE-II as the reference design. Clearing rates are evaluated from the
measured pressure history. Mass spectroscopy is used to characterize the composition of the residual gases. SEM
analysis of material deposited on witness plates is also presented, showing that interface phenomena during the initial
expansion phase depend on the orientation of the condensation surface relative to the gas velocity. The results show
that chamber clearing can be characterized by an exponential decay with a time constant of 6.58 ms. However, the
equilibrium pressure is one order of magnitude higher than the desired HIF base pressure because of the presence of
non-condensable impurities dissolved in the material available for the experiments. If the exponential decay is applied
to the pressure range of the reference design, the resulting period for chamber clearing is 60 ms. The conclusion is that
condensation rates of flibe vapor are sufficiently fast to allow HIF power plants repetition rates, and that the main issue
for flibe vapor condensation lies in the control of the impurities dissolved in the salt.


Source: Abdou, Mohamed - Fusion Science and Technology Center, University of California at Los Angeles


Collections: Plasma Physics and Fusion