Nature research paper: High-resolution laser resonances of antiprotonic helium in superfluid 4He
. The dominant heat transport process in the He I was due to convection, and so an infinite-plate approximation including the effects of gravity and temperature-dependent density was used to simulate the laminar convective flows.= 10 mJ energy into the entrance foil. Some ~0.8 s prior to the arrival of the antiprotons, a mechanical shutter opened and allowed part of the CW seed laser beam of power= 200 mW to enter the target.
The simulations showed that the largest heating occurred in a thin layer of He I that was located within a distance ofwere estimated to form in this region, whereas the remaining atoms were distributed in areas with much less heating.
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