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Recent simulations of anti-hydrogen production rely on the rate that anti-protons are slowed in positron plasmas. These plasmas are typically cold and in strong magnetic fields. This paper describes Classical Trajectory Monte Carlo calculations of the momentum transfer cross sections for positron collisions with anti-protons. We also give results for electron collisions with anti-protons. For the typical temperatures and magnetic fields in the anti-hydrogen experiments, the dominant slowing mechanism is the close, non-perturbative collisions; all previous calculations of the slowing rate are for situations where the perturbative collisions dominate. These cross sections are converted into a slowing rate as a function of magnetic field and temperature. For the parameter range of current interest, we find this to be an extraordinarily simple function.

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In distributed memory architectures like clusters, each node stores a portion of data.