Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Poster Session: Matter at Low Temperature

TT 11.16: Poster

Monday, March 14, 2011, 14:00–18:00, P4

Optimization of evaporation trajectories in weightlessness — •Roman Nolte — TU Darmstadt

Evaporative cooling is the essential method for attaining quantum degeneracy. Nowadays, optimization of evaporative cooling is done in the laboratory as an iterative process. Speed and yield are important aspects but usually not system critical. Not so, in the QUANTUS experiment [1], which explores quantum gases in microgravity. There evaporation time as limited resource and should be as short as possible.

In this contribution, we examine in detail the nonequilibrium process of evaporation in time-dependent traps for a classical gas [2]. We compare solutions of the ergodic Boltzmann equation with N-particle molecular dynamics codes performed on graphic cards. Results of various numerical simulations of particular evaporation processes are compared for the purpose of optimizing yield and duration.
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O. J. Luiten et al., Phys. Rev. A 53, 381-389 (1996)