Zeeman deceleration beyond periodic phase space stability

Jutta Toscano, Atreju Tauschinsky, Katrin Dulitz, Christopher J. Rennick, Brianna R. Heazlewood, Timothy P. Softley

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)
    129 Downloads (Pure)

    Abstract

    In Zeeman deceleration, time-varying spatially inhomogeneous magnetic fields are used to create packets of translationally cold, quantum-state-selected paramagnetic particles with a tuneable forward velocity, which are ideal for cold reaction dynamics studies. Here, the covariance matrix adaptation evolutionary strategy is adopted in order to optimise deceleration switching sequences for the operation of a Zeeman decelerator. Using the optimised sequences, a 40% increase in the number of decelerated particles is observed compared to standard sequences for the same final velocity, imposing the same experimental boundary conditions. Furthermore, we demonstrate that it is possible to remove up to 98% of the initial kinetic energy of particles in the incoming beam, compared to the removal of a maximum of 83% of kinetic energy with standard sequences. Three-dimensional particle trajectory simulations are employed to reproduce the experimental results and to investigate differences in the deceleration mechanism adopted by standard and optimised sequences. It is experimentally verified that the optimal solution uncovered by the evolutionary algorithm is not merely a local optimisation of the experimental parameters - it is a novel mode of operation that goes beyond the standard periodic phase stability approach typically adopted.

    Original languageEnglish
    Article number083016
    JournalNew Journal of Physics
    Volume19
    Issue number8
    Early online date11 Jul 2017
    DOIs
    Publication statusPublished - 16 Aug 2017

    Keywords

    • decelerator sequence optimisation
    • evolutionary strategy
    • Zeeman deceleration

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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