Zeeman deceleration beyond periodic phase space stability
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...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Published: |
IOP Publishing
2017
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| _version_ | 1797093512895791104 |
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| author | Toscano, J Tauschinsky, A Heazlewood, B Dulitz, K Renick, C Softley, T |
| author_facet | Toscano, J Tauschinsky, A Heazlewood, B Dulitz, K Renick, C Softley, T |
| author_sort | Toscano, J |
| collection | OXFORD |
| description | 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 (CMA-ES) 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. |
| first_indexed | 2024-03-07T04:01:33Z |
| format | Journal article |
| id | oxford-uuid:c4bea199-fdc7-42c6-805f-40a1857c99a9 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T04:01:33Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:c4bea199-fdc7-42c6-805f-40a1857c99a92022-03-27T06:25:49ZZeeman deceleration beyond periodic phase space stabilityJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c4bea199-fdc7-42c6-805f-40a1857c99a9Symplectic Elements at OxfordIOP Publishing2017Toscano, JTauschinsky, AHeazlewood, BDulitz, KRenick, CSoftley, TIn 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 (CMA-ES) 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. |
| spellingShingle | Toscano, J Tauschinsky, A Heazlewood, B Dulitz, K Renick, C Softley, T Zeeman deceleration beyond periodic phase space stability |
| title | Zeeman deceleration beyond periodic phase space stability |
| title_full | Zeeman deceleration beyond periodic phase space stability |
| title_fullStr | Zeeman deceleration beyond periodic phase space stability |
| title_full_unstemmed | Zeeman deceleration beyond periodic phase space stability |
| title_short | Zeeman deceleration beyond periodic phase space stability |
| title_sort | zeeman deceleration beyond periodic phase space stability |
| work_keys_str_mv | AT toscanoj zeemandecelerationbeyondperiodicphasespacestability AT tauschinskya zeemandecelerationbeyondperiodicphasespacestability AT heazlewoodb zeemandecelerationbeyondperiodicphasespacestability AT dulitzk zeemandecelerationbeyondperiodicphasespacestability AT renickc zeemandecelerationbeyondperiodicphasespacestability AT softleyt zeemandecelerationbeyondperiodicphasespacestability |