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Production of state-selected H2+ ions and numerical simulations of sympathetic cooling in RF traps

Abstract : The high-resolution ro-vibrational spectroscopy of the H2+ molecular ion by resonance-enhanced multiphoton dissociation (REMPD) requires a state-selective source of H2+. In this thesis we present work on a functional state selective H2+ ion source using resonance enhanced multiphoton ionisation (REMPI) with a 303 nm pulsed laser.The second part of the thesis presents numerical simulations of sympathetic cooling in linear RF traps, whose main application is the GBAR project (Gravitational Behaviour of Antihydrogen at Rest) which involves sympathetic cooling of an antimatter H̄+ ion by laser-cooled Be+ ions. We developed a GPU code using a variable timestep technique enabling a fast description of Coulomb interactions. We discuss the influence of RF heating and scaling laws between cooling times, initial energy and ion numbers in the cooling crystal. We show that the H̄ sympathetic cooling step of GBAR could be feasible using a rotationally asymmetric two-component Be+/HD+ crystal which appears more effective than a single-component Be+ crystal. We find that the H̄+ ion’s capture by this crystal could be detected experimentally by Fourier analysis of the fluorescence data.
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  • HAL Id : tel-01896819, version 1

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Nicolas Sillitoe. Production of state-selected H2+ ions and numerical simulations of sympathetic cooling in RF traps. Physics [physics]. Université Pierre et Marie Curie - Paris VI, 2017. English. ⟨NNT : 2017PA066546⟩. ⟨tel-01896819⟩

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