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Temperature measurement of 6He +  ions confined in a transparent Paul trap

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Abstract

The LPCTrap setup is a transparent Paul trap dedicated to the measurement of the βν correlation coefficient a βν in the β decay of trapped radioactive nuclides. In a first experiment, the system has been used to record ∼105 coincidences between the β particles and recoiling ions emitted from the decay of 6He +  ions. The analysis of the collected data has already shown that the size of the 6He +  ion cloud confined in the Paul trap is a critical parameter, potentially limiting the accuracy on the a βν measurement. We report here the precise determination of the trapped ion cloud temperature and size. This was performed by extracting the trapped ions toward a position sensitive micro channel plate detector at different phases of the RF driving field. We find a temperature T exp  = 0.107(7) eV, consistent with the temperature values inferred using two other observables but 20% higher than the temperature T sim  = 0.09 eV predicted by realistic simulations of the ions interacting with the H2 buffer gas.

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Correspondence to X. Fléchard.

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Fléchard, X., Ban, G., Durand, D. et al. Temperature measurement of 6He +  ions confined in a transparent Paul trap. Hyperfine Interact 199, 21–27 (2011). https://doi.org/10.1007/s10751-011-0297-5

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  • DOI: https://doi.org/10.1007/s10751-011-0297-5

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