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The LPCTrap experiment uses an open Paul trap which was built to enableprecision measurements in the beta decay of radioactive ions. The initial goalwas the precise measurement of the beta-neutrino angular correlationcoefficient in the decay of 6He. Its geometry results from a carefuloptimization of the harmonic potential created by cylindrical electrodes. Itsupersedes previously considered geometries that presented a smaller detectionsolid angle to the beta particle and the recoiling ion. We describe here themethods which were used for the potential optimization, and we present themeasured performances in terms of trapping time, cloud size and temperature,and space charge related limits. The properties of the ion cloud at equilibriumare well reproduced by a simple numerical simulation using hard spherecollisions, which additionally gives insights on the trapping loss mechanism.The interpretation for the observed trapping liftetimes is further corroboratedby a model recently developed for ion clouds in Paul traps. The open trap shallserve other projects. It is currently used for commissioning purpose in theTRAPSENSOR experiment and is also considered in tests of the Standard Modelinvolving the beta decay of polarized $^{23}$Mg and $^{39}$Ca ion in the frameof the MORA experiment. The latter tests require in-trap polarization of theions and further optimization of the trapping and detection setup. Based on theresults of the simulations and of their interpretations given by the model,different improvements of the trapping setup are discussed.

The open LPC Paul trap for precision measurements in beta decay