Develοpment οf an innοvative ΙSΟL system fοr the prοductiοn οf shοrt-lived neutrοn-deficient iοns

Abstract : In the frame of GANIL/SPIRAL-1 facility, an innovative target ion source system (TISS) has been designed in order to produce new competitive radioactive ion beams, and to determine to which extent it is possible to improve the production performances by optimizing a target ion source system dedicated to the production of a specific radioactive ion beam. The short-lived alkali isotope of $^{74}$Rb ($\tau$1/2 = 64.8 ms) has been chosen as a challenging case study. By studying and improving the processes involved in the TISS designed, i.e. in-target production by fusionevaporation, implantation in and release out of graphite, effusion, and ionization, an atom-to-ion transformation efficiency of 75% was predicted, leading to an ion rate of the order of $10^4$ pps at the exit of the TISS. The estimated performances would allow the GANIL / SPIRAL1 installation to deliver beams of $^{74}$Rb and $^{114}$Cs with competitive intensities never reached in other installations. The production device was developed based on my work, to cope with physics objectives and with the conditions of the SPIRAL1 operation. Efficiency, reliability and thus simplicity were essential. The system meets these requirements. The instrumentation needed for tests existed or have been specifically designed. The TISS has been built, assembled and partly tested. In parallel, issues have been addressed to answer related questions about sticking times, resistivity, and emissivity, to get inputs for the design of the TISS. Expected results with alkali isotopes encouraged us to apply the same principle to the production of neutrondeficient short-lived isotopes of noble gases and eventually to metals.
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Venkateswarlu Kuchi. Develοpment οf an innοvative ΙSΟL system fοr the prοductiοn οf shοrt-lived neutrοn-deficient iοns. Accelerator Physics [physics.acc-ph]. Normandie, Université de Caen Normandie, 2018. English. ⟨tel-01994668⟩

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