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• W2912534036 abstract "The structure of matter and the fundamental lows of nature have always marked the interest of the nuclear physics community, especially in the understanding of the atomic nucleus stability. The knowledge of how the fundamental particles behave is besides leading a strong development of applied science, with the consequent improvement or invention of useful technologies in industry, medicine and scientific research. European Council for Nuclear Research, CERN (Geneva – Swiss) is the most important nuclear physic laboratory, which houses the world’s largest and most complex scientific instruments devoted to these purposes. In Italy, from the mid-twentieth century and especially in the recent decades, the National Institute of Nuclear Physics (INFN) became one of the main members, participating with shared activities and offering new projects of interest. At Legnaro National Laboratory (INFN-LNL, Padua, Italy), the SPES project, ie Selective Production of Exotic Species, is the flagship of INFN under development and construction, which has the goal to produce pure radioactive ion beams in the neutron rich side of the so-called “valley of stability”. The construction of the SPES facility involves multidisciplinary teams and worldwide collaborations as the University of Padua (Italy), Laboratory for Emerging Nanometrology (LENA, Germany), Isotope Separator On Line Device project (ISOLDE-CERN, Swiss), Oak Ridge National Laboratory (ORNL, USA) and iThemba LAB (South Africa).The ion-sources dedicated to the production of Radioactive Ion Beams (RIB) have to be highly efficient, selective (to reduce the isobar contamination) and fast (to limit the decay losses of short-lived isotopes). For radioactive beam generation the source must operate steadily for extended periods of time at elevated temperatures (up to 2000°C). The selection of the most appropriate choice for the target/ion source is of paramount importance since its performance determines the intensity, the beam quality, and the number of radioactive beams that can be provided for experimental use. The world wide spread RIB facilities came up with a large variety of solutions to meet part or all of these requirements such as: surface, plasma, electron cyclotron resonance and laser ion-sources. The latter, which is based on the Resonant Laser Ionization (RLI) technique is fundamental in the ISOL facility due principally to the high ionization efficiency can be obtained and to the high mass-selectivity of the process. Its selectivity, namely the low production rate of unwanted species, is strongly affected by the surface ionization mechanism, which occurs since both laser and surface ion sources share same components where the ionization process takes place. The production of pure beams and the knowledge of its efficiency in the context of ISOL facilities, is the most important aspect on which the research activities are actually focused. For these reasons, the main goal of the work here presented was the development of a test bench, called Laser Front End, which allows estimating the ionization efficiency of the laser in absence of contaminants and thus providing essential information for the future on-line tests. Beside the Laser Front End, ancillary devices for its construction have been designed, developed, constructed and finally tested.Chapter 1 gives a general overview of the ISOL facilities, their applications and a general overview of the SPES project. Chapter 2 will present the design of the Laser Front End, with particular attention to the Knudsen cell design aimed to estimate the laser ionization efficiency. Then, in Chapter 3, the re-design of the quadrupole triplet for the ion beam transport will be provided, whereas in Chapter 4 the preliminary design of both vacuum and gas recovery systems are described. Finally, Chapter 5 provides the study, the test and the re-design of a commercial flexible transmission joint on which fatigue failure occurred despite compliance with installation recommendations had been assured." @default.
• W2912534036 created "2019-02-21" @default.
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• W2912534036 date "2018-01-08" @default.
• W2912534036 modified "2023-09-23" @default.
• W2912534036 title "Study and design of ion beam production devices for the SPES project" @default.
• W2912534036 hasPublicationYear "2018" @default.
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