Publications: Internal Task note

Author(s) :A. Olivier-Kaiser, F. Le Blanc, C. Lau

The realisation of next-generation ion sources suitable for the EURISOL multi-mega-watt (MMW) target station needs exhaustive studies and developments. An exhaustive review was carried out to evaluate the capability of the ion-sources to operate under the irradiation conditions of the MMW target station. In addition, selectivity must be taken into account to avoid the spread of unwanted radioactivity out of the target-ion-source system (TIS). These studies led to consider RILIS (Resonance Ionization Laser Ion Source) as the reference ion source for this target station.

Author(s) :F. Negoita, L. Serbina, E. Udup, O. Alyakrinskiy, M. Barbui, J. Bermudez, L.B. Tecchio, Y. Kadi, C. Kharoua, Y. Romanets

The report discusses the constraints, solutions and options for integration of the main systems needed to assure the operation and maintenance/exchange of the fission target – ion sources assemblies capable to withstand very high neutron fluxes around EURISOL multi-MW neutron converter, to provide the desired fission rate of 10e15 fis./sec. and to extract with highest possible efficiencies the fission products as radioactive ion beam. Adapting the concepts developed for a single fission target within PIAFE and MAFF projects, simultaneous operation of six fission targets was proposed for EURISOL. A first design following these concepts was presented in a previous report. Here we describe several improvements implemented in the design for a more efficient, more reliable and safer operation. An optimized layout of the part of the EURISOL MMW station related to fission target services and handling is proposed as well.

Author(s) :J. Bermudez, O. Alyakrinskiy, M. Barbui, F. Negoita, L. Serbina, L.B. Tecchio, E. Udup

A study of a new fission target for EURISOL-DS is presented with a detailed description of the target. Calculations of several configurations were done using Monte Carlo code FLUKA aimed to obtaining 1015 fissions/s on single target. In Eurisol, neutrons inducing the fission reactions are produced by a proton beam 1GeV-4mA interacting with a mercury converter. The target configuration was customized to gain fission yield from the large amount of low energy neutrons produced by the Hg converter. To this purpose, the fissile material is composed by discs of 238-Uranium carbide enriched with 15 g of 235-U. Studies of several geometries were done in order to define the shape and composition of uranium target, taking into account the mechanical and space constraints

Author(s) :M. Cheikh Mhamed, S. Essabaa, C. Lau

The EURISOL multi-mega-watt target station requires dedicated radioactive ion sources. Notably, they must be capable of operating under extremely hard radiations and with a larger fission target producing over 1014 fissions/s. The realisation of next-generation ion sources suitable for such operating conditions needs exhaustive studies and developments. In order to take up such a challenge, a review on radioactive ion sources was achieved and the investigation on ion source parameters was in particular focused on a plasma ion source through a R&D program.

Author(s) :A. Olivier, F. Le Blanc, C. Lau

The realisation of next-generation ion sources suitable for the EURISOL multi-mega-watt (MMW) target station needs exhaustive studies and developments. An exhaustive review was carried out to evaluate the capability of the ion-sources to operate under the irradiation conditions of the MMW target station. In addition, selectivity must be taken into account to avoid the spread of unwanted radioactivity out of the target-ion-source system (TIS). These studies led to consider RILIS (Resonance Ionization Laser Ion Source) as the reference ion source for this target station.

Author(s) :V.N. Panteleev et al.

The production of neutron-rich Ag, In and Sn isotopes from a UC target of high density has been investigated at Gatchina.Electron-plasma ionization concept was investigated.

Author(s) :L.B. Tecchio

List of parameters concerning the Fission Target

Author(s) :O. Alyakrinskiy, M. Barbui, L.B. Tecchio (INFN-Legnaro) F. Negoita, L. Serbina, E. Udup (NIPNE-Bucharest)

The first two version of design as described in “Fission Target Design” report available on Task 4 pages on EURISOL web-site (http://www.eurisol.org), integrating a number of eight fission targets and ion sources around the multiMW Hg target inside one large vacuum vessel, have raised several concerns about the viability of the concept. Following the decision of EURISOL-DS Management Board, the adaptation of solutions proposed for MAFF project was studied from different points of view within tasks 2-4. In the present report, the new engineering design coming out form these studies is described and discussed.

Author(s) :F. Negoita, L. Serbina, L. Tecchio, E. Udup

The report describes the technical concepts and the main parameters adopted for the first design for the fission target of the multi-MW Target Station of EURISOL. Starting from the dimensions of liquid neutron converter as defined by Baseline Design, eight fission target containers were disposed around the converter and closely coupled to eight ion-sources. Two versions of design are presented , proposing different solutions at all levels: target geometry, heating resistance, thermal expansion compensation, supporting in the view of remote handling, type of ion source, current and high voltage powering scheme, cooling and others. At this stage of design many details are skipped, while the dimensions of different components are not yet the result of mechanical/electrical/thermal calculations.

Author(s) :Emeric Brun

A first concept for the fission boxes of the planned EURISOL facility is analysed from a thermal and structural point of view. The fission boxes in this facility consists in stacks of uranium carbide sheets surrounded by tantalum blanket which are all cooled through radiative heat exchange with a convectively cooled outer stainless steel container.