In-target Isotopes Production at EURISOL

To select fission target material simulation of in-target isotopes production has been performed. Three different fission materials 238UCx, natUCx and 232ThCx have been investigated. Simulations of the most relevant isotopes are shown. Finally, natUCx and 232ThCx are the most suitable target material satisfying the project requirements

M.Barbui, J.Bermudez, O.Alyakrinskiy, L.Tecchio

Abstract of the poster to be presented at the EURONS Town meetin

Preliminary Design of Vacuum System for the Fission Target

The preliminary design of vacuum system for the fission target option is discussed. The design is based on the reference option for fission target which includes the 4 MMW Hg neutron converter (Intermediate Solution, IS) and 8 Uranium Carbide fission targets around it to produce (in-target) more than 1015 f/s fission fragments. Eight independent radioactive ion beams are delivered in a direction anti-parallel to the incoming proton beam and prepared to be delivered to the users. The design of vacuum system considers different working conditions and safety requirements, in term of vacuum level, radiation resistance materials, remote handling and radioactive gas evacuation

FISSION TARGET DESIGN AND INTEGRATION OF NEUTRON CONVERTER FOR EURISOL-DS PROJECT

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 constraint

Influence of decay in the target on the measurement of release times and release efficiency

Experimental determination of release times and release efficiencies of ISOL target devoted to production of neutron rich nuclei

EURISOL Fission Target Design adapting MAFF concept

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

Influence of radiative filiation on measured release curves

Perturbation of measured release curves of radiative nuclei by the decay of precursor nuclei in the target is investigated

Improved Design of EURISOL Fission Target Systems and Handling

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