Radiation damage evaluation on concrete within a facility for Selective Production of Exotic Species (SPES Project), Italy.

In the framework of research on IVth generation reactors and high intensity neutron sources a low-power prototype neutron amplifier was recently proposed by INFN. It is based on a low-energy, high current proton cyclotron, whose beam, impinging on a thick Beryllium converter, produces a fast neutron spectrum. The world database on the neutron yield from thick Beryllium target in the 70 MeV proton energy domain is rather scarce. The new measurement was performed at LNS, covering a wide angular range from 0 to 150 degrees and an almost complete neutron energy interval. In this contribution the preliminary data are discussed together with the proposed ADS facility.

http://iopscience.iop.org/article/10.1088/1742-6596/420/1/012162/pdf

Measurement of neutron yield by 62 MeV proton beam on a thick Beryllium target

Many superconducting rf activities are being pursued at LNL for present and future projects: the ALPI superconducting linac operation, maintenance and upgrading with Cu-Nb sputtered and bulk Nb cavities; the construction of the PIAVE injector with the new superconducting RFQ’s and low-beta quarter wave resonators; the development of new construction techniques by spinning of Tesla-type bulk Nb and Nbclad-Cu cavities, in collaboration with DESY, JLAB, KEK; sputtering of superconducting MgB2 thin films on samples; linac design studies and intermediate beta cavities prototyping for high intensity proton a ccelerators (TRASCO) and for future radioactive beam facilities (SPES, EURISOL). Superconducting cavity prototyping is done also in collaboration with other laboratories (CERN, TRIUMF, MSU, KFA JUELICH) for present and future superconducting linac projects. The status of these activities, the r ecent results and the future goals will be presented.

Superconducting RF activities at LNL

The design of a low-power prototype of neutron amplifier recently proposed within the INFN-E project indicated the need for more accurate data on the neutron yield produced by a proton beam with energy of about 70 MeV impinging on a thick beryllium target. Such measurement was performed at the LNS superconducting cyclotron, covering a wide angular range from 0° to 150° and a complete neutron energy interval from thermal to beam energy. Neutrons with energy above 0.5 MeV were measured by liquid scintillators exploiting their time of flight to determine the kinetic energy. For lower energy neutrons, down to thermal energy, a 3He detector was used. The obtained data are in good agreement with previous measurements at 0° using 66 MeV proton beam, covering neutron energies > 10 MeV , as well as with measurements at few selected angles using protons of 46, 55 and 113 MeV energy. The present results extend the neutron yield data in the 60–70 MeV beam energy range. A comparison of measured yields to MCNP, FLUKA and Geant4 Monte Carlo simulations was performed.

Measurement of neutron yield by 62 MeV proton beam on a thick beryllium target

https://epaper.kek.jp/e00/papers/wep5b08.pdf

Project of an advanced ISOL facility for exotic beams at LNL

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Project of an advanced ISOL facility for exotic beams at LNL