Project of a Next-generation ISOL Facility for Exotic Beams at LNL
In the framework of the European program to define a second generation Radioactive Ion Beam facility, LNL are proposing the construction in the next five-seven years of a specialized national facility for RIB originated by fission fragments produced by secondary neutrons. It consists on a two-accelerator ISOL-type facility to provide intense neutron-rich radioactive ion beams of highest quality, in the range of masses between 80 and 160. The conceptual design is based on a high intensity 50 MeV (100 kW) proton linac as driver and on the availability of the heavy-ion accelerator ALPI as post accelerator. The estimated neutron yield is 2 x 10 n/s at 0, high enough to satisfy the demand for an advanced RIB facility. An intense R\&D program on different items is actually in progress in collaboration with other Laboratories and University groups and is moving in a European context.
ABOUT CARBIDES-MADE NANOCERAMICS FISSION TARGET FOR RIB PRODUCTION
Intensities of RIBs can be increased with improvement of release efficiency of fission targets. One of factor, which limits release efficiency of targets, is efficiency of release of isotopes from target material. This paper presents investigation of dependence of release efficiency from ceramics target on its grain size and inter-grains pores, as well shows some efficiency limits and ways to improve it. Simulations were performed for uniform target material made from powder of uranium carbide. Inter-grain spaces are taken relative to grain sizes, as another parameter to optimize is high density of target material. Results show that optimal grain size is in the range of hundreds thousands nanometers, while recent target materials utilize one order more sizes of grains. In addition, key points of production of such ceramics are discussed. The beam technologies allow producing the nanopowders from carbides of different metals with controlled grain size. Exact methods also give to us possibilities to obtain ceramics with optimal ratio between grain and pores sizes. Possible problems and preliminary program of experiments and tests are discussed. Figure 1. Layout of the SPES target system. Left to right: protecting collimator, neutron converter inside the cooling panels, fission target, ion source.
Beam tests of a superconducting niobium cavity for a heavy ion accelerator
Abstract A superconducting reentrant niobium cavity has successfully accelerated a proton beam from a Van de Graaff accelerator. For injection energies of 1.56 and 2.75 MeV the single cavity produced the expected energy gains of 55 and 75 keV, respectively, operating at a frequency of 430 MHz, a Q of 10 9 , a peak field of 9 MV/m, and a power input of approximately 1 W. Peak fields of 22 MV/m have been achieved.