LABORATORI NAZIONALI DI LEGNARO
I will describe the ISAC Radioactive Ion Beams (RIB) facility is operational since November 1998. The facility utilizes the Isotopic Separation On Line (ISOL) method to produce the RIB. The ISAC facility at TRIUMF utilizes up to 100 µA of proton at 500 MeV from the existing H- cyclotron. The science programmes at ISAC range from the nuclear astrophysics to the fundamental symmetry. The facility can deliver RIB to the low energy area and a linear accelerator composed of a 4-rod RFQ and a linear accelerator can provide beam from A = 3 to 30 amu with an energy range from 0.15 to 1.5 A*MeV. An accelerator upgrade is under way and will allow us to extend the mass range to A=150 amu and the energy up to 6.5 A*MeV. A novel approach for the target/ion source station allows us to bombard the thick target with un-precedent beam intensity without compromising the worker safety. The target/ion source assembly and heavy ion optics components are located in a shield canyon under 2 m of steel shielding allowing high proton beam intensity on thick target. At the beginning the production targets were operating at 2-5 µA but rapidly the proton beam intensity was raised to 40 µA. Now, we operate up to nearly 100 µA proton beam using the new high-power target design equipped with radial fins. Among the target R&D a Uranium carbide target using similar technique developed for the other carbide targets in use at ISAC is under way. For the moment most of the RIBs’ are produced using a surface ion source. The physics request beams that cannot be produced with such ion source and development of an ECRIS, Laser ion source and a FEBIAD are under way to extend the range of available RIB in a near future.

DATA: 03-10-2005

Sito Collegato : http://www.lnl.infn.it/~seminari/2005/3_Oct_05.htm