DEVELOPMENT OF A RADIOACTIVE ION-BEAM FACILITY USING 15 UD TANDEM ACCELERATOR AT NSC

An inflight radioactive ion beam (RIB) facility is being developed at the Nuclear Science Centre (NSC), using the existing 15 UD Pelletron a ccelerator and the recoil mass spectrometer (RMS) HIRA. Though the bas ic principle of operation of the facility will be similar to those des cribed in [1-3], ion optics of the facility are optimized for precise nuclear reaction measurements. In this facility, primary beams from th e Pelletron accelerator will be used to produce RIB species using reac tions such as (p, n), (d, n), (He-3, n) etc in inverse kinematics. To ensure an efficient beam rejection for inverse kinematic reactions wit h good focusing of the RIB, HIRA will operate in a new ion optical mod e. In this mode, there is an intermediate focal plane where a beam fil tering slit system will be installed to stop primary beam particles wh ile allowing RIB particles to be transported unhindered to the final f ocal plane which will be the secondary target position. In the case of many RIB species, more than one charge state will be focused into a s ingle spot at the experimental target site. The design and installatio n of hardware for the facility is in progress. I :IB species such Be-7 , Li-8,N-13 etc, will be available with intensity in the range of 10(5 )-10(6) pps with similar to 3 mm diameter spot size with high purity. The facility is expected to be operational for user experiments by the end of 1998.