Abstract
The Super Separator Spectrometer S3 is a device designed for experiments with the very high intensity stable ion beam of the superconducting linear accelerator of the SPIRAL2 facility. Its Physics goals cover the study of radioactive ions produced by fusion-evaporation reactions, like superheavy elements or neutron deficient nuclei close to the proton drip line, but also neutron rich nuclei produced by multi-nucleon transfer reactions as well as ion-ion atomic interactions. It is composed of a two-step separator, with a momentum achromat followed by a mass spectrometer. Superconducting multipole triplets, combining quadruple, sextuple and octupole fields, allow a combination of high transmission and mass resolution. A specific open multipole has been designed to stop the high beam power at the first momentum dispersive plane. A decay spectroscopy detection set-up or a low energy branch can be coupled to S3 for a wide range of studies.
Highlights
The second main feature of the reaction products is linked to their relatively low energy, from a few MeV/u, down to a few 10s of keV/u
This implies that they have a large angular as well as momentum distribution, due to the straggling in the target and from particle evaporation
- An upstream beam line leading to rotating targets that can sustain the high power beams either on stable or radioactive actinides
Summary
The superconducting linear accelerator of SPIRAL2 will be able to provide deuteron beams, and intense beams of heavy ions, from carbon to uranium, with energies from 2 to 14 MeV/u. Depending on ion source developments and the nature of the ion, currents up to 1mA could be reached, with a high transmission to the experimental areas and flexible beam energy. This opens new possibilities to study low cross-section reactions and their products. Additional details on the physics cases can be found in [1] and in the Letters of Intent for S3 [2] This program has strong synergies with the Atomic Physics community, in interaction studies in the unknown regime of fast ion-slow ion collisions.
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