DESIGN STUDY OF THE FRAGMENT RECOIL SEPARATOR ETNA

The secondary beam line ETNA (Exotics Transport to Nuclear Area) has b een designed at LNS to separate unstable nuclei produced in high-energ y heavy-ion reactions. The separation is performed according to the ma gnetic rigidity and energy loss in matter. Being a section of the extr action line of the Superconducting Cyclotron (K = 800), ETNA is suppos ed to work both as a beam transport line and as a fragment recoil sepa rator. Ion optical properties of ETNA have been optimized up to the se cond order. To have phase space distributions of ions in two focal pla nes of the separator Monte Carlo tests have been performed with the co de RAYTRACE. Angular and momentum stragglings in the degrader have bee n taken into account in the tests to obtain the expected beam profiles .