• D. Boutin, M. Authier, F. Dechery, O. Delferrière, A. Drouart, J. Payet, D. Uriot
  CEA, Gif-sur-Yvette
• M. Amthor, H. Savajols, M.-H. Stodel
  GANIL, Caen
• S.L. Manikonda, J.A. Nolen
  ANL, Argonne

S3 (Super Sep­a­ra­tor Spec­trom­e­ter) [1] is a fu­ture de­vice de­signed for ex­per­i­ments with the high in­ten­si­ty heavy ion sta­ble beams of SPI­RAL2 [2] at GANIL (Caen, France). It will in­clude a tar­get re­sis­tant to these very high in­ten­si­ties, a first stage mo­men­tum achro­mat for pri­ma­ry beam ex­trac­tion and sup­pres­sion, a sec­ond stage mass spec­trom­e­ter and a ded­i­cat­ed de­tec­tion sys­tem. This spec­trom­e­ter in­cludes large aper­ture quadrupole triplets with em­bed­ded mul­ti­po­lar cor­rec­tions. To en­able the pri­ma­ry beam ex­trac­tion one triplet has to be opened on one side, which re­quires an ap­pro­pri­ate de­sign of such a mul­ti­po­lar mag­net. The final mass sep­a­ra­tion power re­quired for S3 needs a care­ful de­sign of the op­tics with a high level of aber­ra­tion cor­rec­tion. Mul­ti­ple sym­met­ric lat­tices were stud­ied for this pur­pose. A 4-fold sym­met­ric lat­tice and the achieved re­sults are de­scribed in this paper.

[1] A. Drouart et al., Nucl. Phys. A 834 (2010) 747c. [2] SPIRAL2, http://pro.ganil-spiral2.eu/spiral2