The SOLARIS spectrometer

SOLARIS is a dual-mode solenoidal spectrometer for the reaccelerated (ReA) beam facility at the National Superconducting Cyclotron Laboratory (NSCL), and subsequently the Facility for Rare Isotope Beams (FRIB). The design is optimized for the study of a broad range of transfer and inelastic-scattering reactions at incident beam energies around the Coulomb barrier with good Q-value resolution and efficiency. In one mode of operation, SOLARIS will support an on-axis Si array, like the HELIOS spectrometer at Argonne National Laboratory, primarily for reaction measurements with beam intensities greater than 10⁴ particles per second. In the other mode, the NSCL Active Target Time Projection Chamber (AT-TPC) will occupy the bore of the solenoid, taking advantage of the up to 4-T field. An overview of SOLARIS, the planned implementation of SOLARIS on the ReA6 beamline, and physics opportunities will be presented.