The S800 Spectrograph.

The high resolution S800 spectrograph built at the National Superconducting Cyclotron Laboratory (NSCL) is specially designed for reactions studies with radioactive beams. Its large acceptances both in solid angle and momentum are well adapted to the large emittances of secondary beams produced by projectile fragmentation. The high resolution is achieved via an analytical reconstruction method in which the aberrations of the spectrograph are calculated a priori from the magnetic field maps and used directly to correct the raw data. Following the coupled cyclotron upgrade now completed at the NSCL, the S800 has undergone a number of improvements. An overview of past and future experiments is also presented. (C) 2003 Elsevier Science B.V. All rights reserved.