Design study of magnetic environments for XYZ polarization analysis   using 3He for the new thermal time of flight spectrometer TOPAS
  We present a finite element calculation of the magnetic field (MagNet software) taken with the newly proposed PASTIS Coil, which uses a wide-angle banana shaped 3He Neuton Spin Filter cell (NSF) to cover a large range of scattering angle. The goal of this insert is to enable XYZ polarization analysis to be installed on the future thermal time-of flight spectrometer TOPAS. 
Zahir Salhi, Earl Babcock, Alexander Ioffe
physics.ins-det nucl-ex