TEARES: Toroidal Energy- and Angle-Resolved Electron Spectrometer: Results and Progress to Date

In order to keep up with the large improvements in synchrotron radiation, we have developed a toroidal-based electron spectrometer capable of collecting electrons emitted over a large angular range, whilst preserving emission direction information. This system has an analyser defined by spherical radius of 125 mm, cylindrical radius of 120 mm, sector angle of 142 deg , and useable azimuthal angle of ~230 deg . A 1 mm high analyser entrance slit provides a theoretical analyser resolution (E/PE) of 0.0081. The spectrometer has no blind spots and incorporates a working distance defined by a ~40 mm radius. It operates over the kinetic energy range < 0.5 to 1000 eV and a pass energy range of ~0.5 to 25 eV. This system represents an enormous advance over other more typical spectrometers, (e.g. hemispherical), as the solid acceptance angle is up to two orders of magnitude greater.