HIGH-FLUX AND HIGH-RESOLUTION SPECTROSCOPIC FACILITY IN THE VUV REGION AT SUPER-ACO

A new spectroscopic facility, consisting of a planar/helical undulator and a 6.65 m off-plane Eagle monochromator, has been designed. It can supply high-flux and high-resolution photons with 'exotic' polarizati on in the 5-40 eV energy range. The astigmatism can be compromised by horizontally focusing the incident radiation on the grating. The rotat ion of a post-focusing toroidal mirror compensates for the deviation o f the exit beam caused by the grating translation. The whole system wi ll be installed at beamline SU5 of SUPER-AGO (0.8 GeV) at the beginnin g of 1998. With a 4300 grooves mm(-1) grating, a resolving power of ar ound 10(5) is expected at 20 eV.