The Argon Cluster Beam Installed In The Adone Storage Ring

The argon cluster beam, with a maximum thickness of 1.5 x 10(14) atoms/cm2, installed at Frascati on the ADONE storage ring, is described. The cluster beam works at room temperature and is used as radiator to produce an intense tagged photon beam with energy up to 1.2 GeV. The argon beam properties were measured using electrons stored in ADONE; the results are in good agreement with the expected values. The apparatus can produce cluster beams of higher thickness and work with different gases. It is suitable for internal target experiments with the 1.5 GeV stored electrons.