A three-bump local orbit distortion method was applied to the SIS18 closed orbit (CO) correction. We report on several measurement campaigns on closed orbit measurement and correction carried out in February-May 2006. The details of closed orbit measurements and results of the correction are presented. 1 The SIS18 equipment for closed orbit measurement and correction The CO correction is important for machine operation. The better the CO is corrected, the less beam loss occurs during machine operation due to increase of the machine’s acceptance. CO errors are also relevant for feed down effects of multipoles, which may excite beam loss . The SIS18 has 12 periods and a nominal working point at injection energy with tunes (4.29; 3.29). There are 24 analog beam position monitors (BPMs): 12 in the horizontal and 12 in the vertical plane . The BPMs are placed in pairs (horizontal and vertical) in every period before the dipoles. The BPMs have separate pickup plates and allow independen
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