• R. Müller, B. Franksen, R. Görgen, R. Lange, I. Müller, J. Rahn, T. Schneegans
  Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Elektronen-Speicherring BESSY II, Berlin
• P. Kuske
  Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin

In view of in­creased pro­cess­ing band­width at de­mand­ing ex­per­i­ments and the need for rapid com­pen­sa­tion of noise spikes and new, yet un­known ex­ci­ta­tions a fast orbit feed­back aim­ing at noise sup­pres­sion in the 1Hz-50Hz range has be­come manda­to­ry for the 3rd gen­er­a­tion light source BESSY II. As a first step the fast set­point trans­mis­sion plus the re­place­ment of all cor­rec­tor power sup­plies is fore­seen. Later - in com­bi­na­tion with top-up op­er­a­tion - orbit sta­bil­i­ty can be fur­ther im­proved by re­plac­ing today's mul­ti­plexed ana­log beam po­si­tion mon­i­tors by par­al­lel pro­cess­ing fast dig­i­tal units. This paper de­scribes how the pilot in­stal­la­tion of a small sub­set of fast cor­rec­tor power sup­plies al­ready al­lows to tune per­for­mance and study the ben­e­fits for today's most sen­si­ble ex­per­i­ments.