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PM24 Parasitic Bunch Measurement in e+/e- Storage Rings diagnostics, instrumentation, bunching, synchrotron-radiation, photon, undulator 149
 
  • M. Seebach, M. Werner
    DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
  • H. Franz, A. Ehnes
    DESY-HASYLAB, Deutsches Elektronen-Synchrotron, Hamburg, Germany
  The lepton storage rings DORIS and PETRA at DESY are used as sources for synchrotron radiation experiments. In normal operation the distance between the bunches should be 96 ns in PETRA and 192 ns in DORIS. The adjacent buckets must not have any stored particles or, in reality, as few as possible. This is particularly important for time triggered photon measuring experiments. The principle of the 'parasitic bunch' measurement down to a fraction of 10-6 of the main bunch within 20 seconds are described. Additionally, the sources of the 'parasitic bunches' and the actions to minimize them are discussed.