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- M. Seebach, M. Werner
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
- H. Franz, A. Ehnes
DESY-HASYLAB, Deutsches Elektronen-Synchrotron, Hamburg, Germany
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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.
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