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bunching

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PM24 Parasitic Bunch Measurement in e+/e- Storage Rings diagnostics, instrumentation, synchrotron-radiation, photon, lepton, 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.  
 
PT24 Development of a Bunch-Length Monitor with Sub-Picosecond Time Resolution and Single-Shot Capability
Funding: SNF (Schweizer National Fonds) 		diagnostics, instrumentation, linac, electron, SLS 228
 
  • D. Sütterlin, V. Schlott, H. Sigg
    PSI, Paul Scherrer Institut, Villigen, Switzerland
  • H. Jackel
    ETHZ, Institute of Electronics, Zürich, Switzerland
  A bunch-length monitor with single-shot capability is under development at the 100 MeV pre-injector LINAC of the Swiss Light Source (SLS). It is based on the electro-optical effect in a ZnTe crystal induced by coherent transition radiation (CTR). A spatial autocorrelation of the CTR in the EO-crystal rotates the polarisation of a mode-locked Nd:YAG laser to produce an image on an array detector representing the Fourier components of the CTR spectrum. Up to now a theoretical model for the emission of transition radiation has been developed in order to design optics allowing efficient transport of the CTR onto the EO-crystal. The frequency dependency of the CTR due to the finite size of the target screen has been measured in the sub-THz regime at the SLS Linac. The results strongly support the theoretical descriptions of the radiation source. By expanding the intensity pattern in higher-order Laguerre-Gaussian modes, the transmission through the optical transfer system is calculated.