Author: Chorniy, O.
Paper Title Page
WEPF31 A FESA DAQ for Fast Current Transformer in SIS 18 894
  • O. Chorniy, H. Bräuning, T. Hoffmann, H. Reeg, A. Reiter
    GSI, Darmstadt, Germany
  This contribution presents the development of the data acquisition (DAQ) system for the readout of fast beam current transformers (FCT) as installed in the GSI synchrotron SIS18 and as foreseen in several FAIR ring accelerators. Fast current transformers are reliable devices that offer a large analogue bandwidth and can therefore monitor bunch structures with high resolution. At appropriate sampling rates continuous measurements throughout repeated machine cycles lead to a large amount of raw data. The analysis of those raw data may range from simple bunch parameter calculations to complex longitudinal phase space reconstructions. Consequently, a new DAQ system must be carefully designed to allow for flexible acquisition modes or to allow for data reduction methods in special applications. The aims of the development are discussed and the status of the new DAQ is presented.  
poster icon Poster WEPF31 [2.307 MB]  
THAL1 Understanding the Tune Spectrum of High Intensity Beams 914
  • R. Singh, O. Chorniy, P. Forck, R. Haseitl, W. Kaufmann, P. Kowina, K. Lang
    GSI, Darmstadt, Germany
  • R. Singh
    TEMF, TU Darmstadt, Darmstadt, Germany
  Tune spectra measurements are routinely performed in most synchrotrons. At high intensity and low energies (i.e. γ≈1), space charge effects can significantly modify the tune spectra in comparison to the classical low intensity spectra. Systematic studies were performed at GSI SIS-18 to observe these characteristic modifications, mainly resulting from the shift of the head-tail modes in direct dependence of beam intensity and synchrotron tune frequency. In this contribution, an interpretation of the tune spectra modification based on quasi-analytical models and numerical simulations will be presented. Extraction of elusive beam parameters such as incoherent tune shift, machine impedances, chromaticity, etc. from the spectra will be demonstrated. Further, the applications and relevance of these results for other synchrotrons will be discussed.  
slides icon Slides THAL1 [3.807 MB]