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Müller, I.

Paper Title Page
TPPB37 Status of the MLS Control System 241
  • T. Birke, R. Daum, S. Ehlert, D. Faulbaum, B. Franksen, R. Hartmann, B. Kuner, P. Laux, I. Müller, R. Müller, G. Pfeiffer, H. Rüdiger, J. Rahn, D. Thorn, R. Lange
    BESSY GmbH, Berlin
  The Physikalisch-Technische Bundesanstalt (PTB), the German national metrology institute, has set up in close cooperation with BESSY a low-energy electron storage ring next to the BESSY II site. The new storage ring, named "Metrology Light Source"(MLS), is mainly dedicated to metrology and technological developments in the UV and VUV spectral range. Its commissioning started in March 2007. The MLS control system is based on the Experimental Physics and Industrial Control System (EPICS) toolkit. Design and implementation choices guided by the experiences with the BESSY II control system have been flanked by other techniques and new approaches where needed and appropriate. The presentation introduces the MLS and discusses design and implementation of its control system.  
WPPB36 Ripple Diagnostic on BESSY II Power Supplies 466
  • T. Birke, T. Schneegans, I. Müller
    BESSY GmbH, Berlin
  Keeping the ripple of power-supply currents within the specification limits is crucial for the beam stability of the BESSY storage ring. Malfunctioning or aged electronic devices cause an increase of output ripple over the years. This increase is hardly noticed by the operator or operation analysis because the slow integrating AD converters for the current readbacks filter out the ripple. Furthermore, it is almost impossible to find the connection between certain beam movements or beam noise and the faulty power supply causing it. To improve this situation, ripple information for every power supply is required within the control system. The latest series of the CAN bus-connected power-supply interface cards used at BESSY provide an additional fast AD converter. With a sampling frequency of 83.5kHz, this ADC samples ripple information over one period of the mains voltage. The results are transferred over the CAN bus to the EPICS-based control system and can be processed in the usual ways. Using this setup, even temporarily increased ripple can be detected without complex measurement methods.