Author: Martins, C.A.
Paper Title Page
THPMW027 Development of a Long Pulse High Power Klystron Modulator for the ESS Linac based on the Stacked Multi-level Topology 3600
  • C.A. Martins
    ESS, Lund, Sweden
  • M. Collins, A. Reinap
    Lund Technical University, Lund, Sweden
  A novel Stacked Multi-Level modulator topology optimized for long pulse and high average power applications has been developed at ESS. It utilizes six identical modules connected in series at the HV output side and fed in parallel from the low voltage side. Each one is formed by one HF inverter, one step-up transformer, one HV rectifier bridge and one HV passive filter. They are supplied in groups of two from three capacitor banks which in turn will be charged from the low voltage electrical grid by using three groups of active AC/DC and DC/DC converters. Industrial standard power electronic components are used at the primary stage, which are placed in conventional electrical cabinets. Only few special components (transformers, rectifiers, filters) are required to be placed in an oil tank. A technology demonstrator rated for 115kV/20A and 3.5ms/14Hz is at the final phase of construction. The main power conversion circuit and regulation principles will be described and details on the design and construction of the main sub-systems will be given. Simulation and experimental results will be given showing the achieved performance in terms of HV pulse quality and AC grid power quality  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW027  
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FRYAA02 ESS Progressing into Construction 4266
  • M. Lindroos, H. Danared, M. Eshraqi, R. Garoby, A. Jansson, Y.I. Levinsen, C.A. Martins, A. Ponton
    ESS, Lund, Sweden
  The construction of the European Spallation Source, ESS, started in summer 2014. At the site in Lund, the accelerator tunnel will be completed at the time of IPAC16, while prototyping and manufacturing or prepara-tions for manpower contributions are going on in more 23 laboratories distributed over the 12 European countries collaborating on the accelerator project. Major technical milestones have been reached include the testing of su-perconducting cavity prototypes of two families to values above design gradients, the first ESS modulator has been tested to 90 kV and the first klystron prototype has been received in April 2016. Equally important developments are taking place at many partner laboratories. The presen-tation will summarize the status of the ESS accelerator project by the time of IPAC16..  
slides icon Slides FRYAA02 [66.734 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-FRYAA02  
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