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Langlois, M. L.

Paper Title Page
MOPD033 The ALBA RF Amplifier System Based on Inductive Output Tubes (IOT) 523
 
  • P. Sanchez, D. Einfeld, M. L. Langlois, F. Pérez
    ALBA, Bellaterra
  • J. Alex, A. Spichiger, J. Stahl
    Thomson Broadcast & Multimedia AG, Turgi
  • C. Bel, G. Peillex-Delphe, P. Ponard
    TED, Thonon
 
  The ALBA accelerator RF systems include a complete new transmitter developed in collaboration between Thomson Broadcast & Multimedia (TBM), Thales Electron Devices (TED) and CELLS. A new IOT version, based on the previous TH793 has been developed by TED: the TH793-1, dedicated to scientific applications. It has demonstrated cw operation up to 90 kW at 500 MHz. In addition, a TH18973 LS cavity has also been developed, featuring a 6”1/8 coaxial RF output, an optimized cooling system and centred operation at 500 MHz, 7 MHz bandwidth and ± 5 MHz tuning range. TBM developed a new amplifier system to achieve high reliability and performance. Each IOT is powered by an individual power supply based on the Pulse Step Modulator technology. The amplifier control system was designed on a PLC controller with the possibility to interface with the Tango control system. The first amplifier was delivered to ALBA in summer 2007 and is already in use for the conditioning and testing of the first RF cavity. The remaining 13 amplifiers will be delivered in the second half of 2008. The paper gives an overview on the design and operation performance during commissioning and cavity testing.  
MOPP097 Measurements on the Rf Cavity for the ALBA Storage Ring 781
 
  • M. L. Langlois, M. Cornelis, F. Pérez, P. Sanchez
    ALBA, Bellaterra
 
  ALBA storage ring will use 6 ambient temperature nose cone HOM damped cavities tuned at 500 MHz, designed at BESSY and known as the EU cavity. A first one, manufactured by ACCEL, was delivered in 2007 to investigate on its behaviour. This paper describes the data collected during investigation. First, bead-pull measurements were performed to assess impedance, both on fundamental and high order modes. Emphasis was put on E011, due to the discrepancy between expected values and results for this mode. The vacuum bake-out and related pressure are shown. Then, the cavity was conditioned and observations were made on multipacting levels, conditioning time and surface temperatures. The latter were found inhomogeneous and leads are detailed to avoid local overheating.