Author: Monaco, L.
Paper Title Page
WEPWO011 In-vacuum Temperature Measurement of Niobium Components using Infrared Pyrometry during Electron Beam Welding Procedure 2334
  • L. Monaco, P. Michelato, C. Pagani, D. Sertore
    INFN/LASA, Segrate (MI), Italy
  • V. Battista, G. Corniani, M. Festa
    Ettore Zanon S.p.A., Schio, Italy
  Electron beam welding (EBW) is widely used in the construction of Niobium Superconducting RF cavities. The welding sequence of such a complex structure, foresees many welding operations. The welding parameters depend on many variables as the material thickness, but also on the component temperature before each weld. This paper presents a technique to measure the temperature of Nb components in vacuum during the EBW operation using an IR pyrometer placed outside the vacuum chamber through an appropriate vacuum viewport. With the current configuration the system can measure temperatures up to 350°C in the vacuum conditions of the EBW vacuum chamber (10-5-10-6 mbar). The technique was used to optimize the time interval between each subsequent equatorial weld operation during Nb cavities production at Ettore Zanon, increasing the welding procedure reliability and decreasing the waiting time by control of the temperatures in the weld region. Moreover this technique can be generally used for in vacuum measurements of components from room temperature up to about 350 °C. Future developments are under way to make this technique compatible with UHV and increasing the measurement range.  
WEPWO012 XFEL 3.9 GHz Prototype Cavities Tests 2337
  • P. Pierini, M. Bertucci, A. Bosotti, C. Maiano, P. Michelato, L. Monaco, R. Paparella, D. Sertore
    INFN/LASA, Segrate (MI), Italy
  • E.R. Harms
    Fermilab, Batavia, USA
  • C. Pagani
    Università degli Studi di Milano & INFN, Segrate, Italy
  • E. Vogel
    DESY, Hamburg, Germany
  In preparation for the XFEL components production, three prototype cavities have been manufactured and vertically tested at INFN-LASA. Several tests, with and without HOM antennas and in a double cavity test configuration, have been performed. Further tests of one of the prototypes took place at FNAL, to validate results between the two test facilities. Results were consistent with those obtained at INFN-LASA.