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Monaco, L.

Paper Title Page
MOPC072 Photocathode Studies at FLASH 232
 
  • S. Lederer, S. Schreiber
    DESY, Hamburg
  • J. H. Han
    Diamond, Oxfordshire
  • P. M. Michelato, L. Monaco, C. Pagani, D. Sertore
    INFN/LASA, Segrate (MI)
  
  Since several years, the DESY photoinjectors at FLASH and PITZ use cesium telluride photocathodes. One concern of operating an electron source with these cathodes is the degradation of the quantum efficiency (QE), starting from about 10 % to below 0.5 % during operation. To further understand this behavior the QE is monitored routinely. In this paper recent results from photocathode studies at FLASH are presented.  
MOPC075 Cs2Te Photocathode Robustness Studies 241
 
  • D. Sertore, P. M. Michelato, L. Monaco, C. Pagani
    INFN/LASA, Segrate (MI)
  • S. Lederer, S. Schreiber
    DESY, Hamburg
  • F. Stephan
    DESY Zeuthen, Zeuthen
  
  Cs2Te photocathodes are used as laser driven electron sources at FLASH and PITZ. Besides many aspects of their performances, their robustness to gas exposition and the effect of pollutants on photocathode properties, and indirectly on the photoemitted electrons, are a field still rather unexplored. In this article we present the results of controlled exposition of Cs2Te photocathodes to gases typical present in the UHV environment of an RF Gun with respect to spectral response (QE vs. wavelength), and QE uniformity. Moreover, a comparison between polluted cathodes and fresh ones during operation in an RF Gun is presented.  
MOPP148 Design of a Magnetic Shield Internal to the Helium Vessel of SRF Cavities 898
 
  • P. Pierini, S. Barbanotti, L. Monaco, N. Panzeri
    INFN/LASA, Segrate (MI)
  
  The TRASCO elliptical cavities for intermediate velocity protons (β=0.47) employ a coaxial cold tuner of the blade type. To meet the perfomance goals of the 700 MHz cavities in the foreseen horizontal cryostat tests, the cavities are being equipped with a magnetic shield which lies internally to the cavity helium vessel and has a simple mechanical design and assembly procedure.