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Rao, T.

Paper Title Page
THPCH176 Deposition of Lead Thin Films Used as Photo-cathodes by Means of Cathodic Arc under UHV Conditions 3209
 
  • P. Strzyzewski, J. Langner, M. S. Sadowski, J. Witkowski
    The Andrzej Soltan Institute for Nuclear Studies, Centre Swierk, Swierk/Otwock
  • T. Rao, J. Smedley
    BNL, Upton, Long Island, New York
  • R. Russo, S. Tazzari
    Università di Roma II Tor Vergata, Roma
  • J.S. Sekutowicz
    DESY, Hamburg
 
  The cathodic arc technology has been used for various technical purposes for many years. Recently, it has been demonstrated that the cathodic arc can be operated under ultra-high vacuum (UHV) conditions and it might solve the problem of the oxygen contamination coming from water remnants. It opens a new road to many applications where very pure metallic and/or superconducting films are needed. The paper reports on recent experimental studies aimed on the deposition of superconducting films of pure lead (Pb) by means of the UHV cathodic arc. Such layers can be used as photo-cathodes needed for modern accelerator injectors. The system configuration, used for thin film deposition inside the RF Gun designed at DESY, is also described and the main results and characteristics of thin superconducting Pb-films are presented.  
THPLS092 Nb-Pb Superconducting RF-Gun 3493
 
  • J.S. Sekutowicz, J.I. Iversen, D. Klinke, D. Kostin, W.-D. Möller
    DESY, Hamburg
  • I. Ben-Zvi, A. Burrill, T. Rao, J. Smedley
    BNL, Upton, Long Island, New York
  • M. Ferrario
    INFN/LNF, Frascati (Roma)
  • P. Kneisel
    Jefferson Lab, Newport News, Virginia
  • K. Ko, L. Xiao
    SLAC, Menlo Park, California
  • J. Langner, P. Strzyzewski
    The Andrzej Soltan Institute for Nuclear Studies, Centre Swierk, Swierk/Otwock
  • R.S. Lefferts, A.R. Lipski
    SBUNSL, Stony Brook, New York
  • J.B. Rosenzweig
    UCLA, Los Angeles, California
  • K. Szalowski
    University of Lodz, Lodz
 
  We report on the status of an electron RF-gun made of two superconductors: niobium and lead. The presented design combines the advantages of the RF performance of bulk niobium superconducting cavities and the reasonably high quantum efficiency of lead, as compared to other superconducting metals. The concept, mentioned in a previous paper, follows the attractive approach of all niobium superconducting RF-gun as it has been proposed by the BNL group. Measured values of quantum efficiency for lead at various photon energies, analysis of recombination time of photon-broken Cooper pairs for lead and niobium, and preliminary cold test results are discussed in this paper.