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Pagani, C.

Paper Title Page
WEPMN020 Improved Design of the ILC Blade-Tuner for Large Scale Production 2089
  • C. Pagani, A. Bosotti, N. Panzeri
    INFN/LASA, Segrate (MI)
  The ILC superconducting linacs ask for the use of a compact and cost effective tuner design with no interference with the cavity end group area. The integration of the piezo-assisted fast tuning option made the Blade-Tuner, successfully tested at DESY on the superstructures, the most viable candidate to be included into the ILC BCD. In the perspective of large scale production and on the basis of the experience acquired so far, two alternative prototypes have been recently designed and built. They mainly differ for the materials adopted (titanium or stainless steel) and have been optimized to minimize material and construction cost, while fulfilling the reviewed performances required for the high gradient cavity operation up to 35 MV/m or even higher. In this paper we discuss the rationales that brought us to the current solutions, together with a critical comparison of the two systems behavior and cost.  
WEPMN021 High Pressure Rinsing System Comparison 2092
  • D. Sertore, M. Fusetti, P. Michelato, C. Pagani
    INFN/LASA, Segrate (MI)
  • G. Ciovati, T. M. Rothgeb
    Jefferson Lab, Newport News, Virginia
  • T. Higo, J. H. Hong, K. Saito
    KEK, Ibaraki
  High pressure rinsing (HPR) is a key process for the surface preparation of high field superconducting cavities. A portable apparatus for the water jet characterization, based on the transferred momentum between the water jet and a load cell, has been used in different laboratories. This apparatus allows to collected quantitative parameters that characterize the HPR water jet. In this paper, we present a quantitative comparison of the different water jet produced by various nozzles routinely used in different laboratories for the HPR process  
THPMN024 A Study for the Characterization of High QE Photocathodes 2760
  • D. Sertore, P. Michelato, L. Monaco, C. Pagani
    INFN/LASA, Segrate (MI)
  Funding: Work supported by the European Community, contract number RII3-CT-2004-506008

Based on our experience on photocathode production, we present in this paper the results of the application of different optical diagnostic techniques on fresh and used photocathodes. These techniques allow to study effects like non uniformity, cathode aging, etc. In particular, photocathode optical parameters and QE characterization, both done at different wavelengths, give fundamentals information for the construction of a model of the photoemission process to be applied to Cs2Te photocathodes. These studies are useful for further improving key cathode features, such as its robustness and lifetime as well as to study and control the photocathodes thermal emittance.

THPMN025 High QE Photocathodes Performance during Operation at FLASH/PITZ Photoinjectors 2763
  • L. Monaco, P. Michelato, C. Pagani, D. Sertore
    INFN/LASA, Segrate (MI)
  • J. W. Baehr, M. Krasilnikov, S. Lederer, F. Stephan
    DESY Zeuthen, Zeuthen
  • J. H. Han, S. Schreiber
    DESY, Hamburg
  Funding: Work supported by the European Community, contract number RII3-CT-2004-506008

The FLASH (DESY-Hamburg) and PITZ (DESY-Zeuthen) photoinjectors routinely use high quantum efficiency (QE) photocathodes produced at LASA (INFN-Milano), since 1998. To further understand the photocathode behavior during beam operation, photocathode QE measurements have been performed at different operating conditions in both RF photoinjectors. The analysis of these measurements will be used to improve the photocathode preparation procedures and to deeper understand the photocathode properties, whose final goal would be the further increase of their lifetime and beam quality preservation during the RF gun operations.

TUPMN026 Conditioning of a New Gun Cavity Towards 60 MV/m at PITZ 971
  • S. Lederer, G. Asova, J. W. Baehr, C. H. Boulware, H.-J. Grabosch, M. Hanel, S. Khodyachykh, S. A. Korepanov, M. Krasilnikov, B. Petrosyan, S. Rimjaem, T. A. Scholz, L. Staykov, F. Stephan
    DESY Zeuthen, Zeuthen
  • K. Boyanov
    INRNE, Sofia
  • L. H. Hakobyan
    YerPhI, Yerevan
  • P. Michelato, L. Monaco, C. Pagani, D. Sertore
    INFN/LASA, Segrate (MI)
  • R. Richter
    BESSY GmbH, Berlin
  • J. Roensch
    Uni HH, Hamburg
  Funding: This work has partly been supported by the European Community, contracts RII3-CT-2004-506008 and 011935, and by the 'Impuls- und Vernetzungsfonds' of the Helmholtz Association, contract VH-FZ-005.

Beginning 2007, a new gun cavity will be installed at the photo injector test facility at DESY in Zeuthen (PITZ). It will be conditioned towards gradients as high as 60 MV/m. This gradient is required for the operation of the European XFEL. Results from the conditioning for high peak power and high duty cycle will be reported.