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Reschke, D.

Paper Title Page
THP013 Various Applications of Dry-Ice Cleaning in the Field of Accelerator Components at DESY 803
  • A. Brinkmann, D. Reschke, J. Ziegler
    DESY, Hamburg

Funding: We acknowledge the support of the European Community Research Infrastructure Activity under FP6 'Structuring the European Research Area' program (CARE, contract number RII-CT-2003-506395
Dry-Ice cleaning offers a dry and waterless cleaning option removing hydrocarbons and particles without residues. Complex excavations like Cu rf gun cavities and Nb multicell cavities in horizontal installation position can be cleaned in an effective way. In the recent past rf gun cathodes and cathode transportboxes could be cleaned satisfactory. A status report will be given.

THP014 Recent Results of 1.3 GHz Nine-Cell Superconducting Cavities for the European XFEL 806
  • L. Lilje, D. Reschke
    DESY, Hamburg

In preparation for the series production of roughly 800 superconducting accelerating structures, several tests with an industrial-like production sequence have been tested for their accelerating gradient and quality factor. The main part of the surface preparation is being done with electropolishing. with ethanol rinse. For the two different final preparation steps namely electropolishing and etching the performance is compared. The results will be also put into the perspective of earlier cavity production cycles that were tested at DESY.

THP015 Open 120C Bake in Argon Atmosphere: A Simplified Approach for Q-Drop Removal 809
  • D. Reschke, J. Ziegler
    DESY, Hamburg

The removal of the Q-drop without field emission by a low temperature (app. 120C) bake procedure is essential in order to achieve the full performance in both electropolished (EP) and chemically etched (BCP) high gradient SCRF Nb accelerator cavities. A simplified procedure applying an open 120C bake out in an Argon atmosphere is presented. First results are compared to the well-established bake-out procedure under vacuum conditions.

THP016 Analysis of Quenches Using Temperature Mapping in 1.3 GHz SCRF Cavities at DESY 812
  • D. Reschke
    DESY, Hamburg

The local thermal breakdown (quench) behavior of one- and nine-cell SCRF Nb accelerator cavities is investigated systematically. For more than 50 cavities, temperature mapping data have been analyzed with respect to surface preparation, Nb material etc. Results on quench location and characteristic correlations are presented.