| Paper |
Title |
Page |
| MOPB015 |
Accelerator Module Repair for the European XFEL Installation |
82 |
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- E. Vogel, S. Barbanotti, F. Hoffmann, K. Jensch, D. Kostin, L. Lilje, W.-D. Möller, M. Schmökel, H. Weise
DESY, Hamburg, Germany
- S. Berry, O. Napoly
CEA/DSM/IRFU, France
- M. Sienkiewicz, J. Świerbleski, M. Wiencek
IFJ-PAN, Kraków, Poland
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Repair actions of different extent have been performed at 61 modules of the 100 accelerating series modules for the European XFEL to qualify them for the tunnel installation. Four modules could not be repaired in time. CEA Saclay managed to perform three major repairs in parallel to the series module integration, the residual repair actions took place at DESY Hamburg. In this paper we will give an overview on the various technical problems which required being fixed before the tunnel installation and on the repair actions performed.
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Poster MOPB015 [9.354 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-SRF2017-MOPB015
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| MOPB088 |
Experience on In-situ Module Repair and Set Up of Non XFEL Cavity Strings at DESY |
269 |
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- M. Schmökel, A. Daniel, N. Krupka, A. Matheisen, S. Saegebarth, M. Schalwat, P. Schilling
DESY, Hamburg, Germany
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All components installed to the European XFEL cavity string modules underwent an intensive inspection and quality control before acceptance for installation to cavities or modules. Even though some RF feed throughs for HOM coupler- and Pick Up antennas showed leaks at the ceramic insulation after module test at 2 K. Due to time restriction and continuity of production the exchange of these parts needed to be done without reentering the cleanroom. Successful repair of these modules took place by setting up a local cleanroom onto the cavity string. In collaboration with Helmholtz-Zentrum Dresden-Rossendorf (HZDR), a cavity string for the ELBE project was assembled at DESY and transported to HZDR for installation to the vacuum vessel. A spare module with 3.9 GHz Resonators for the European XFEL was set up at DESY and will be tested and qualified for the European XFEL. Due to delay in delivery of the power couplers, four power couplers were installed after string assembly.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-SRF2017-MOPB088
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| TUPB075 |
Vertical Electro Polishing of Superconducting Single-and Multi Cell Gun Resonators |
571 |
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- N. Steinhau-Kühl, R. Bandelmann, A. Matheisen, S. Saegebarth, M. Schmökel
DESY, Hamburg, Germany
- A. Arnold
HZDR, Dresden, Germany
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At DESY activities on surface treatment of superconducting RF gun cavity resonators at 1.3 GHz are ongoing. Due to the small opening on the endplate for insertion of cathodes, no reasonable acid flow can be realized with the existing set up for horizontal electro polishing. To benefit from electro polishing of Niobium surfaces, an adapter to the existing horizontal electro polishing bench at DESY was set up and is in operation now. Vertical EP was applied on 1.3 GHz SRF gun resonators with 1.6 and 3.5 cell geometry. Work flow, process conditions as well as test results of gun cavities treated so far at DESY are described.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-SRF2017-TUPB075
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