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| MOPB003 |
A New High Resolution Optical System for Inspection of Gun-and Multi-cell Resonators in ISO-4 Cleanrooms |
ion, cavity, SRF, MMI |
47 |
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- M. Schalwat, R. Bandelmann, A. Daniel, N. Krupka, A. Matheisen, S.T. Sievers
DESY, Hamburg, Germany
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Optical inspection of the inner surface of superconducting resonators was established during European XFEL cavity production by usage of the so called OBACHT optical inspection. In addition to the surface inspection by OBACHT a new optical inspection system with integrated high resolution camera is set up at DESY. It allows inspection of multi-cell resonators as well as gun cavity resonators with only single side accessibility to the inner surface. A prototype was commissioned and optical inspections were done with OBACHT and the new system in parallel. Two SRF gun cavities were inspected by this optical system and origin of limitations of the resonators were identified.
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Poster MOPB003 [0.220 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-SRF2017-MOPB003
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| TUPB075 |
Vertical Electro Polishing of Superconducting Single-and Multi Cell Gun Resonators |
cavity, ion, SRF, cathode |
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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| THPB076 |
Carbon-based Coatings for Electron Cloud Mitigation in SRF Photocathodes |
ion, SRF, cathode, electron |
910 |
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- M. Vogel, X. Jiang, C. Schlemper
University Siegen, Siegen, Germany
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Funding: This research has been funded by the Federal Ministry of Education and Research of Germany in the framework of HOPE I (project number 05K13PS2).
During the past three years, we developed a coating along with a corresponding in-situ characterization process in order to realize SRF-gun surfaces featuring low secondary electron yield (SEY). Important aspects that have been accounted for are the homogeneity and adhesion of the coatings deposited on the cylindrical SRF-gun mantle. Furthermore, the correlation between SEY and crystallinity, morphology, and contamination was studied in detail. The SEY maximum can be tuned between 1.5 and less than 0.7 depending on the deposition conditions. In this work, we recap the results and present a general strategy for the effective mitigation of electron cloud multiplication.
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Poster THPB076 [5.583 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-SRF2017-THPB076
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| Export • |
reference for this paper using
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