| Paper |
Title |
Page |
| MOPLR037 |
Study of the Surface and Performance of Single-Cell Nb Cavities After Vertical EP Using Ninja Cathodes |
217 |
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- V. Chouhan, Y.I. Ida, K.N. Nii, T.Y. Yamaguchi
MGH, Hyogo-ken, Japan
- P. Carbonnier, F. Éozénou, Y. Gasser, L. Maurice, C. Servouin
CEA/DSM/IRFU, France
- F. Furuta, M. Ge, T. Gruber, J.J. Kaufman, J. Sears
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
- H. Hayano, S. Kato, H. Monjushiro, T. Saeki, M. Sawabe
KEK, Ibaraki, Japan
- K. Ishimi
MGI, Chiba, Japan
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A 1.3 GHz single-cell niobium (Nb) coupon cavity was vertically electropolished (VEPed) with three different Ninja cathodes which were specially designed for VEP of 1.3 GHz superconducting RF elliptical (ILC/Tesla type) cavities. The cathodes were fabricated to have different surface areas and different distances between cathode surface and the equator. The Ninja cathode prepared with an enhanced cathode surface area was covered with a meshed shield to avoid bubble attack on the surface of the cavity cell. It has been turned out that the anode-cathode distance and the cathode area affect surface morphology of the equator. A smooth equator surface was obtained in the cases in which the cathode surface was geometrically close to the equator or instead the cathode surface area was sufficiently larger. Two 1.3 GHz ILC/Tesla type single-cell cavities VEPed with the Ninja cathodes and using optimized conditions showed good performance in vertical tests.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR037
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| TUP106006 |
Vertical Test Results on ESS Medium Beta Elliptical Cavity Prototype |
631 |
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- E. Cenni
CEA/IRFU, Gif-sur-Yvette, France
- S. Berry, P. Bosland, F. Éozénou, L. Maurice, J. Plouin, C. Servouin
CEA/DSM/IRFU, France
- G. Costanza
Lund University, Lund, Sweden
- C. Darve
ESS, Lund, Sweden
- G. Devanz, X. Hanus, F. Peauger, D. Roudier
CEA/DRF/IRFU, Gif-sur-Yvette, France
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The ESS elliptical superconducting Linac consists of two types of 704.42 MHz cavities, medium and high beta, to accelerate the beam from 216 MeV (spoke cavity Linac) up to the final energy at 2 GeV. The last Linac optimization, called Optimus+ [1], has been carried out taking into account the limitations of SRF cavity performance (field emission). The medium and high-beta parts of the Linac are composed of 36 and 84 elliptical cavities, with geometrical beta values of 0.67 and 0.86 respectively. This work presents the latest vertical test results on ESS medium beta elliptical cavity prototypes. We describe the cavity preparation procedure from buffer chemical polishing to vertical test. Finally magnetic probes (Fluxgate) were installed on the cavity to determine magnetic field background during vertical test. The latest vertical test results showed that our cavity design performance are beyond requirements.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106006
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| Export • |
reference for this paper using
※ BibTeX,
※ LaTeX,
※ Text/Word,
※ RIS,
※ EndNote (xml)
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