Publications
Publication Information
| Title | Shape Evolution of C75 Large-Grain Nb Half-Cells During Cavity Fabrication | ||
| Authors | Gianluigi Ciovati | ||
| JLAB number | JLAB-ACC-21-3432 | ||
| LANL number | (None) | ||
| Other number | DOE/OR/23177-5247 | ||
| Document Type(s) | (Meeting) | ||
| Category: | SRF Technology |
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| Associated with EIC: | No | ||
| Supported by Jefferson Lab LDRD Funding: | No | ||
| Funding Source: | Nuclear Physics (NP) | ||
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Meeting Poster compiled for SRF 2021 Proceedings SRF2021 Edited By Kenji Saito, Ting Xu, Naruhiko Sakamoto, Ana Lesage, Volker RW Schaa JACOW (2021) | |||
| Publication Abstract: | The largely anisotropic deformation of large-grain Nb discs during deep drawing into half-cells poses a challenge for achieving a desired shape accuracy. Two 5-cell cavities for the C75 CEBAF cryomodule rework program have been fabricated at Jefferson Lab from large-grain Nb discs directly sliced from an ingot. The shape of the inner surface of eight half-cells has been inspected using a FARO Edge laser scanner during the fabrication process and compared to the reference shape. On average, approximately 63% of the half-cell inner surface was found to be within 0.1 mm of the reference shape and ~90% to be within 0.2 mm, after the final equator machining. Several 5-cell C75 cavities have also been fabricated at Research Instruments, Germany, and measurements of the shape accuracy using a Zeiss 3D coordinate measuring machine gave similar results. One half-cell was measured both at Research Instruments and Jefferson Lab for comparison. | ||
| Experiment Numbers: | other | ||
| Group: | SRF Research & Dev | ||
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