Document Type

Conference Paper

Publication Date

2024

DOI

10.18429/JACoW-IPAC2024-MOPC55

Publication Title

Proceedings of the 15th International Particle Accelerator Conference

Pages

188-191

Conference Name

15th International Particle Accelerator Conference, May 19-24, 2024, Nashville, TN

Abstract

The program to upgrade CEBAF cryomodules has been implemented to enhance the energy gain of refurbished cryomodules up to 75 MeV. This strategy in-volves reusing the waveguide end-groups from original CEBAF cavities produced in the 1990s, and existing five elliptical cell cavities are replaced with a new optimized cell shape cavity constructed from large-grain, ingot Nb material. Following fabrication, each cavity undergoes centrifugal barrel polishing and electropolishing and is tested at 2.07 K. Eight cavities are then assembled into "cavity pairs" and tested at 2.07 K before integration into the cryomodule. This paper presents the outcomes of the cavity qualification for the third C75 module, providing a detailed account of the assessment in both a vertical cryostat and the acceptance test results of the cryomodule. Furthermore, efforts have been made to address performance limitations arising from field emission and multipacting.

Rights

© 2024 by JACoW.

Published under the terms of a Creative Commons Attribution 4.0 International (CC BY 4.0) License.

Any further distribution of this work must maintain attribution to the authors, the published article's title, publisher, and DOI.

Original Publication Citation

Senevirathne, I., Cheng, G., McCaughan, M., Drury, M., Ciovati, G., & Weaks, M. (2024). Commissioning results of third C75 cryomodule for CEBAF. In F. Pilat, W. Fisher, R. Saethre, P. Anisimov, & I. Andrian (Eds.), Proceedings of the 15th International Particle Accelerator Conference. (pp. 188-191). JACoW Publishing. https://doi.org/10.18429/JACoW-IPAC2024-MOPC55

ORCID

0000-0001-9316-7704 (Ciovati)

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