COMMISSIONING RESULTS OF THIRD C75 CRYOMODULE FOR CEBAF

Conference · Wed May 01 04:00:00 EDT 2024

DOI:https://doi.org/10.18429/JACoW-IPAC2024-MOPC55· OSTI ID:2367526

Senevirathne, I. ^[1]; Cheng, G. ^[1]; McCaughan, M. ^[1]; Drury, M. ^[1]; Ciovati, G. ^[2]; Weaks, M. ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Old Dominion Univ., Norfolk, VA (United States)

The program to upgrade CEBAF cryomodules has been implemented to enhance the energy gain of refur-bished 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 pre-sents 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

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 2367526
• Report Number(s): JLAB-ACC-24-4068; DOE/OR/23177-7503
• Country of Publication: United States
• Language: English