Upgrade of the Fermilab Spoke Test Cryostat for Testing of PIP-II 650 MHz 5-Cell Elliptical Cavities

Conference · Sat Aug 17 04:00:00 EDT 2019

DOI:https://doi.org/10.18429/JACoW-SRF2019-THP091· OSTI ID:1843464

Sukhanov, Alexander ^[1]; Chandrasekaran, Saravan Kumar ^[1]; Contreras-Martinez, Crispin ^[2]; Hanna, Bruce ^[1]; Nicol, Thomas ^[1]; Ozelis, Joseph ^[1]; Pischalnikov, Yuriy ^[1]; Plant, Derek ^[1]; Prokofiev, Oleg ^[1]; Pronitchev, Oleg ^[1]; Roger, Vincent ^[1]; Schappert, Warren ^[1]; Terechkine, Iouri ^[1]; Yakovlev, Vyacheslav ^[1]

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1. Fermilab
2. Michigan State U., East Lansing (main)

Design of the high beta 650 MHz prototype cryomodule for PIP-II is currently undergoing at Fermilab. The cryomodule includes six 5-cell elliptical SRF cavities with accelerating voltage up to 20 MV and low heat dissipation (Q₀ > 3·10^{z}EhNZeHn). Characterization of performance of fully integrated jacketed cavities with high power coupler and tuner is crucial for the project. Such a characterization of jacketed cavity requires a horizontal test cryostat. Existing horizontal testing facilities at Fermilab, Horizontal Test Stand (HTS) and Spoke Test Cryostat (STC), are not large enough to accommodate jacketed 650 MHz 5-cell cavity. An upgrade of the STC is proposed to install extension to the cryostat and modify cryogenic connections and RF infrastructure to provide testing of 650 MHz cavities. In this paper we describe STC upgrade and commissioning of the upgraded facility. We discuss mitigation of issues and problems specific for testing of high Q₀ 650 MHz cavities, which require low residual magnetic field and low acoustic and mechanical vibrations environment.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1843464
• Report Number(s): FERMILAB-CONF-19-780-AD-SQMS-TD; oai:inspirehep.net:1780564
• Country of Publication: United States
• Language: English

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