Fabrication and Surface Treatment of Superconducting Rf Single Spoke Cavities for the Myrrha Project

Frank Marhauser, Massimilliano Moretti, Alexander Navitski, Yannick N. Hoerstensmeyer

    Research outputpeer-review


    The MYRRHA project, based at SCK•CEN (Belgium), aims at coupling a 600 MeV proton accelerator to a subcritical fission core with a maximal output of 100 MWth. The first phase of the project, MINERVA, includes the design, construction, and commissioning of a 100 MeV superconducting RF linac in order to demonstrate the machine requirements in terms of reliability and fault tolerance. The MINERVA linac comprises several cryomodules, each containing two Single Spoke 352.2 MHz cavities made out of high RRR niobium and operating at 2K. The fabrication and surface treatment of the Single Spoke RF Cavities is currently ongoing and completely carried out by RI Research Instruments GmbH (Germany); the first pre-series cavities were completed and delivered for cold testing. Main highlights of the fabrication include the deep-drawing of complex shapes, such as central spokes and outer caps of the cavity, which was successfully accomplished. As for the surface treatment, RI has commissioned, tested, and effectively started utilizing a new rotational buffered chemical polishing facility; this is required to polish the cavity inner surface, while ensuring an almost uniform material removal.
    Original languageEnglish
    Title of host publication21st International Conference on Radio-Frequency Superconductivity (SRF 2023)
    Place of PublicationMichigan, USA
    PublisherJACoW Publishing
    Number of pages6
    ISBN (Print)978-3-95450-234-9
    StatePublished - 30 Jun 2023
    Event2023 - 21st International Conference on Radio-Frequency Superconductivity - Grand Rapids
    Duration: 22 Jun 202330 Jun 2023
    Conference number: SRF 2023

    Publication series

    Name21st International Conference on Radio-Frequency Superconductivity (SRF 2023)
    PublisherJACoW Publisher
    ISSN (Print)2673-5504


    Conference2023 - 21st International Conference on Radio-Frequency Superconductivity
    Abbreviated titleSRF 2023
    Country/TerritoryUnited States
    CityGrand Rapids

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