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Abstract: (JACoW)
The ESS elliptical superconducting Linac consists of two types of 704.42 MHz cavities, medium and high beta, to accelerate the beam from 216 MeV (spoke cavity Linac) up to the final energy at 2 GeV. The last Linac optimization, called Optimus+ [1], has been carried out taking into account the limitations of SRF cavity performance (field emission). The medium and high-beta parts of the Linac are composed of 36 and 84 elliptical cavities, with geometrical beta values of 0.67 and 0.86 respectively. This work presents the latest vertical test results on ESS medium beta elliptical cavity prototypes. We describe the cavity preparation procedure from buffer chemical polishing to vertical test. Finally magnetic probes (Fluxgate) were installed on the cavity to determine magnetic field background during vertical test. The latest vertical test results showed that our cavity design performance are beyond requirements.
  • cavity
  • linac
  • cryomodule
  • SRF
  • status
  • [1]
    (THPPP071), IPAC12, New Orleans
    • H. Danared
    • [2]

      ESS Elliptical Cavities and Cryomodules

      • G. Devanz
    • [3]

      Progress in the Elliptical Cavities and Cryomodule Demonstrators for the ESS LINAC

      • F. Peauger
    • [4]

      Status and First Results of Two High Beta Prototype Elliptical Cavities for ESS

      • F. Peauger
    • [5]

      ESS Medium Beta Cavity Prototypes Manufacturing

      • E. Cenni
    • [6]

      Buffer chemical polishing study on ESS medium beta cavities

      • E. Cenni