Double Cathode Configuration for the Nb Coating of HIE-ISOLDE Cavities

Ali Awais, Alexander Lunt, Alban Sublet, Guillaume Rosaz, Mauro Taborelli

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The Quarter Wave Resonator (QWR) cavities for HIEISOLDE project at CERN have entered their ending phase of production. Some R&D is still required to improve the uniformity of the Nb layer thickness on the cavity surface. In order to improve this behaviour one approach which has been proposed is to replace the single cathode with a double cathode and test the suitability of different deposition techniques. With this change it is possible to control the plasma and power distribution separately for the inner and outer part of cavity and thereby potentially improve film uniformity throughout the cavity and coating duration. In this study a comparison between the deposition rates obtained using a single cathode and a double cathode using Direct Current (DC)-bias diode sputtering, DC-magnetron sputtering (DCMS) and Pulsed DC-magnetron sputtering (PDCMS) is presented. The morphology of the thin film samples were compared using Focused Ion Beam (FIB) cross section milling and Scanning Electron Microscopy (SEM) analysis. INTRODUCTION
Original languageEnglish
Title of host publication18th Int. Conf. on RF Superconductivity (SRF'17), Lanzhou, China, July 17-21, 2017
Subtitle of host publicationSRF2017
PublisherJoint Accelerator Conferences Website (JACoW)
Number of pages5
ISBN (Print)978-3-95450-191-5
Publication statusPublished - 2018


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