Go to the Indico Home Page Oldest event Older event Up to category Newer event Newest event Printable version
  • Compact style
  • Indico style
  • Indico style - inline minutes
  • Indico style - numbered
  • Indico style - numbered + minutes
  • Indico Weeks View
    • Switch to the management area of this event
    Login

    CLIC Meeting (Fatigue/Breakdowns)

    → Europe/Zurich
    6/2-024 - BE Auditorium Meyrin (CERN)

    6/2-024 - BE Auditorium Meyrin

    CERN

    114
    Show room on map
    Gunther Geschonke (CERN)
    Support
      • 09:00 → 09:05
        Approval of minutes of the last meeting and follow up of actions 5m
        Speaker: Gunther Geschonke (CERN)
      • 09:05 → 09:15
        Short news of general interest (CSC, etc...) 10m
        Speaker: Jean-Pierre Delahaye (CERN)
      • 09:15 → 09:45
        Surface phenomena associated with thermal cycling of copper and their impact on the service life of particle accelerator structures 30m
        Four fatigue test procedures were used in the present study in order to investigate the fatigue behaviour of OFE copper: conventional fatigue (CVF), ultrasonic swinger (USS), laser fatigue (LAF) and radio-frequency fatigue (RFF). Characterisation and quantification of roughening and hardening phenomena on cycled samples revealed a strong dependence on the orientation of individual grains of the polycrystalline material. Additionally, grain boundaries need to be considered in fine structures (grain sizes as fine as 1 µm - 5 µm). The results obtained in the present study provide a framework for discussing material selection and material pretreatments, developing alternative engineering designs and working out monitoring strategies for long-term operation of the CLIC-AS.
        Speaker: Markus Aicheler (Ruhr-Universitaet Bochum)
        Slides
      • 09:45 → 10:15
        Comparative studies of rf and dc breakdowns and a short update on breakdown studies for CLIC 30m
        CLIC accelerating structures will have to provide 100MV/m loaded gradient at a challenging breakdown probability of less than 10^-7/pulse. To improve the understanding of breakdown physics, a program on basic breakdown research has been launched in the recent years including theoretical and experimental work on dc and rf breakdowns. Dc breakdown experiments are a faster and cheaper complement to rf breakdown experiments in CLIC accelerating structures aiming on material, surface preparation and general breakdown physics research. The applicability of experimental results gained from dc breakdowns to the design of rf structures needed therefore to be validated. To do so, comparative experiments were carried out with dc breakdowns in the CERN dc setup and with rf breakdowns in CTF and ASTA. The results and conclusions will be presented in this talk together with a short update on further experimental and theoretical studies on breakdowns.
        Speaker: Jan Kovermann (III. Physikalisches Institut (B) - Rheinisch-Westfaelische Tech.)
        Slides
        Video
      • 10:15 → 10:25
        Discussion 10m
      • 10:25 → 10:35
        A.O.B. 10m