MC7: Accelerator Technology
T07 Superconducting RF
Paper Title Page
Global Production of SRF Systems  
  • P. Zhang
    IHEP, Beijing, People’s Republic of China
  Many large accelerator facilities are based on superconducting RF technology. Sophisticated but meanwhile well established technical platforms are used. The exchange of knowledge and more and more the sharing of infrastructure is key to success. The world-wide network of platforms and the links between recent large projects will be described. Both long-established efforts as well as new and emerging efforts e.g. in China, will be described, based on material collected from colleagues around the world. The need of sustained operation will be highlighted.  
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RF Test Results of a Superconducting Cavity Cooled by a Cryocooler  
  • G. Ciovati, G. Cheng, K.A. Harding, R.A. Rimmer
    JLab, Newport News, Virginia, USA
  Funding: Work supported by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and by G. C. 2008 PECASE award.
The convergence of high-quality Nb3Sn film coatings and cryocoolers with more than 1 W of cooling power at 4 K, makes it possible to envision superconducting radiofrequency cavities operating at accelerating gradients of the order of 10 MV/m, cooled by conduction with a crycooler rather than by contact with a liquid He bath. Such possibility might open the possibility of applying the SRF technology to industrial accelerators. This contribution describes the design of a test stand for conduction cooling experiments and the rf test results of a 1.5 GHz single-cell cavity cooled using a single cryocooler.
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Plasma Processing to Reduce Field Emission in LCLS-II 1.3 GHz SRF Cavities  
  • B. Giaccone, P. Berrutti, M. Martinello
    Fermilab, Batavia, Illinois, USA
  • B. Giaccone
    IIT, Chicago, Illinois, USA
  A collaboration between FNAL, SLAC and ORNL is working to develop plasma processing for 1.3GHz LCLS-II cavities. Key strength of this technique is that it can be applied in situ inside the cryomodule to mitigate field emission due to hydrocarbon contamination. A new method that uses Higher Order Modes has been developed at FNAL for plasma ignition and plasma transfer inside the 9-cell cavity. Plasma processing has been applied to multiple single cell and 9-cell cavities showing positive results; its effectiveness is discussed in terms of Q and Radiation vs E performance before and after processing.  
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