Keyword: data-acquisition
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TUPB059 A Facility for Magnetic Field Penetration Measurements on Multilayer S-I-S Structures experiment, niobium, SRF, superconducting-magnet 716
 
  • O.B. Malyshev, K.D. Dumbell, L. Gurran, N. Pattalwar, S.M. Pattalwar, R. Valizadeh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • K.D. Dumbell, S.M. Pattalwar, R. Valizadeh
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • A.V. Gurevich
    ODU, Norfolk, Virginia, USA
  • L. Gurran
    Lancaster University, Lancaster, United Kingdom
  • L. Gurran
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  
  Funding: STFC and US Department of Energy under contract No. DE-SC0010081.
Superconducting RF cavities made of bulk Nb has reached a breakdown field of about 200 mT which is close to the superheating field for Nb. As it was theoretically shown* a multilayer coating can be used to enhance the breakdown field of SRF cavities. The simple example is a superconductor-insulator-superconductor (S-I-S), for example bulk niobium (S) coated with a thin film of insulator (I) followed by a thin layer of a superconductor (S) which could be a dirty niobium**. To verify such an enhancement in a presence of a DC magnetic field at 4.2 K a simple experimental facility was designed, built and tested in ASTeC. The details of experimental setup and results of the measurements will be shown at the conference.
*A. Gurevich, APL 88, 012511 (2006)
**A. Gurevich, AIP Advances, 5, 017112 (2015) 		 
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THPB095 Automatic RF Conditioning Test Bench of Fundamental Power Couplers for the European XFEL Accelerator vacuum, controls, SRF, interface 1367
 
  • S. Sierra, C. Lievin, P. Rouillon
    TED, Velizy, France
  • H. Guler, W. Kaabi, A. Verguet
    LAL, Orsay, France
  
  In order to perform the RF conditioning of the fundamental coupler for the XFEL accelerator, Thales and LAL developed together a test bench being able to make the automatic RF conditioning. The capability of this test bench is of 4 pairs of coupler at the same time with automatic sequences of increasing the RF power. The test bench is composed of the overall RF station providing up to 5 MW peak power at 1.3 GHz. The waveguide distribution allows 4 individual RF lines for conditionning,and the automatic sequence applied to the couplers in respect with all signals monitored and controlled during the RF process. The paper will also provide some examples of such process.  
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