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Foley, M.H.

Paper Title Page
TU5PFP057 Analyses of Defects in the Heat Affected Zone of Welded Niobium Coupons 956
 
  • L. Cooley, D. Burk, M.H. Foley, D.T. Hicks, R. Schuessler, C. Thompson, G. Wu
    Fermilab, Batavia
  
 

Combined temperature mapping and optical inspection of SRF cavities has revealed defects near the edge of the heat affected zone (HAZ) of numerous welds. We have re-created similar defects on welded coupons that were electropolished in the lab and characterized by a variety of tools. Several features that may have bearing on the origin of these defects are discussed, such as their location relative to grain boundaries, the strain state of the niobium prior to welding and etching, the electropolishing parameters, and so forth. Since coupons are useful for distribution to academic researchers, we also describe other detailed characterizations.

  
TU5PFP058 Construction of a 3.9 GHz Superconducting RF Cavity Module at Fermilab 957
 
  • H.T. Edwards, T.T. Arkan, M.H. Foley, M. Ge, E.R. Harms, A. Hocker, T.N. Khabiboulline, M.W. McGee, D.V. Mitchell, D.R. Olis, A.M. Rowe, N. Solyak
    Fermilab, Batavia
  
 

Funding: Work supported by the U.S. Department of Energy under contract No. DE-AC02-07CH11359.


Fermilab is in a collaboration with DESY to provide a cryomodule containing 4-3.9 GHz superconducting RF cavities to be placed in TTF/FLASH. The purpose of this 'Third Harmonic' module is to linearize the nonlinear beam energy-time profile produced by the 1.3 GHz accelerating gradient. The completed module has now been shipped to DESY and is awaiting cold, powered testing and installation into FLASH later this year. We report on experience with fabricating, testing, assembling, and shipping the module and its components with a focus on cavity test results.