Author: Eremeev, G.V.
Paper Title Page
MOPC111 Progress of ILC High Gradient SRF Cavity R&D at Jefferson Lab 334
 
  • R.L. Geng, J. Dai, G.V. Eremeev, A.D. Palczewski
    JLAB, Newport News, Virginia, USA
 
  Funding: US Department of Energy
Latest progress of ILC high gradient SRF cavity R&D at Jefferson Lab will be presented. 9 out of 10 real 9-cell cavities reached an accelerating gradient of more than 38 MV/m at a unloaded quality factor of more than 8·109. New understandings of quench limitation in 9-cell cavities are obtained through instrumented studies of cavities at cryogenic temperatures. Our data have shown that present limit reached in 9-cell cavities is predominantly due to localized defects, suggesting that the fundamental material limit of niobium is not yet reached in 9-cell cavities and further gradient improvement is still possible. Some examples of quench-causing defects will be given. Possible solutions to pushing toward the fundamental limit will be described.