Progress of ILC High Gradient SRF Cavity R&D at Jefferson Lab

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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 {center_dot} 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 ... continued below

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R.L. Geng, J. Dai, G.V. Eremeev, A.D. Palczewski September 1, 2011.

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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 {center_dot} 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.

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  • IPAC2011, 4-9 Sep 2011, San Sebastian, Spain

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  • Report No.: JLAB-ACC-11-1443
  • Report No.: DOE/OR/23177-1909
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1029319
  • Archival Resource Key: ark:/67531/metadc833273

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  • September 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 4:16 p.m.

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R.L. Geng, J. Dai, G.V. Eremeev, A.D. Palczewski. Progress of ILC High Gradient SRF Cavity R&D at Jefferson Lab, article, September 1, 2011; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc833273/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.