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SUMMARY:ATS Seminar - High Performance Nb SRF Cavities for Accelerators an
 d Quantum Science
DTSTART:20260616T090000Z
DTEND:20260616T100000Z
DTSTAMP:20260626T103000Z
UID:indico-event-1678000@indico.cern.ch
CONTACT:ats.director.office@cern.ch
DESCRIPTION:Speakers: Daniel Bafia\n\nSpeaker:\n\nDaniel Bafia\, Associate
  Scientist\nSuperconducting Quantum Materials and Systems Division\nFermil
 ab\n\nAbstract:\nThis presentation will highlight recent R&D efforts at Fe
 rmilab focused on niobium superconducting radio-frequency cavities for hig
 h Q and high gradient accelerator applications\, with extensions to quantu
 m information science. New insights into RF dissipation are obtained throu
 gh surface processing approaches including nitrogen incorporation\, contro
 lled oxygen diffusion\, and optimized electropolishing\, which enable syst
 ematic reduction of surface resistance while preserving strong high-field 
 performance. These results are enabled by combining precision cryogenic RF
  measurements with advanced materials characterization. The same processin
 g approaches demonstrate adaptability across cavity frequencies and geomet
 ries\, including recent studies on non-elliptical structures such as the b
 arrel cell cavity developed at CERN\, underscoring their relevance to evol
 ving accelerator concepts and ongoing collaborative efforts. In alignment 
 with these efforts\, Fermilab is contributing to the FCC 800 MHz SRF progr
 am\, where high-Q processing strategies are being explored in collaboratio
 n with CERN across both single-cell and multicell cavity development. This
  work builds on high-Q recipes first developed at Fermilab and supports th
 eir extension toward large-scale accelerator applications. In parallel\, v
 ariants of these resonant structures not only enable ultra-low-loss\, long
 -coherence quantum systems\, but also serve as highly sensitive testbeds f
 or materials characterization. By reducing complex multilayer devices to c
 ontrolled single-interface geometries\, key loss channels associated with 
 amorphous niobium oxide\, niobium hydrides\, and dielectric substrates can
  be directly identified and quantified. Together\, these results establish
  a materials-driven framework for controlling dissipation in superconducti
 ng resonators. Beyond accelerators\, this level of control enhances sensit
 ivity in dark sector searches\, highlighting the broader impact of SRF tec
 hnology across multiple frontiers of physics.\nBio:\nDr. Daniel Bafia is a
 n Associate Scientist at the Superconducting Quantum Materials and Systems
  (SQMS) Center at Fermilab\, where his research sits at the intersection o
 f accelerator technology and quantum information science. He received his 
 PhD from the Illinois Institute of Technology in 2020\, and his work focus
 es on superconducting materials and ultra-low-loss resonators for accelera
 tor and quantum computing applications\, with particular emphasis on diele
 ctric loss\, superconducting dissipation\, and vortex-induced microwave lo
 sses at millikelvin temperatures.\n ATS Seminar OrganisersA. Dallocchio (
 EN)\, E. Metral (BE)\,  T. Stora (SY)\, A. Sublet (TE)\n \n\nhttps://ind
 ico.cern.ch/event/1678000/\n\nZoom: https://cern.zoom.us/j/68033345463?pwd
 =VnQ6KmbDWNQujJ5Xev5dKGKE43dkdb.1
LOCATION:503/1-001 - Council Chamber (CERN)
URL:https://indico.cern.ch/event/1678000/
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