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Beam Acceleration

Beam Acceleration:

The Beam Acceleration theme will enable superconducting accelerating cavities with x10 lower power losses for lower costs, simpler refrigeration and wider access to high-power beams. It also aims to double the available accelerating gradient for less expensive, more compact accelerators. To achieve these goals, it will harness the expertise of condensed matter physicists and physical chemists to understand RF superconductivity, and learn to control the surfaces of niobium and compound superconductor cavities.

Objectives:

  • Fundamental Superconductivity and Nb3Sn: Current Nb3Sn films produced via vapor diffusion are limited to maximum surface field of ~80mT at 4.2K, and a 1.3GHz surface resistance of ~25nOhm. Develop and use experimental methods and advance fundamental theory of superconductivity to identify the sources of these Nb3Sn performance limitations.
  • Fundamental Superconductivity and Niobium: Improve fundamental understanding and control of the field-dependent surface resistance of niobium and use these advances to develop R&D surfaces, which at 2K, 1.3GHz, and 100mT have surface resistances reduced to <5nOhm, and at 150mT to <10nOhm.
  • Newer Material Options: Use experimental results and theoretical predictions to identify promising material options and arrangements for high gradient and/or high efficiency SRF operation.
  • Factor of 5 Increased Efficiency: Improve fundamental understanding and control of the synthesis kinetics of compound superconductors required to develop R&D surfaces, which at 4.2K, 1.3GHz, and 100mT reduce surface resistance to <8nOhm.
  • Increased Accelerating Field: Demonstrate fundamental understanding and control of the synthesis of a compound superconductor required to develop R&D surfaces that reach surface fields above the fundamental field limit of niobium (~200mT) in pulsed mode operation.

Our Team:

Theme Leaders:

Senior Investigators:
Graduate Students:
  • Paul Cueva, Cornell University
  • James Maniscalco, Cornell University
  • Alison McMillan, University of Chicago
  • Thomas Oseroff, Cornell University
  • Alden Pack, Brigham Young University
  • Ryan Porter, Cornell University
  • Biswas Rijal, University of Florida
  • Jeffrey Sayler, University of Chicago
  • Alen Senanian, Cornell University
  • Nathan Sitaraman, Cornell University
  • Aron Tesfamichael, Clark Atlanta University
  • Darren Veit, University of Chicago
Post Docs:
  • Rachael Farber, University of Chicago
  • Jacob Graham, University of Chicago
  • Danilo Liarte, Cornell University

Affiliates:

Project Titles (PI/Postdoc and/or Grad Students):

  • Ab initio theory of impurity doping of Nb (Arias / Sitaraman)
  • Ab initio theory of thin-film growth of Nb3Sn (Arias / Sitaraman)
  • Thermodynamics, synthesis conditions, and superconducting properties of the NbN and A15 phases (Hennig / Rijal)
  • Increasing Maximum Fields in Nb3Sn (Liepe / Porter)
  • Alternative Materials for High Q0 and/or High Fields (Liepe / Oseroff)
  • Field-Dependence of the BCS Surface Resistance and Impact of Impurity Doping (Liepe / Maniscalco)
  • Microscopic imaging of defects and trapped flux and their impact on the SRF quench fields and residual resistances (Muller / Cueva)
  • Nb3Sn Quenches (Jim Sethna / Senanian and Liarte)
  • Nb losses for LCLSII (Sethna / Liarte)
  • Studies of Nb Interfaces Including Oxides and Hydrides (Sibener / Veit and Sayler)
  • Surface Scattering Studies of Nb3Sn and MgB2 and Next-Generation Materials (Sibener / Graham and McMillan)
  • Surface Studies of Nb3Sn Growth and Structure (Sibener / Veit and Farber)
  • Vortex dynamics in Time-Dependent Ginzburg-Landau and Hsh in Eliashberg Theory (Transtrum / Pack)
  • Effect of Deformation on the Growth of Nb3Sn (Wang / Tesfamichael)