Beam Acceleration Optimal Outcome:
To develop the advanced methods and surfaces needed for next-generation SRF cavities that enable game-changing reduction of cooling power, higher temperature operation, and higher accelerating fields for lower cryogenic system costs, energy sustainability, and simpler refrigeration.
Download Beam Acceleration Roadmap here .
Objective 1: Advanced SRF materials growth: Developing improved growth methods and understanding the impact of realistic (non-ideal) surfaces on performance.
Deliverable: Methods of growth and their refinement leading to annually significantly enhanced performance for Nb3Sn on Nb and Cu substrates (Annual).
Deliverable: Methods of growth and their refinement leading to annually significantly enhanced performance for Nb-Zr alloys (Annual).
Deliverable: Determination whether other materials have potential for higher efficiency and/or higher fields above Nb3Sn and Nb-Zr limits (Fall 2025).
Objective 2: Multi-layers and inhomogeneous layers: Increasing RF performance via surfaces by design.
Deliverable: Determination whether inhomogeneous surface layers can offer significantly increased RF performance over homogeneous materials (Fall 2024).
Objective 3 : Higher efficiency and higher fields: Demonstrate higher RF performance in proof-of-principle SRF cavities and study RF superconductivity under extreme conditions.
Deliverable: Surfaces from non-Nb with cooling power <4W/(active meter)/(MV/m)2 , corresponding to a 10x reduction in cooling power (Fall 2026).
Deliverable: Non-Nb, high efficiency surfaces capable of sustaining an accelerating field of 25 MV/m (Fall 2023).
Deliverable: Non-Nb surfaces supporting accelerating fields exceeding 50 MV/m (Fall 2026).
Deliverable: Documentation of best practices in specifying SRF material growth processes, critical material parameters, and material validation (Fall 2026).
