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Superconducting RF is a key technology for future particle accelerators, nowrelying on advanced surfaces beyond bulk Nb for a leap in performance andefficiency. The SRF thin film strategy aims at transforming the current SRFtechnology by using highly functional materials, addressing all the necessaryfunctions. The community is deploying efforts in three research thrusts todevelop next-generation thin-film based cavities. Nb on Cu cavities aredeveloped to perform as good as or better than bulk Nb at reduced cost and withbetter thermal stability. Recent results showing improved accelerating fieldand dramatically reduced Q slope show their potential for many applications.The second research thrust is to develop cavities coated with materials thatcan operate at higher temperatures or sustain higher fields. Proof of principlehas been established for the merit of Nb3Sn for SRF application. Research isnow needed to further exploit the material and reach its full potential withnovel deposition techniques. The third line of research is to push SRFperformance beyond the capabilities of the superconductors alone withmultilayered coatings. In parallel, developments are needed to provide qualitysubstrates, cooling schemes and cryomodule design tailored to thin filmcavities. Recent results in these three research thrusts suggest that SRF thinfilm technologies are at the eve of a technological revolution. For them tomature, active community support and sustained funding are needed to addressfundamental developments supporting material deposition techniques, surface andRF research, technical challenges associated with scaling andindustrialization. With dedicated and sustained investment, next-generationthin-film based cavities will become a reality with high performance andefficiency, facilitating energy sustainable science while enabling higherluminosity, and higher energy.

Next-Generation Superconducting RF Technology based on Advanced Thin  Film Technologies and Innovative Materials for Accelerator Enhanced  Performance and Energy Reach