Fabrication of 3.0-GHz Single-cell Cavities for Thin-film Study

Saeki, Takayuki; Hannon, Fay; Hayano, H.; Inoue, Hitoshi; Ito, Hayato; Iwashita, Yoshihisa; Katayama, Ryo; Kubo, Takayuki; Rimmer, Robert; Tongu, Hiromu; Valente-Feliciano, Anne-Marie

doi:10.18429/jacow-srf2019-mop054

Cited by 1 publication

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“…When transferring, deposition processes to 3D cavity structures, coating conditions can vary greatly at different locations (equator versus iris or beam tubes). In this context, the use of a sample host cavity, so-called "coupon cavity" that has detachable coupon samples at equivalent positions in elliptical cavities [96] can prove to be a useful tool to test the thin film creation and assess the properties variation along the cavity profile. The coupon samples produced can then be evaluated by various characterization techniques.…”

Section: Development Of Superconductor-insulator-superconductor (Sis)...mentioning

confidence: 99%

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

Valente-Feliciano,

Antoine,

Anlage

et al. 2022

Preprint

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Superconducting radio frequency (SRF) systems, essentially based on bulk niobium (Nb), are the workhorse of most particle accelerators and achieve high levels of performance and reliability. Today's exceptional performance of bulk Nb SRF cavities is the fruit of more than five decades of intensive research, essentially aimed at optimizing the material for thermal stabilization of defects, and significant funding efforts. Last incremental advances with several novel surface treatments are allowing Nb cavities to exceed previous record Q factors and avoiding degradation with increasing gradients. These include nitrogen infusion and doping, oxygen alloying with a two-step baking process. The next generation of particle accelerators will require operational parameters beyond the state-of-the-art Nb capabilities. Superconducting RF has then to rely on superior materials and advanced surfaces beyond bulk Nb for a leap in performance and efficiency. The SRF thin film development strategy aims at transforming the current SRF technology into a technology using highly functional materials, where all the necessary functions are addressed. The community is deploying efforts in three research thrusts to develop the next-generation thin-film based cavities. The first line of developments aims at investigating Nb/Cu coated cavities that perform as good as or better than bulk niobium at reduced cost and with better thermal stability. Recent results with greatly improved accelerating field and dramatically reduced Q-slope show the potential of this technology for many applications. In particular high current storage ring colliders such as FCC, EIC and CEPC, where the frequency is typically lower and the gradients are modest, could benefit greatly from the cost savings and operational advantages of this technology. The second research thrust is to develop cavities coated with materials that can operate at higher temperatures or sustain higher fields. Proof-of-principle has been established for the merit of Nb 3 Sn for SRF applications. Research is now needed to further exploit the material and reach its full potential with novel deposition techniques. The third line of research is to push SRF performance beyond the capabilities of the superconductors alone with multi-layer coatings. In parallel, developments are needed to provide quality substrates, innovative cooling schemes and cryomodule design tailored to SRF thin film cavities.Recent results in these three research thrusts suggest that SRF thin film technologies are at the eve of a technological revolution. However, in order for them to mature, active community support and sustained funding are needed and should address fundamental developments supporting material deposition techniques, surface and RF research, and technical challenges associated with scaling, automation and industrialization. With dedicated and sustained investment in SRF thin film R&D, next-generation thin-film based cavities will become a reality with high performance and efficiency, facilitating energy su...

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Section: Development Of Superconductor-insulator-superconductor (Sis)...mentioning

confidence: 99%