Paper | Title | Page |
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MOPMB015 | Development of a Plasma-Enhanced Chemical Vapor Deposition System for High-Performance SRF Cavities | 100 |
SUSPB009 | use link to see paper's listing under its alternate paper code | |
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Funding: This work was supported by the U.S. National Science Foundation under Award PHY-1549132, the Center for Bright Beams Next-generation, thin-film surfaces employing Nb₃Sn, NbN, NbTiN, or other compound superconductors are essential for reaching enhanced RF performance levels in SRF cavities. However, optimized, advanced deposition processes are required to enable high-quality films of such materials on large and complex-shaped cavities. For this purpose, Cornell University is developing a plasma-enhanced chemical vapor deposition (CVD) system that facilitates coating on complicated geometries with a high deposition rate. This system is based on a high-temperature tube furnace with a high-vacuum, gas, and precursor delivery system, and uses plasma to significantly reduce the required processing temperature and promote precursor decomposition. Here we present an update on the development of this system, including final system design, safety considerations, assembly, and commissioning. |
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Poster MOPMB015 [1.951 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB015 | |
About • | Received ※ 16 June 2023 — Revised ※ 29 June 2023 — Accepted ※ 01 July 2023 — Issue date ※ 16 July 2023 | |
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MOPMB094 | Design of a 1.3 GHz High-Power RF Coupler for Conduction-Cooled Systems | 342 |
SUSPB027 | use link to see paper's listing under its alternate paper code | |
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Cornell is designing a new standalone, compact SRF cryomodule which uses cryocoolers in place of liquid helium for cooling. One of the biggest challenges in implementing such a system is designing a high-power input coupler which is able to be cooled by the cryocoolers without any additional liquid cryogenics. Due to the limited heat load capacity of the cryocoolers at 4.2 K, this requires very careful thermal isolation of the 4.2 K portion of the coupler and thorough optimization of the RF behavior to minimize losses. This paper will present the various design considerations which enabled the creating of a conduction-cooled 1.3 GHz input coupler capable of delivering up to 100 kW CW RF power. | ||
Poster MOPMB094 [0.964 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB094 | |
About • | Received ※ 16 June 2023 — Revised ※ 26 June 2023 — Accepted ※ 27 June 2023 — Issue date ※ 23 July 2023 | |
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WEPWB108 | Update on Cornell High Pulsed Power Sample Host Cavity | 841 |
SUSPB029 | use link to see paper's listing under its alternate paper code | |
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The Cornell High Pulsed Power Sample Host Cavity (CHPPSHC) is designed to measure the temperature-dependent superheating fields of future SRF materials and thereby gain insights into the ultimate limits of their performance. Theoretical estimation of the superheating fields of SRF materials is challenging and mostly has been done for temperatures near the critical temperature or in the infinite kappa limit. Experimental data currently available is incomplete, and often impacted by material defects and their resulting thermal heating, preventing finding the fundamental limits of theses materials. The CHPPSHC system allows reaching RF fields in excess of half a Tesla within microseconds on material samples by utilizing high pulsed power, thereby outrunning thermal effects. We are principally interested in the superheating field of Nb₃Sn, a material of interest for the SRF community, and present here the current fabrication and assembly status of the CHPPSHC as well as early results. | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB108 | |
About • | Received ※ 27 June 2023 — Revised ※ 20 July 2023 — Accepted ※ 20 August 2023 — Issue date ※ 22 August 2023 | |
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THIXA05 | Conduction-Cooled SRF Cavities: Opportunities and Challenges | 973 |
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Thanks to improvements in the performance of both commercial cryocoolers and Nb₃Sn-coated superconducting radio-frequency (SRF) cavities, it is now possible to design and build compact, SRF cryomodules without the need for liquid cryogenics. In addition, these systems offer robust, non-expert, turn-key operation, making SRF technology significantly more accessible for smaller-scale applications in fields such as industry, national security, medicine, environmental sustainability, etc. To fully realize these systems, many technical and operational challenges must be overcome. These include properly cooling the SRF cavity via thermal conduction and designing high-power (~ 100 kW continuous) RF couplers which dissipate minimal heat (~ 1 W) at 4.2 K. This presentation will discuss these challenges and the solutions which have been developed at Cornell University and elsewhere. | ||
Slides THIXA05 [7.219 MB] | ||
DOI • | reference for this paper ※ doi:10.18429/JACoW-SRF2023-THIXA05 | |
About • | Received ※ 27 June 2023 — Revised ※ 29 June 2023 — Accepted ※ 04 July 2023 — Issue date ※ 08 July 2023 | |
Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |