Publication Date


Document Type


First Advisor

Salehinia, Iman

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Mechanical Engineering


The SRF conduction link project at Fermi National Accelerator Laboratory aims to develop an SRF particle accelerator design that is more applicable for industrial use. Collaboration between NIU college of engineering and NIU department of physics provided the bulk of design and analysis for this project. Currently, cooling systems, used in SRF particle accelerators, pump liquid helium across the SRF cavity to provide convection based cooling. The goal of this project is to incorporate a conduction based cooling system. In a conduction based cooling system, heat will flow from the SRF cavity into a cryocooler through a conduction link. In addition, this particle accelerator design incorporates field emission via a cathode mounted within the cavity. Due to the significant effect of cathode placement on the emission characteristics of the cathode, a mounting component called the cathode rod will position the cathode in an optimal location. Steady state finite element thermal simulations and radio frequency electromagnetic simulations were performed in order to determine the dissipated power and operating temperature of the cavity components at various rod length configurations. Since the SRF cavity components must remain superconductive during operation, the temperature must remain below the superconductive threshold. Thermal simulation results indicated that an increase in length of the cathode rod corresponded to an increase in maximum operating temperature. A compromise between the cathode position and the maximum operating temperature of the cathode mount

resulted in the selection of an optimal cathode mount length. The results of the analysis influenced the design of the conduction link and cathode mount prior to fabrication, installation, and testing.


75 pages




Northern Illinois University

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