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University of Nevada, Las Vegas. Department of Mechanical Engineering.

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Las Vegas (Nev.)

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Niobium cavities are important parts of the integrated NC/SC high-power linacs. Over the years, researchers in several countries have tested various cavity shapes. They concluded that elliptically shaped cells are the most appropriate shape for superconducting cavities. The need for very clean surfaces lead to the use of a buffered chemical polishing produce for surface cleaning to get good performance of the cavities. This is the third and final phase of the study.

The first phase has resulted in improving the basic understanding of multipacting and the process of chemical etching. The second phase has resulted in an experimental setup of a fluid flow experiment with experimentation to be completed in the third year. Other experimental activities include the evaluation of a vacuum system and various vacuum equipment purchases and modifications. An optimization code for a five cell niobium cavity based on resonant frequency and mode number was developed. Based on our conclusions so far, as well as our interaction with personnel at Los Alamos National Laboratory (LANL), we propose to focus on the following topics in the third phase of this project:

1. Optimize the cavity shape based on the desired resonant frequency and examine multipacting of that structure.

2. Studying secondary electronic emission from a niobium test piece under cryogenic conditions.

3. Experimental study of the etching process using flow visualization techniques.

4. Redesign the etching process to maximize surface uniformity.


Elliptical cells; Holes; Linear accelerators; Niobium cavities; Niobium – Surfaces; Radio frequency; Resonant radio frequency; Surfaces (Technology); Superconducting radio frequency; Superconductivity

Controlled Subject

Linear accelerators; Radio frequency; Superconductivity


Electrical and Computer Engineering | Mechanical Engineering | Metallurgy | Nuclear Engineering

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1015 KB




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