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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 and buffered chemical polishing produce good performance. The objective of the proposed research is to maximize the performance of the niobium cavities through studying multipacting, studying the effect of chemical etching on the surface roughness, and redesigning the cavities.

The US Congress has recently authorized exploring an alternative way to deal with spent nuclear fuel: Accelerator Transmuting of Waste (ATW). In this approach, a particle accelerator produces protons that react with a heavy metal target to produce neutrons. A major component of the system is a linear accelerator (linac) that can accelerate over 100 mA of protons to several GeV. Los Alamos National Laboratory (LANL) is currently developing a superconducting RF (SCRF) high-current linear accelerator. SCRF has three major components: niobium cavities, power couplers, and cryomodules. This proposal mainly deals with niobium cavities.

The research objectives are:

• To study the effect of multipacting on niobium cavities with single and multiple cells.

• To improve the uniformity of surface finish in chemical etching.

• To investigate the relationship between the shape and surface condition of the cell and its performance.

• To provide a systematic approach for improving the performance of the niobium cavities.


Elliptical cells; Holes; Linear accelerators; Niobium cavities; Niobium – Surfaces; Radio frequency; Resonant radio frequency; Surface (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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137 KB




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