Award Date


Degree Type


Degree Name

Master of Science in Mechanical Engineering (MSME)


Mechanical Engineering

First Committee Member

Yitong Chen, Chair

Second Committee Member

Darrell Pepper, Chair

Number of Pages



Niobium Cavities are important parts of the integrated NC/SC high-power linear accelerator (linac) that can accelerate over 100 mA of protons to several GeV. Surface finish of the niobium cavity plays an important role of achieving the best performance of niobium cavity. The chemical etching techniques have been widely used.

Chemical etching of the inner surface of the cavity is achieved by circulating acid through it. The acid interacts with the surface and eliminates imperfections. During the etching process, a pipe with baffles is inserted within the cavity to direct the flow along the surfaces.

A 2-D, axisymmetric, steady state, incompressible fluid flow model is developed to simulate the chemical process. The Femlab code based on the finite-element method is used.

Benchmark cases were used to check the feasibility and accuracy of Femlab. Plausible results were achieved when the proved results were compared with the results got from FEMLAB software.


Etching; Harry Reid Center; Holes; Linear accelerators; Niobium – Surfaces; Surfaces (Technology)


Catalysis and Reaction Engineering | Materials Science and Engineering | Mechanical Engineering | Nuclear Engineering