Publication Date


Document Type


First Advisor

Salehinia, Iman

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Mechanical Engineering


The Proton Improvement Plan-II (PIP-II) at Fermi National Accelerator Laboratory(FNAL) will create a new and vastly improved accelerator, which will be the source of high energy particles for the experiments taking place at FNAL. The new linear accelerator (LINAC) contains several types of cryomodules, which are individual particle accelerators. The last cryomodule in the LINAC will be the High-Beta 650 (HB650), which will operate at 650 MHz. Each module is approximately 15 meters in length, 1.5 meters wide, weighs 13 tonnes, and shares many design features with three of the other cryomodules. The HB650 consists of two primary sections, the outer vacuum vessel, and the components that reside within it which will be cooled to cryogenic temperatures – the cold mass. Once assembly is complete at FNAL, it will be transported to one of three places: another location at FNAL, another National Laboratory within the continental United States, or to a scientific partner in Europe. Any excitation the module experiences, such as going over rough roads when on a semitrailer, can create high stresses in components and cause failure if severe enough. Additionally, any delicate components with low resonant frequencies that match the excitation spectrum could achieve resonance, potentially causing a fatigue failure by repeated flexing. To ensure the successful transportation of the HB650, a transport analysis utilizing ANSYS simulation software has been performed on major sub-assemblies, as well as analysis of the sub-assemblies as a combined system. The optimization of components, design of support structures, and overall increasing of the lowest resonant frequencies has resulted in a cryomodule which will be better equipped to handle transportation, and any large impact loads that come with it.


174 pages




Northern Illinois University

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