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Introduction 2 3 Mechanical analysis, forces, design and alignment 2 4 Magnetic testing and performance 5 5 Thermal variation and stability 8 Summary This Technical Note presents details of the successful achievement of Technical Milestone 2 in the NYSERDA contract with Brookhaven National Laboratory and Cornell University. The project-to design, build and commission the Cornell-BNL Electron Test Accelerator (CBETA)-will achieve final success when all 12 Technical Milestones are complete. Milestone 2 marks the completion of Task 2, defined as: Task 2: Assemble Prototype Girder Task Goal: Assemble and test the prototype girder using 8 hybrid magnets. Deliverables: • An assembled prototype girder to be used in the accelerator circumference made of 8 hybrid magnets blocks embedded into iron poles and back-legs. • Perform rigorous magnetic, mechanical, alignment and thermal tests on the prototype and document the results of the tests. The assembly and testing of the prototype girder and its components are documented below.

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