Design and mechanical stability analysis of the interaction region for the inverse compton scattering gamma-ray source

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Design and mechanical stability analysis of the interaction region for the inverse compton scattering gamma-ray source, слайд №2

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Design and mechanical stability analysis of the interaction region for the inverse compton scattering gamma-ray source, слайд №25

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DESIGN AND MECHANICAL STABILITY ANALYSIS OF THE INTERACTION REGION FOR THE INVERSE COMPTON SCATTERING GAMMA-RAY SOURCE USING FINITE ELEMENT METHOD Thesis defense 7/5/2017

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Contents Introduction Design Static analysis Modal analysis Harmonic analysis Conclusion

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Introduction - ICS

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Introduction - ICS

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Introduction - Applications

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Introduction - FAST

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Introduction - Interaction region

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Introduction - Main challenge

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Design - Objective Cavity requirements: Recirculation cavity Target finesse > 1000 Vacuum chamber Impulse frequency 3 MHz No bending magnets Intersection angle   5 Focusing magnet diameter 40 mm Setup length < 1.5 m Electron line height over the floor 1200 mm

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Design - Finesse Finesse is a characteristic of oscillatory systems and resonators. R1 =99.9% (entrance mirror) R2 =99.995% (high reflectivity mirror)

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Design - Herriott cell

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Design - Finesse and amplification estimates

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Design - Herriott cell

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Designing - Dimensions

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Design - mounts and supports

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Design - Vacuum chamber and frame

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Static analysis - Implosion test

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Static analysis - Implosion test ANSYS stress units - MPa A36 steel properties: Density of 7,800 kg/m3 Young's modulus 200 GPa Poisson's ratio of 0.26 A36 steel in plates, bars, and shapes with a thickness of less than 8 in (203 mm) has a minimum yield strength of 36,000 psi (250 MPa)

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Static analysis - Implosion test

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Static analysis - Convergence

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Static analysis - Displacement

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Static analysis - Gravity compression

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Modal analysis The purpose of performing a modal analysis is to find the natural frequencies and mode shapes of a structure. If a structure is going to be subjected to vibrations, then it is important to analyze where the natural frequencies occur so that the structure can be designed appropriately.

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Modal analysis - Modal maps

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Modal analysis - Convergence

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Harmonic analysis - Full A harmonic analysis finds the steady state response of a structure under sinusoidal loading conditions. A harmonic, or frequency-response, analysis considers loading at one frequency only. Loads may be out-of-phase with one another, but the excitation is at a known frequency. This procedure is not used for an arbitrary transient load.

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Harmonic analysis - Loading data

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Harmonic analysis - Seismograph readings

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Harmonic analysis - Postprocessing

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Harmonic analysis - Postprocessing

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Harmonic analysis - Critical displacement Design success criterions: Mirror displacement should not exceed wavelength of 1.054 m Concave mirror tilt angle should not exceed  = 4.13*10-5 rad

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Harmonic analysis - Postprocessing

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Harmonic analysis - Solutions

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Conclusion ICS is an exceptional method of generating  radiation of high brilliance, its development is important for National security and a number of other applications. Designing of ICS interaction region is a complicated process that comes in several interconnected stages. Present design is a trade-off between technical requirements of finesse, size, mechanical stability and overall complexity. It has its limitations.