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27. RAMI analysis of the ITER LFS CTS system

Author

Infante, V., Henriques, E., Gonçalves, B., Korsholm, S.B., Leipold, F., Gutierrez, H.E., Jensen, T., Jessen, M., Larsen, A.W., Naulin, V., Nielsen, S.K., Rasmussen, J., Salewski, M., Stejner, M., and Taormina, A.

Published
2017
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42. ITER collective Thomson scattering—Preparing to diagnose fusion-born alpha particles (invited)

Author

Korsholm, S. B., primary, Chambon, A., additional, Gonçalves, B., additional, Infante, V., additional, Jensen, T., additional, Jessen, M., additional, Klinkby, E. B., additional, Larsen, A. W., additional, Luis, R., additional, Nietiadi, Y., additional, Nonbøl, E., additional, Rasmussen, J., additional, Rechena, D., additional, Salewski, M., additional, Taormina, A., additional, Vale, A., additional, Varela, P., additional, Sanchez, L., additional, Ballester, R. M., additional, Udintsev, V., additional, and Liu, Y., additional

Published
2022
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46. ITER collective Thomson scattering-Preparing to diagnose fusion-born alpha particles (invited)

Author

Korsholm, S.B., Chambon, A., Gonçalves, B., Infante, V., Jensen, T., Jessen, M., Klinkby, E.B., Larsen, A.W., Luis, R., Nietiadi, Y., Nonbøl, E, Rasmussen, J., Rechena, D, Salewski, M., Taormina, A., Vale, A., Varela, P., Sanchez, L., Ballester, R.M., Udintsev, V., Liu, Y., Korsholm, S.B., Chambon, A., Gonçalves, B., Infante, V., Jensen, T., Jessen, M., Klinkby, E.B., Larsen, A.W., Luis, R., Nietiadi, Y., Nonbøl, E, Rasmussen, J., Rechena, D, Salewski, M., Taormina, A., Vale, A., Varela, P., Sanchez, L., Ballester, R.M., Udintsev, V., and Liu, Y.

Abstract

The ITER Collective Thomson scattering (CTS) diagnostic will measure the dynamics of fusion-born alpha particles in the burning ITER plasma by scattering a 1 MW 60 GHz gyrotron beam off fast-ion induced fluctuations in the plasma. The diagnostic will have seven measurement volumes across the ITER cross section and will resolve the alpha particle energies in the range from 300 keV to 3.5 MeV; importantly, the CTS diagnostic is the only diagnostic capable of measuring confined alpha particles for energies below ∼1.7 MeV and will also be sensitive to the other fast-ion populations. The temporal resolution is 100 ms, allowing the capture of dynamics on that timescale, and the typical spatial resolution is 10-50 cm. The development and design of the in-vessel and primary parts of the CTS diagnostic has been completed. This marks the beginning of a new phase of preparation to maximize the scientific benefit of the diagnostic, e.g., by investigating the capability to contribute to the determination of the fuel-ion ratio and the bulk ion temperature as well as integrating data analysis with other fast-ion and bulk-ion diagnostics.

Published
2022

47. Optimization of a cruciform specimen for fatigue crack growth under in and out-of-phase in-plane biaxial loading conditions.

Author

Baptista, R., Infante, V., and Madeira, J. F. A.

Subjects
*CRACK closure, *FRACTURE mechanics, *FATIGUE cracks, *CRACK propagation (Fracture mechanics), *FATIGUE crack growth, *FATIGUE life
Abstract

Mixed-mode loading conditions are present in different mechanical components. Understanding the influence of in-plane biaxial loading paths parameters allows for fatigue crack growth (FCG) prediction and component fatigue life assessment. Cruciform specimens are used to simulate these conditions, but large specimen dimensions are required in order to keep crack propagation unaffected by specimen geometry. This article describes the procedure used to optimize a new cruciform specimen geometry, with small dimensions. Having identified the specimen arms fillet as a major source of crack growth interference, this effect was kept to a minimum, while using arm slots with different widths and lengths. Individual slot dimensions were optimized using a Direct MultiSearch (DMS) algorithm, minimizing the stress intensity factor (SIF) difference between the optimal specimen and an infinite plate. FCG on the optimized specimen was simulated under in and out-of-phase loading conditions. Due to crack closure effects, fatigue propagation under fully out-of-phase loading is less sensitive to specimen geometry. Therefore, the final geometry was chosen considering the required biaxial loading ratio under in-phase loading. A new and optimized cruciform specimen was obtained using Direct MultiSearch (DMS). The notched specimen uses six different width and length slots per arm. The optimal specimen geometry provides accurate initial fatigue crack propagation angles. The optimal specimen can predict fatigue crack growth under in and out-of-phase loading conditions. [ABSTRACT FROM AUTHOR]

Published
2023
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