The Engineering Analysis In Support Of The Iter Electron Cyclotron Heating And Current Drive Transmission Lines

TitleThe Engineering Analysis In Support Of The Iter Electron Cyclotron Heating And Current Drive Transmission Lines
Publication TypeJournal Article
Year of Publication2011
AuthorsD.MS Ronden, M.A Henderson, B. Becket, T. Bigelow, J. Caughman, C. Darbos, F. Gandini, C. Nazare, D. Rasmussen, V. Udintsev
JournalFusion Science and Technology
Volume59
Issue4
Number4
Pagination718-728
Date PublishedMay
Type of ArticleProceedings Paper
ISBN Number1536-1055
KeywordsElectron cyclotron heating, ITER, transmission line
Abstract

An engineering study has been poformed on the ITER electron cyclotron transmission lines with the aim of optimizing its conceptual design. The support types and optimum spacing, cooling, vacuum, seismic, and gravitational effects were reviewed. For the vacuum system it was shown that two pumps per line, with a capacity of 50 l/s, are sufficient. It was explained that the temperature variation inside the building is the predominant factor that influences the thermal expansion of the lines. The support strategy is one of minimizing the number of constraints. Variation in support interspacing reduces the degree of harmonic disturbances. The section of transmission line inside the ITER port cell was identified as critical with regards to occurrence of deformation and stresses. Potential solutions are described. The use of seismic breaks is discussed in light of the differences in foundation and structure of the ITER tokamak building and assembly hall. It is proposed that this interface be studied in more detail, after more data is available on the behavior of these buildings. The geometry of individual supports should be simple, with the fewest possible adjustments. The supports are designed to allow small movements of the waveguide to compensate for the thermal expansion or contraction. The transmission line system can be made for optimum alignment during nominal operating temperatures by prestressing during installation.

DOI10.13182/FST59-718
Division

FP

Department

TP

PIDe146fb25945dcb2a16ec15dafc338588
Alternate TitleFusion Sci. Technol.

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