Conceptual design of the ITER upper port plug for charge exchange diagnostic

TitleConceptual design of the ITER upper port plug for charge exchange diagnostic
Publication TypeConference Proceedings
Year of Publication2009
AuthorsS. Sadakov, T. Baross, W. Biel, V. Borsuk, N. Hawkes, M. von Hellermann, P. Gille, G. Kiss, J. Koning, M. Knaup, F. Klinkhamer, Y. Krasikov, A. Litnovsky, O. Neubauer, A. Panin
PublisherElsevier Science Sa
Accession NumberISI:000268012700122
KeywordsAttachments, Electromagnetic loads, First mirror, ITER core charge exchange diagnostic, Shutter, Upper port plug

A plug for the ITER core charge exchange recombination spectroscopy (core CXRS) is located in the upper port 3. It transfers the light emitted by interaction of plasma ions with the diagnostic neutral beam (DNB). The plug consists of a main shell, a shielding cassette and a retractable tube. The tube carries the first mirror (M1) with a shutter and allows multiple replacements of M1. A large uncertainty in the M1 lifetime has initiated a new design option with M1 located as far as possible from the first wall. A fast shutter has been proposed to enhance M1 protection. It operates consistently with a pulsed DNB and uses elastic hearings. Three-point attachment scheme of blanket shield modules (BSMs) has been suggested. It is capable to react electromagnetic loads caused by eddy- and halo-currents for any BSM option with a good design margin. The concern has been raised with regards to the forces caused by halo current and applied to the entire plug. Possible solutions are either to shunt and support the plug to the port in the frontal part, or re-attach all BSM in this belt from the plugs to the vacuum vessel. (C) 2009 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000268012700122

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