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

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Author: Sadakov, S. · Baross, T. · Biel, W. · Borsuk, V. · Hawkes, N. · Hellermann, M. von · Gille, P. · Kiss, G. · Koning, J. · Knaup, M. · Klinkhamer, J.F.F. · Krasikov, Yu. · Litnovsky, A. · Neubauer, O. · Panin, A.
Type:article
Date:2009
Institution: TNO Industrie en Techniek
Source:Fusion Engineering and Design, 7-11, 84, 1671-1675
Identifier: 241562
doi: doi:10.1016/j.fusengdes.2008.12.056
Keywords: Physics · Attachments · Electromagnetic loads · First mirror · ITER core charge exchange diagnostic · Shutter · Upper port plug · Attachments · Electromagnetic loads · First mirror · ITER core charge exchange diagnostic · Shutter · Upper port plug · Charge transfer · Conceptual design · Electromagnetic shielding · Electromagnetism · Experimental reactors · Mirrors · Plasmas · Radiation protection · Tokamak devices · Plasma diagnostics

Abstract

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 bearings. 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. © 2009 Elsevier B.V. All rights reserved.