5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P1.049 Design development, integration and assembly of the ITER steady-state magnetic sensors

5 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 49
Poster D. Diagnostics, Data Acquisition and Remote Participation P1 Poster session

Speaker

Martin Kocan (Fircroft Engineering Services Ltd)

Description

The final design of the steady-state sensor diagnostic, developed collaboratively by ITER Organization and IPP Prague, is presented. The steady-state sensors – a subsystem of the ITER magnetic diagnostics – will contribute to the measurement of the plasma current, plasma-wall clearance, and local perturbations of the magnetic flux surfaces near the wall. The diagnostic consists of an array of sixty sensors mounted on the vacuum vessel outer shell and distributed approximately uniformly in the poloidal plane. The match-box size sensor housing accommodates a pair of bismuth Hall sensors [1] with the measurement axes parallel (in the poloidal plane) and normal to the vacuum vessel, and a thermocouple to compensate the variation of the Hall sensor output with the temperature. The housing also comprises a triplet of reflector nests for the as-installed metrology. The small mass/size of the housing helps to reduce the forces during a seismic event and due to Halo currents, and lowers the risk that the sensors won’t fit in the as-fabricated gap between the vacuum vessel and the thermal shield. Small-size housing also allows for a single-point attachment to the vacuum vessel which eliminates stresses on the housing due to thermal expansion and the loop force. The sensor attachment is designed to fulfil the stringent criteria for the weldments to the ITER vacuum vessel, and to allow for automated welding and the inspection of the root of the weld. The attachment features an isthmus-type stress relieve joint which is also to prevent the damage of the Hall sensors during the welding process, as was verified in a dedicated weld experiment and in thermal simulations. The contribution will also address the prototype R&D tests and magnetic simulations as well as the project schedule up to the sensors delivery in 2019. [1] I. Duran et al., this conference.

Co-authors

Christian Vacas (NATEC, C/ Marqués de San Esteban 52 entlo D, 33206 Gijón, Spain) George Vayakis (ITER Organization, St Paul Lez Durance Cedex, France) Guy Sandford (ITER Organization, St Paul Lez Durance Cedex, France) Ivan Duran (Institute of Plasma Physics, ASCR v.v.i. , Za Slovankou 3, 182 00 Prague, Czech Republic) Jose Miquel Carmona (AVS, Pol. Ind. Sigma Xixilion Kalea 2, Bajo Pabellón 10. 20870 Elgoibar., Spain) Julio Guirao (NATEC, C/ Marqués de San Esteban 52 entlo D, 33206 Gijón, Spain) Martin Kocan (Fircroft Engineering Services Ltd, , Birchwood Boulevard, Warrington, WA3 7QH, United Kingdom) Michael Walsh (ITER Organization, St Paul Lez Durance Cedex, France) Miguel Gonzalez (NATEC, C/ Marqués de San Esteban 52 entlo D, 33206 Gijón, Spain) Philippe Gitton (ITER Organization, St Paul Lez Durance Cedex, France) Quentin Pascual (Sogeti High Tech, 180 Rue René Descartes, 13857 Aix-en-Provence, France) Robert Walton (Intransic Engineering Ltd, Osler Road, Oxford, United Kingdom) Silvia Iglesias (NATEC, C/ Marqués de San Esteban 52 entlo D, 33206 Gijón, Spain) Slavomir Entler (Institute of Plasma Physics, ASCR v.v.i. , Za Slovankou 3, 182 00 Prague, Czech Republic)

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