Pre-series and testing route for the serial fabrication of W7-X target elements

Boscary, J.; Greuner, H.; Friedrich, T.; Traxler, H.; Mendelevitch, B.; Böswirth, B.; Schlosser, J.; Smirnow, M.; Stadler, R.

doi:10.1016/j.fusengdes.2009.02.005

Cited by 19 publications

(13 citation statements)

References 14 publications

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“…Instead of one originally planned, a total of four pre-series were necessary before launching the fabrication [10], [11], [12], [13]. It required the fabrication and testing of 60 full-scale target elements.…”

Section: A Pre-series Phase Imentioning

confidence: 99%

Summary of Research and Development Activities for the Production of the Divertor Target Elements of Wendelstein 7-X

Boscary

Peacock

Smirnow

et al. 2014

IEEE Trans. Plasma Sci.

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Abstract-The realization of the high heat flux divertor of the stellarator Wendelstein 7-X requires the production of 890 target elements. Since the divertor has to operate for 30 minutes with an input cw plasma power of 10 MW, the target elements need to be actively water-cooled. A target element is made of a CuCrZr copper alloy heat sink armored with CFC NB31 tiles. It is designed to remove a stationary heat flux of 10 MW/m² on its main area and 5 MW/m² at the end adjacent to the pumping gap. R&D activities proved to be essential for the preparation and the support of the on-going serial fabrication. The most critical issue is the stable production of the bonding between the CFC tiles and the heat sink as the divertor surface consists of about 16,000 tiles. The fast unexpected failure of one tile may reduce the whole divertor performance and, consequently, restrict the stationary machine operation. Two main R&D phases allow the design improvements of the target elements compatible with industrial and economic constrains of the series production as well as the development of quality controls such as a visual inspection system able to easily detect and fast record cracks at the interface between CFC tiles and heat sink.

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Section: A Pre-series Phase Imentioning

confidence: 99%

Summary of Research and Development Activities for the Production of the Divertor Target Elements of Wendelstein 7-X

Boscary

Peacock

Smirnow

et al. 2014

IEEE Trans. Plasma Sci.

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“…There are 5 types of elements ranging from 250 to 600 mm length and 50 to 61.5 mm width [1]. In all types the top tiles are made of "standard tiles" with 25 mm length.…”

Section: Types and Characteristics Of Target Elementsmentioning

confidence: 99%

“…The elements are designed to remove 10MW/m² heat flux. These elements are made of carbon fibre reinforced carbon (CFC) tiles as plasma facing material bonded with 3 mm Cu bi-layer and welded onto a CuCrZr structure [1]. About 16,000 flat CFC NB31 tiles have to be bonded onto the cooling structures Most of them, 14,000, are the thermally highest loaded standard CFC/Cu tiles on the top of the elements with dimensions of about 50 mm width, 25 mm length and 8 mm CFC thickness.…”

Section: Introductionmentioning

confidence: 99%

Results and consequences of high heat flux testing as quality assessment of the Wendelstein 7-X divertor

Greuner

Toussaint

Böswirth

et al. 2013

Fusion Engineering and Design

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The series manufacturing of the first 282 Wendelstein 7-X divertor elements was concluded in 2011. The divertor is designed to remove a steady-state heat load of 10 MW/m². 940 target elements of five different types made of CuCrZr heat sinks and covered with 16,000 CFC NB31 flat-tiles have to be produced. Additional to quality assessment during the manufacturing process, a final assessment of the delivered elements with operational heat load is indispensable to ensure a constant high thermal performance of the installed divertor. Based on the results of the pre-series testing a statistical quality assessment method has been developed for the series production. The application of this method to the series elements ensures their thermal performance with reasonable high heat flux test effort.

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“…After an intensive qualification phase with the manufacture of four preseries amounting to about 60 full-scale elements and a strong collaboration with the manufacturer, the serial production was launched in 2009. The main achievement of these activities was the introduction and qualification of the bi-layer technology [16] instead of the AMC (Active Metal Casting) alone used for Tore Supra [17]. All elements of the last delivered pre-series met the specification after 100 cycles @ 10MW/m².…”

Section: Target Elements Of the Hhf Divertormentioning

confidence: 99%

Design and technological solutions for the plasma facing components of WENDELSTEIN 7-X

Boscary

Stadler

Peacock

et al. 2011

Fusion Engineering and Design

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The operation of W7-X stellarator for pulse length up to 30 minutes with 10 MW input power requires a full set of actively water-cooled plasma facing components. From the lower thermally loaded area of the wall protection system designed for an averaged load of 100 kW/m² to the higher loaded area of the divertor up to 10 MW/m², various design and technological solutions have been developed meeting the high load requirements and coping with the restricted available space and the particular 3D-shaped geometry of the plasma vessel. 80 ports are dedicated alone to the water-cooling of plasma facing components and a complex networking of kilometers of pipework will be installed in the plasma vessel to connect all components to the cooling system. An advanced technology was developed in collaboration with industry for the target elements of the high heat flux (HHF) divertor, the so-called "bi-layer" technology for the bonding of flat tiles made from CFC NB31 onto the CuCrZr cooling structure. The design, R&D and the adopted technological solutions of plasma facing components are presented. At present, except the HHF divertor, most of plasma facing components has been already manufactured.

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Pre-series and testing route for the serial fabrication of W7-X target elements

Cited by 19 publications

References 14 publications

Summary of Research and Development Activities for the Production of the Divertor Target Elements of Wendelstein 7-X

Summary of Research and Development Activities for the Production of the Divertor Target Elements of Wendelstein 7-X

Results and consequences of high heat flux testing as quality assessment of the Wendelstein 7-X divertor

Design and technological solutions for the plasma facing components of WENDELSTEIN 7-X

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