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(ITERP1/26) The ITER Divertor Cassette Project

M. Ulrickson¹, R. Tivey², M. Akiba³, T. Ando², A. Antipenkov², M. Araki³, V. Barabash², P. Chappuis⁴, S. Chiocchio², V. Divavin⁷, D. Driemeyer⁵, K. Ezato³, G. Federici², M. Grattarola⁶, G. Janeschitz², E. Kuzmin⁷, A. Makhankov⁷, I. Mazul⁷, M. Merola⁸, K. Nakamura³, R. Nygren¹, H. D. Pacher⁸, L. Plöchl⁹, B. Riccardi¹⁰, M. Rödig¹¹, J. Schlosser⁴, K. Slattery⁵, S. Suzuki³, G. Vieider⁸, R. Watson¹, G. Willie⁵, C. H. Wu⁸, D. Youchison¹

¹ Sandia Nat. Lab, MS-1129, P.O. Box 5800, Albuquerque, NM 87185 USA
² ITER Joint Work Site, Boltzmannstr.2, 85748 Garching, Germany
³ JAERI, Naka-machi, Ibaraki-ken 311-01 Japan
⁴ CEA, Cadarache, France
⁵ Boeing Co., St.Louis, Mo 63134, USA
⁶ Ansaldo, I-16161 Genova, Italy
⁷ D.V. Efremov Research Institute, St.Petersburg, Russia
⁸ NET Team, Boltzmannstr. 2, 85748 Garching, Germany
⁹ Plansee, A-6600 Reutte, Austria
¹⁰ ENEA, I-00044 Frascati, Italy
¹¹ Forschungscentrum Jülich GmbH, D-52425 Jülich, Germany

Abstract.  The divertor ``Large Project'' was conceived with the aim of demonstrating the feasibility of meeting the lifetime requirements by employing the candidate armor materials of beryllium, tungsten (W) and carbon-fiber-composite (CFC). At the start, there existed only limited experience with constructing water-cooled high heat flux armored components for tokamaks. To this was added the complication posed by the need to use a silver-free joining technique that avoids the transmutation of n-irradiated silver to cadmium. The research project involving the four Home Teams (HTs) has focused on the design, development, manufacture and testing of full-scale Plasma Facing Components (PFCs) suitable for ITER. The task addressed all the issues facing ITER divertor design, such as providing adequate armor erosion lifetime, meeting the required armor-heat sink joint lifetime and heat sink fatigue life, sustaining thermal-hydraulic and electromechanical loads, and seeking to identify the most cost-effective manufacturing options. This paper will report the results of the divertor large project.

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