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JUNE 28 WEDNESDAY MORNING WS-18-WeM-INV.11 QA EFFORTS IN MANUFACTURING LARGE CRYOPUMP SYSTEMS FOR NUCLEAR FUSION APPLICATION. Hans S. Jensen and Chr. Day. Institute for Technical Physics, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany. Forschungszentrum Karlsruhe (FZK) is contributing to the ITER (Latin: The way) project, the next generation fusion machine. ITER is the experimental step between today’s studies of plasma physics and tomorrow's electricity-producing fusion power plants. It is an international project involving many Associations from all over the world. The philosophy of the ITER construction, which is planned to be ready in ten years from now, is based on in-kind contributions. This means that each Association is actively taking responsibility for the components it provides to ITER: responsibility in cost, time, compliance to the Technical Specification, and quality. Within the general Quality Assurance framework which is set by the ITER Legal Entity, there is quite some flexibility left for the individual Association as to how fulfil quality aspects for the specific component; this approach is typical for a big R&D project, such as ITER, involving many prototypical components. Forschungszentrum Karlsruhe is expected to become the leading Association for provision of the large tailor-made cryopumping systems for ITER. This talk exemplifies the FZK experiences of manufacturing and the related quality assurance management for a recently accomplished R&D project, namely for a cryosorption pumping system used in a test facility of a neutral beam injector that will be used to heat the plasma of a nuclear fusion reactor with a beam of deuterium or hydrogen molecules. The huge gas throughput into the vessel of the test facility results in challenging needs on the cryopumping system, comprising two identical tailor-made pumps. To establish a mean pressure of several 10 -5 mbar in the test vessel a pumping speed of about 350 m 3 /s per pump is needed. This was realized with charcoal coated cryopanels which effectively pump hydrogen. For the cooling of the cryopanels, liquid helium at saturation pressure is used and therefore a two-phase forced flow in the cryopump system must be controlled. FZK received the responsibility to design, build, install and test the hardware for this task. The FZK specified requirements, detailed in 11 individual technical specifications which each included strict QA requirements. The manufacturing of the components were placed with a large number of industrial companies within Europe. The central contract for the assembly of the cryopumps was placed with an industrial company with experience in manufacture of advanced scientific components. This Main Assembly Contractor (MAC) manufactured the cryopumps using FZK design and drawings, but MAC also received a number of special components as FZK free issue items, where FZK was responsible for the testing and quality control before, during and after the manufacture. This presentation begins with a short outline of the cryopumping system design. It then identifies the FZK activities during some of the manufacturing processes, in particular the Third Party premanufacturing approval, construction approval, inspection of approved materials, checking welders´ qualifications, signing quality plans, witnessing the pressure testing, witnessing the vacuum leak testing, etc. The vacuum integrity of the different circuits is of paramount importance and vacuum leak testing has been included as holding points in the Quality Plan. All components have been tested to
JUNE 28 WEDNESDAY MORNING WS-18-TuA-INV.10 SPANISH SYNCHROTRON RADIATION: SOURCE: PRO- JECT STATUS AND VACUUM SYSTEM. Ll. Miralles and E. Al-Dmour. CELLS, Barcelona. Spain The Storage Ring ALBA is a 3 GeV third generation synchrotron light source under construction in Barcelona (Spain). ALBA is optimized for high photon flux density with a beam emittance of 4.5 nm.rad and a large number of straight sections for Insertion Devices (3´ 8 m, 12´ 4.2 m and 2´ 2.6 m) in a relatively small circumference of 268.8 m. Top-up operation is foreseen from the start. The injector complex will consist of a 100 MeV Linac and a full energy Booster with a rather small emittance 9nm.rad. The design of the lattice and of the major components of the accelerator complex (Linac and Booster, Magnets, RF system, Vacuum system) has been completed and the procurement procedure has started for the large majority of them. The construction of the building is planned to start in the first half of 2006 and the commissioning of the storage ring is foreseen for the end of 2008. This report gives an overview of the status of the project. 107
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Sigilum Universitatis Studii Salama
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