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W coating of CFC tiles for the JET new wall

NILPRP. W coating of CFC tiles for the JET new wall. NATIONAL INSTITUTE FOR LASER, PLASMA AND RADIATION PHYSICS, BUCHAREST, ROMANIA. - Task Agreement: JW6-TA-EP2-ILC-05 Manufacturing and testing of W-coated CFC tiles for installation

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W coating of CFC tiles for the JET new wall

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  1. NILPRP W coating of CFC tiles for the JET new wall NATIONAL INSTITUTE FOR LASER, PLASMA AND RADIATION PHYSICS, BUCHAREST, ROMANIA - Task Agreement: JW6-TA-EP2-ILC-05 Manufacturing and testing of W-coated CFC tiles for installation in JET for the ITER-like Wall project - Task Agreement: JW8-FT-JET-A Tungsten erosion in the JET divertor Cristian Ruset, Eduard Grigore EURATOM-MEdC Association EURATOM MEdC Association days, Bucharest 26-27 November 2009

  2. OUTLINE • Overview of the Task Agreement: JW6-TA-EP2-ILC-05 “Manufacturing and testing of W-coated CFC tiles for installation in JET for the ITER-like Wall project” • Current status • Future actions • Conclusions EURATOM MEdC Association days, Bucharest 26-27 November 2009

  3. The material selection for the ITER ( in particular for the first wall) has a capital importance on the overall performance of the fusion reactor. Requirements: - Good mechanical properties, very good resistance to cyclic high thermal load, low sputtering yield, low tritium retention, low activation under neutron irradiation and so on .. • Candidates: • - C (CFC- Carbon fiber composite): disadvantage high tritium retention • Be: disadvantage low melting point (1555 K) • W: seems to be a good candidate EURATOM MEdC Association days, Bucharest 26-27 November 2009

  4. The first option for ITER is a compromise meaning full beryllium main wall with CFC at the strike points and tungsten divertor baffles and dome. In order to test this combination including Be, W and W coated CFC tiles, the ITER like Wall project has been launched at JET (Joint European Torus) In the R&D phase of the ITER-like Wall (ILW) project (2005-2006) it was demonstrated that W coatings deposited on CFC by Combined Magnetron Sputtering and Ion Implantation (CMSII) technology, which was developed in MEdC Association, had a better thermo-mechanical properties compared with other coating technologies. • Requirements for the W coatings: • Thickness 10-15μm • Impurity content at 5 μm: C less that 10 at.%, O less than 5 at. % • Cyclic high flux heat resistance: 200 pulses at a power density of 10.5 MW/m2 for 5 sand Thermal screening 26 pulses with power densities from 6.0 MW/m2 to 23.5 MW/m2 and duration from 10 s to 1 s (Tests performed at Ion beam test facility IPP Garching) EURATOM MEdC Association days, Bucharest 26-27 November 2009

  5. W Mo Structure and chemical composition of the W coatings SEM image of a W/Mo coating GDOES depth profile for a W/Mo coating EURATOM MEdC Association days, Bucharest 26-27 November 2009

  6. Cyclic thermal loading test of the coated CFC tiles SEM surface images of the coating deposited by CMSII (a) and by conventional magnetron sputtering (b) after cyclic thermal loading (200 pulses of 10.5 MW/m2 / 5 s) EURATOM MEdC Association days, Bucharest 26-27 November 2009

  7. Deposition equipment Image of the deposition equipment EURATOM MEdC Association days, Bucharest 26-27 November 2009

  8. Interior view of the JET tokamak Technical specification of the CFC coated tiles: - Main chamber 10-15μm W coating - Divertor 200 μm W coating After testing some prototype tiles coated with 20 μm W by CMSII, a decision concerning the coating of ~800 divertor tiles by using CMSII has been made. The task agreement JW6-TA-EP2-ILC-05 was extended. EURATOM MEdC Association days, Bucharest 26-27 November 2009

  9. Diagnostic covers and shinethrough protection tiles from the main chamber coating thickness 10-15 m Tiles – C from the main chamber coating thickness 10-15 m

  10. G 4 divertor tiles coated with 10-15 m W in series production G 6 and G7 divertor tiles coated with 20-25 m W in series production EURATOM MEdC Association days, Bucharest 26-27 November 2009

  11. Current status of the W coating production for the JET tiles at 20.11.2009 • Status of coating divertor tiles • Divertor G3 tiles – 49 tiles (100%) • Divertor G4 tiles – 103 tiles (100%) • Divertor HFGC tiles – 102 tiles (100%) • Divertor G6-102 tiles (100%) • Divertor G7-52 tiles 20 µm(97%) • Divertor Mushroom tiles - 6 tiles (Ready to be delivered to JET) (100%) • Divertor G1 - 106 tiles 20 µm (Ready to be delivered to JET) (100%) • Divertor G8 -105 tiles 20 µm(Ready to be delivered to JET) (100%) • LBSRP 4 of 106 tiles 20 µm(4%) Total divertor coated tiles 629 (85%) EURATOM MEdC Association days, Bucharest 26-27 November 2009

  12. Status of coating main chamber tiles • Inner Wall Cladding – 70 tiles (100%) • Shinethrough Protection – 54 tiles (51%) • Restrained Ring Protection – 57 tiles (100%) • LBSRP Protection – 93 tiles (100%) • IWGL (Be) – 68 tiles (100%) • Diagnostic covers – 64 tiles (79%) • Divertor B tiles – 80 tiles (95%) (Ready to be delivered to JET) • Divertor C tiles-104 tiles (100%) (Ready to be delivered to JET) • Saddle coil 2 tiles ( 11%) • Poloidal limiters ( 9 tiles; uncoated) Total main chamber coated tiles 572 All prototypes and ~ 12% of tiles have passed the HHFT (High Heat Flux Tests) performed at IPP Garching EURATOM MEdC Association days, Bucharest 26-27 November 2009

  13. According to ITER Like Wall Project Management plan (JW6-PM-EP2-ILC-05) (Annex 1) milestones for the year 2009: • Delivery to JET of 25% of the 10 µm main chamber tiles and 25% of the divertor W-coated CFC tiles Due date: 30.06.09.Status: Done • Production coating of the second batch comprising 50% of the divertor tiles Due date: 31.12.09.Status: Done Future actions: • Production coating of all the remaining tiles Due date: 30.09.10 • Final report and outstanding documentation Due date: 14.12.10 EURATOM MEdC Association days, Bucharest 26-27 November 2009

  14. Marker tiles for erosion measurements (Tungsten erosion in the JET divertor TA JW8-FT-JET-A) • A number of markers (a multilayered structure W/Mo/W/Mo) will be used for measurements of wall erosion • Tiles type used as markers: G1, G8, G6, G7 (4 each type) • Required coating structure: Mo (first layer): 2-3 µm; W (first layer): 12-14 µm; Mo (second layer); 3-4 µm; W (second layer): 3-4 µm • The markers were already coated and sent to IPP Garching EURATOM MEdC Association days, Bucharest 26-27 November 2009

  15. GDOES depth profile for a W/Mo coating SEM image for a W/Mo structure EURATOM MEdC Association days, Bucharest 26-27 November 2009

  16. CONCLUSIONS • Up now ~ 85% (629 tiles) of the divertor have been coated. 408 tiles have been sent already to JET and 221 are ready to be delivered. • 274 tiles from main chamber have been delivered to JET, and 318 are ready to be delivery. • Results of the HHF test at IPP - tested tiles: 117 (~ 12% of series production) - tiles which passed the tests: 117 - rejected tiles: 0 • The works are in schedule

  17. Thank you for your attention!

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