w coating of cfc tiles for the jet new wall - task agreement: jw6-ta-ep2-ilc-05 manufacturing and...

W coating of CFC tiles for the JET new wall

- Task Agreement: JW6-TA-EP2-ILC-05- Task Agreement: JW6-TA-EP2-ILC-05Manufacturing and testing of W-coated CFC tiles for installation Manufacturing and testing of W-coated CFC tiles for installation

in JET for the ITER-like Wall projectin JET for the ITER-like Wall project- Task Agreement: JW8-FT-JET-A - Task Agreement: JW8-FT-JET-A

Tungsten erosion in the JET divertorTungsten erosion in the JET divertor

Cristian Ruset, Cristian Ruset, Eduard GrigoreEduard GrigoreEURATOM-MEdC AssociationEURATOM-MEdC Association

NATIONAL INSTITUTE FOR LASER, PLASMA AND NATIONAL INSTITUTE FOR LASER, PLASMA AND RADIATION PHYSICS, BUCHAREST, ROMANIA RADIATION PHYSICS, BUCHAREST, ROMANIANILPRPNILPRP

EURATOM MEdC Association days, Bucharest 26-27 November 2009

OUTLINEOUTLINE

Overview of the Task Agreement: JW6-TA-EP2-ILC-05 Overview of the Task Agreement: JW6-TA-EP2-ILC-05 “Manufacturing and testing of W-coated CFC tiles for installation “Manufacturing and testing of W-coated CFC tiles for installation in JET for the ITER-like Wall project”in JET for the ITER-like Wall project”Current statusCurrent statusFuture actionsFuture actionsConclusionsConclusions


The material selection for the ITER ( in particular for the first wall) has a capitalThe material selection for the ITER ( in particular for the first wall) has a capitalimportance on the overall performance of the fusion reactor.importance on the overall performance of the fusion reactor.

Requirements:Requirements:

- Good mechanical properties, very good resistance to cyclic high thermal load,- Good mechanical properties, very good resistance to cyclic high thermal load,low sputtering yield, low tritium retention, low activation under neutronlow sputtering yield, low tritium retention, low activation under neutronirradiation and so on ..irradiation and so on ..

Candidates:Candidates:- C (CFC- Carbon fiber composite): disadvantage high tritium retention- C (CFC- Carbon fiber composite): disadvantage high tritium retention- Be: disadvantage low melting point (1555 K)Be: disadvantage low melting point (1555 K)- W: seems to be a good candidateW: seems to be a good candidate


In the R&D phase of the ITER-like Wall (ILW) project (2005-2006) it was 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 demonstrated that W coatings deposited on CFC by Combined Magnetron Sputtering and Ion Implantation (CMSII) technology, which was developed in Sputtering and Ion Implantation (CMSII) technology, which was developed in MEdC Association, had a better thermo-mechanical properties compared MEdC Association, had a better thermo-mechanical properties compared with other coating technologies.with other coating technologies.

The first option for ITER is a compromise meaning full beryllium main wall 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 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 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)ITER like Wall project has been launched at JET (Joint European Torus)

Requirements for the W coatings:Requirements for the W coatings:

• Thickness 10-15Thickness 10-15μμmm• Impurity content at 5 Impurity content at 5 μμm: C less that 10 at.%, O less than 5 at. %m: C less that 10 at.%, O less than 5 at. %• Cyclic high flux heat resistance: 200 pulses at a power density of 10.5 Cyclic high flux heat resistance: 200 pulses at a power density of 10.5 MW/mMW/m22 for 5 s for 5 s and Thermal screening 26 pulses with power densities from and Thermal screening 26 pulses with power densities from 6.0 MW/m6.0 MW/m22 to 23.5 MW/m to 23.5 MW/m22 and duration from 10 s to 1 s (Tests performed at and duration from 10 s to 1 s (Tests performed at Ion beam test facility IPP Garching)Ion beam test facility IPP Garching)


WMo

SEM image of a W/Mo coating GDOES depth profile for a W/Mo coating

Structure and chemical composition of the W coatings

0 5 10 15 20 25 30 35 400

20

40

60

80

100

O

TiMo

Con

cent

ratio

ns (

at.%

)

Depth (at.%)

W


SEM surface images of the coating deposited by CMSII (a) andby conventional magnetron sputtering (b) after cyclic thermal loading

(200 pulses of 10.5 MW/m2 / 5 s)

Cyclic thermal loading test of the coated CFC tiles


Image of the deposition equipment

Deposition equipment


Interior view of the JET tokamak

Technical specification of the CFC coated tiles:Technical specification of the CFC coated tiles:- Main chamber 10-15- Main chamber 10-15μμm W coatingm W coating- Divertor 200 - Divertor 200 μμm W coatingm W coating

After testing some prototype tiles coated with 20 After testing some prototype tiles coated with 20 μμm W by CMSII, a m W by CMSII, a decision concerning the coating of ~800 divertor tiles by using CMSII has decision concerning the coating of ~800 divertor tiles by using CMSII has been made. The task agreement been made. The task agreement JW6-TA-EP2-ILC-05 was extended.JW6-TA-EP2-ILC-05 was extended.


Tiles – C from the main chamber coating thickness 10-15 m

Diagnostic covers and shinethrough protection tiles from the main chamber coating thickness 10-15 m

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


Current status of the W coating production for the JET tiles at 20.11.2009Current status of the W coating production for the JET tiles at 20.11.2009

Status of coating divertor tilesStatus of coating divertor tiles

• Divertor G3 tiles – 49 tiles (100%)Divertor G3 tiles – 49 tiles (100%)• Divertor G4 tiles – 103 tiles (100%)Divertor G4 tiles – 103 tiles (100%)• Divertor HFGC tiles – 102 tiles (100%)Divertor HFGC tiles – 102 tiles (100%)• Divertor G6-102 tiles (100%)Divertor G6-102 tiles (100%)• Divertor G7-52 tiles Divertor G7-52 tiles 20 µm20 µm (97%)(97%)• Divertor Mushroom tiles - 6 tiles (Ready to be delivered to JET) (100%)Divertor Mushroom tiles - 6 tiles (Ready to be delivered to JET) (100%)• Divertor G1 - 106 tiles Divertor G1 - 106 tiles 20 µm20 µm (Ready to be delivered to JET) (100%) (Ready to be delivered to JET) (100%)• Divertor G8 -105 tiles Divertor G8 -105 tiles 20 µm20 µm (Ready to be delivered to JET) (100%)(Ready to be delivered to JET) (100%)• LBSRP 4 of 106 tiles LBSRP 4 of 106 tiles 20 µm20 µm (4%)(4%)

Total divertor coated tiles 629 (85%)


Status of coating main chamber tilesStatus of coating main chamber tiles

• Inner Wall Cladding – 70 tiles (100%)Inner Wall Cladding – 70 tiles (100%)• Shinethrough Protection – 54 tiles (51%)Shinethrough Protection – 54 tiles (51%)• Restrained Ring Protection – 57 tiles (100%)Restrained Ring Protection – 57 tiles (100%)• LBSRP Protection – 93 tiles (100%)LBSRP Protection – 93 tiles (100%)• IWGL (Be) – 68 tiles (100%)IWGL (Be) – 68 tiles (100%)• Diagnostic covers – 64 tiles (79%)Diagnostic covers – 64 tiles (79%)• Divertor B tiles – 80 tiles (95%) (Ready to be delivered to JET)Divertor B tiles – 80 tiles (95%) (Ready to be delivered to JET)• Divertor C tiles-104 tiles (100%) (Ready to be delivered to JET)Divertor C tiles-104 tiles (100%) (Ready to be delivered to JET)• Saddle coil 2 tiles ( 11%)Saddle coil 2 tiles ( 11%)• Poloidal limiters ( 9 tiles; uncoated)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


According to ITER Like Wall Project Management plan (JW6-PM-EP2-ILC-According to ITER Like Wall Project Management plan (JW6-PM-EP2-ILC-05) (Annex 1) milestones for the year 2009:05) (Annex 1) milestones for the year 2009:

Delivery to JET of 25% of the 10 µm main chamber tiles and 25% of the Delivery to JET of 25% of the 10 µm main chamber tiles and 25% of the divertor W-coated CFC tilesdivertor W-coated CFC tiles

Due date: 30.06.09.. Status: DoneStatus: Done

Production coating of the second batch comprising 50% of the divertor tilesProduction coating of the second batch comprising 50% of the divertor tiles

Due date: 31.12.09. Status: DoneStatus: Done

Production coating of all the remaining tilesProduction coating of all the remaining tiles

Due date: 30.09.10

Final report and outstanding documentationFinal report and outstanding documentation

Due date: 14.12.10

Future actions:Future actions:


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


0 5 10 15 20 25 30 350

20

40

60

80

100

O

TiMo

Con

cent

ratio

ns (

at. %

)

Depth (m)

W

GDOES depth profile for a W/Mo coating SEM image for a W/Mo structure


CONCLUSIONSCONCLUSIONS

Up now ~ 85% (629 tiles) of the divertor have been coated. 408 tiles have 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.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 274 tiles from main chamber have been delivered to JET, and 318 are ready to be delivery.ready to be delivery.

Results of the HHF test at IPPResults of the HHF test at IPP - tested tiles: 117 (~ 12% of series production)- tested tiles: 117 (~ 12% of series production) - tiles which passed the tests: 117- tiles which passed the tests: 117 - rejected tiles: 0- rejected tiles: 0

The works are in scheduleThe works are in schedule

Thank you for your attention!Thank you for your attention!

w coating of cfc tiles for the jet new wall - task agreement: jw6-ta-ep2-ilc-05 manufacturing and...

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