WEST work in C4 will concentrate on C4 marker tiles (samples sent to RUs in February, 2 spare samples available) and creating a summary of C3 marker-tile results --> action on CEA to coordinate
NB1! On C4 samples, deposition areas larger and deposits thicker and ISP/OSP erosion areas shifted and expanded --> differences expected compared to C3 analyses
NB2! Use the agreed s coordinate system and make measurements in poloidal direction (~central line)
In addition on the agenda are (i) completing full-tile analyses of C5 markers + sending the tiles to VTT, (ii) initiating analyses of ITER-like PFUs (full-tile analyses ongoing, cutting plan being discussed)
Pre-characterization of Phase II samples completed in 2021
Questions:
CP: Erosion and deposition rates on C3 and C4 markers? Comparable to AUG, clearly < 1 nm/s.
09:30
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09:40
MPG activities in 2022 on WEST and W7-X samples10m
WEST PFUs: SEM and IBA measurements of full-scale tiles
Besides front surfaces, tile side faces (=gaps) can be measured + areas in between core samples
Pending tasks: (i) C3 and C4 gap data analyses, (ii) ITER-like PFU data analyses, (iii) C5 marker-tile measurements --> should be available for VTT cutting in the end of the year
W7-X samples: focus on OP2.1 and 2.2 phases
(i) Marker samples with W + 600 nm Mo + 100 nm W coatings for erosion studies at inner heat shield, (ii) after the campaign analysis of deposition patterns on standard water-cooled tiles, (iii) W heavy-alloy TDUs in the baffle region, (iv) C-coated TZM screws
OP2.1 in late 2022, maybe some samples will be out in 2023 for analyses (decision only to be made in the next months) --> otherwise only after 2024
In the meantime: B deposition studies using the midplane manipulator as well as erosion during GDC or due to CX neutrals, again using manipulator
CP: water-cooled tiles from the divertor can only be taken out after many years and campaigns --> might be beyond FP9
CP: is dust an issue based on WEST results? It has to be considered, at least, because delamination of thick deposits may occur
09:40
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09:55
Status of W7-X samples availability in 2022 and plans for analyses in different labs15m
13C analyses of OP1.2B samples as well as composition of deposits; 16 out of 20 TE elements cut and measured --> next step is calculating 13C amounts and receiving W7-X mapping data (so far relative deposition patterns are available)
NRA vs. LIBS comparison made
Interesting to compare the results with those from other groups --> action on AH
Questions: (i) LIBS wavelength for B measurements --> to be clarified by Marcin; (ii) to be clarified if samples can be sent around to Pavel for LIBS studies.
09:55
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10:05
IPPLM activities in 2022 on WEST and W7-X samples10m
Interested labs: VR (Per Petersson), RBI (Iva Bogdanovic Radovic), NCSRD (Konstantina Mergia), besides FZJ, MPG, and VTT; status of JSI to be clarified
Action on all to add their names in the list of contributors of the proposal (link in the presentation)
10:15
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10:30
Status of AUG samples availability in 2022 and plans for analyses in different labs15m
AUG He campaign 2022 --> all OK --> next meeting in first week of April
AUG deposition cracks --> campaign integrated, interesting crack networks seen (mainly SEM and CLSM, also some metallography involved) --> PSI 2022 by V. Rohde for first results
Continuation of 2021 samples analyses --> PSI 2022 as the target
New melt experiment in 12.04.2022 --> pre-characterization done
Karl: W samples being transported into FZJ (PSI-2 exposure + FIB trenches) and graphite samples to be sent to VTT on Monday
Intrinsic Mo impurity always available but at least we have avoided Mo samples next to fuzz samples
GDOES measurements of WEST samples; noticeable is B and O contents as well as XPS-GDOES comparison
XRF measurements may help in surface contamination studies
Martin: put the focus on measuring the thickness of entire W coating, not only the marker (which is largely eroded); analyses can be extended into standard tiles (dozens of tiles available in stock...) --> action on Emmanuelle and Edi to discuss
10:55
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11:00
1-slide summary of NCSRD activities in 20225m
Speaker:
Konstantina Mergia(National Centre for Scientific Research “Demokritos”)