SP B.1 + SP B.4 kick-off meeting 2023

Friday 3 Mar 2023, 13:00 → 16:00 Europe/Berlin

Join Zoom Meeting
https://us02web.zoom.us/j/82333954470?pwd=OUNRaFFsY0dVQXpiMGpxZFpqbzR1QT09

Meeting ID: 823 3395 4470
Passcode: 656099

1 Overview of SP B, SP B.1 and SP B.4 in 2023

Speaker: Antti Hakola (TEKES / VTT)

SPB.1_SPB.4_Introduction_Hakola_030323.pptx

2 Erosion experiments in MAGNUM-PSI in 2023

Speaker: Thomas Morgan (Dutch Institute for Fundamental Energy Research)

Morgan_SPB-kick-off DIFFER v2.pdf

• In 2023, continue investigating the role of entrainment on W erosion and re-deposition balance; apply here predominatly Ar plasma
• Adopt on the agenda also the exposure of reference W layers (produced within SP B.4)
  • Size ~10 mm x 10 mm, layer should be relatively thick (~several microns) but discharge parameters can be tuned to reduce gross erosion
  • Implement also specific trenches on the samples (by FIB) to obtain more information on sputtering
• Additional help may be needed for post exposure analyses --> to be discussed in connection with SP B.2/SP B.3 kick-off meeting

3 Erosion experiments in GyM in 2023

Speaker: Andrea Uccello (ENEA)

Uccello_SPB1_KoM_2023.pdf

• The 2023 plans include continuing exposures of a variety of W or W+O (produced within SP B.4) samples in GyM
• Proposal: keep the flux and ion energy fixed and vary the fluence to reach the levels observed already in other linear facilities
  • Proposal to use Ar instead of He to reach conditions comparable to what is used in MAGNUM and PSI-2
• Post exposure analyses require assistance from other contributing labs --> to be discussed in the SP B.2/SP B.3 kick-off meeting

4 Erosion experiments in PSI-2 in 2023

Speaker: Oleksandr Marchuk (FZJ)

marchuk.pptx

• In 2023, work plan includes exposure of different types of W samples to PSI-2 plasmas (Ne, Ar, Kr) and studying erosion using laser absorption spectroscopy
  • Set focus on W reference layers produced within SP B.4 but start with bulk W and then proceed towards more complicated re-deposited W layers
  • PSI-2 geometry can be applied for all the contributing devices
• Balance between erosion and re-deposition would require specific considerations

5 Discussion on joint experiments and needs for samples

• Main scientific questions for cross-machine erosion experiments to be clarified
  • Determining absolute erosion rates? This is usually quite tricky
  • Study if erosion/re-deposition balance is independent of flux and only on fluence? But can this only bring forward subtle differences in machine geometries?
  • Investigate dependence of surface morphology  on erosion/re-deposition balance? Continuation of what has been initiated on PSI-2 some years ago
  • Generally investigate how differently W layers mimicking re-deposits respond to plasma from that of virgin W layers? May be a bit challenging from the technical point of view in some devices
• Action on AH to call for an additional meeting boiling around these questions
  • Involve also modellers from SP D into the loop for additional topics to be addressed
  • Target: April (before or after Easter)

6 Production of W samples for lab and linear-machine experiments

Speakers: David Dellasega (ENEA), Dr Eduard Grigore

Dellasega_Enea-Milan_SPB1+SPB4_KoM 2023_def.pdf

Grigore_Production_and_characterization_of_W_reference_coatings_IAP_KoM_03_23.pdf

• Milan: produce compact and porous coatings including pyramidal samples for different experiments
  • Morphology as a parameter for erosion experiments in linear devices and in laboratory conditions
  • Additional set of samples for hypervelocity dust impact experiments
• Romania: produce W reference coatings with different morphologies and later on W layers with different gas contents
  • As above, morphology as a parameter for erosion experiments in linear devices and for dust impact studies
  • Aim at thick layers to withstand also high-flux exposures

7 Production of Be samples for lab experiments

Speaker: Corneliu Porosnicu (IAP)

Production_of_Be_reference_IAP KoM 2023.pptx

• Be reference coatings to be produced according to a somewhat reduced work plan
  • Investigate influence of O (Be + O) on the structure and fuel content of the produced and annealed films --> continuation of the work initiated in 2021-2022 (incl. Raman)
  • Produce JET-relevant reference layers (=what we tend to see in post-exposure analyses)
• Longer-term plans (2024+) could include
  • Tritiated Be layers and application of LIA-QMS vs. LID-QMS for investigating their fuel retention/removal trends
  • W layers with different morphologies, produced using TVA and short-pulse HiPIMS

8 Discussion on sample needs

• Priority 1: samples for experiments in linear devices and lab conditions --> to be followed up in April-May
• Priority 2: samples for LIBS experiments - but this is on hold until we know more about if and how the LIBS@JET project makes progress --> to be followed up in April-May
• Action on AH to arrange a follow-up meeting in April-May once the Sample Master Excel is around and discuss on the analysis programme required for each sample

9 Erosion experiments in laboratory conditions in 2023

Speaker: Martina Fellinger (OEAW)

PWIE_SPB_Outlook_slide_2023_Fellinger.pdf

• Focus on NCW and pyramidal samples as extensively discussed in the PWIE meeting in Jülich
• Further enforces the idea that erosion and re-deposition balance with more complicated sample morphologies would bring added value

10 Overall discussion

11 Final remarks and future actions

Speaker: Antti Hakola (TEKES / VTT)