SP B.1 + SP B.4 kick-off meeting 2023
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Europe/Berlin
Description
Join Zoom Meeting
https://us02web.zoom.us/j/82333954470?pwd=OUNRaFFsY0dVQXpiMGpxZFpqbzR1QT09
Meeting ID: 823 3395 4470
Passcode: 656099
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Overview of SP B, SP B.1 and SP B.4 in 2023Speaker: Antti Hakola (TEKES / VTT)
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Erosion experiments in MAGNUM-PSI in 2023Speaker: Thomas Morgan (Dutch Institute for Fundamental Energy Research)
- 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
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Erosion experiments in GyM in 2023Speaker: Andrea Uccello (ENEA)
- 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
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Erosion experiments in PSI-2 in 2023Speaker: Oleksandr Marchuk (FZJ)
- 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
- 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
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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)
- Main scientific questions for cross-machine erosion experiments to be clarified
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Production of W samples for lab and linear-machine experimentsSpeakers: David Dellasega (ENEA), Dr Eduard Grigore
- 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
- Milan: produce compact and porous coatings including pyramidal samples for different experiments
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Production of Be samples for lab experimentsSpeaker: Corneliu Porosnicu (IAP)
- 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
- Be reference coatings to be produced according to a somewhat reduced work plan
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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
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Erosion experiments in laboratory conditions in 2023Speaker: Martina Fellinger (OEAW)
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Overall discussion
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Final remarks and future actionsSpeaker: Antti Hakola (TEKES / VTT)
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