Low-Te/high-ne D plasmas in MAGNUM-PSI --> influence of seeding impurities, are they entrained in the plasma beam, and what happens to eroded W in MAGNUM-PSI conditions?
Target, witness plate and insulator next to each other --> QCM and spectrocopy for gross erosion, RBS and XRF, NRA, TDS for post exposure analyses
Sebastijan: witness plate could have a marker layer, maybe markers also on the insulator
Marek: but markers may change thermomechanical properties? However, multiple samples so some may have marker layers, some not
Per: implantation as a marker? Or FIB cuts --> collaboration with FZJ!
4
ENEA activities in 2021: Effective sputtering yields of W model systems in GyM – plans and capabilities
GyM experiments: low Ti and flux 1021, manipulator system for exposing 4 samples simultaneously --> W model systems with varying morphologies (columnar and porous layers by PLD, also Laura's W-graphene heterostructures, also similar roughness samples as those produced for PFC)
First experiments foreseen in He --> morphology evolution as well as data for simulation efforts (in SP D)
Spectroscopy, weighing, SEM, AFM, QCM --> anything else?
Marek and Sebastijan: motivation for the work? in reactor we know that instead of nice and shiny pure W, we will have something else, including impurities and evolving morphologies; how about some witness/catch-up plates --> deposited material; think also about FIB cuts
Ion-beam analyses, also TEM analyses of relevant meshes missing --> Action on AH
5
ENEA activities in 2021: Hypervelocity dust impacts – plans and capabilities
PSI-2 experiments --> erosion/re-deposition of W (poly and single crystalline), using spectroscopy
Sputtering of W, re-deposition on witness plates (Mo, Ta), different geometries (big vs. small targets and catchers) foreseen as well as roughness levels
7
ÖAW activities in 2021: Effective sputtering yields of W model systems – plans and capabilities
Collaboration with VR, samples with W coatings on top, lab system with an ion source and QCM; catcher system recently upgraded to be usable for both erosion and deposition studies
#1: create and characterize re-deposited layers, #2: experiments on W, #3: experiments on W with re-deposits
Sebastijan: how rough surfaces can be modelled using SPRAY? Depends on the geometry! Recommendation to connect to other codes under SP D.
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VR activities in 2021: Characterization of samples from laboratory erosion and dust experiments – plans and capabilities
Ion beam analyses --> collaboration with ÖAW and ENEA; ENEA side mainly related to the dust samples (if needed)
RBS, TOF-ERDA, PIXE, NRA (but focus not so much on retention here); MEIS and LEIS available
Sebastijan: analysis capabilities table to be updated --> action on AH (also size, weight, Be, radioactive materials capabilities) --> together with Jari
Sebastijan: isotope-enriched W, can isotopes be distinguished? Quite tough, mainly AMS or SIMS are left! How about micro-NRA resolution? a few microns, typical system
9
IAP activities in 2021: Be and W dust formed during air and water leaks – plans and capabilities
Lungu for Be dust, Acsente for W dust; target to characterize dust properties in off-normal conditions (water or air leaks)
Analysis tools: EDX, SEM, XPS, TDS; 2021 target is to increase H2 content (W dust part)
Marek: what has the produced dust to do with tokamaks? Try to mimic what has been created in JET (publications pending!) --> discharges to be brought closer to fusion-reactor conditions
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Discussion on tasks and identification of gaps
Francesco: where to place catcher plates for dust in GyM? Consult modellers for most suitable places!
Francesco: surface roughness important, to be fully analyzed, single parameter not enough (also an issue for tokamak samples)
Marcin: FIB markers --> organize a separate meeting --> action on AH
Dina: can assist with ion-beam analyses of GyM samples --> action on AH
