Name: SP B monitoring meeting 2024
Start: 2024-10-17T13:00:00+02:00
End: 2024-10-17T16:00:00+02:00
Location: No location set

- 1
  
  Overview of SP B in 2024 - summary of activities and work against deliverables
  
  Speaker: Antti Hakola (TEKES / VTT)
  
  SP B_Status_2024_Hakola.pptx
- 2
  SP B.1 - Exposure of W samples to PSI-2 plasmas
  
  Minutes
  
  Speaker: Oleksandr Marchuk (FZJ)
  
  PSI-2_2024_Marchuk.pptx
  New high-resolution spectroscopy system available in PSI-2 and measured W spectra analysed + modelled --> paper submitted
  First B layers exposed to PSI-2 and measured spectra analysed; also B-H lines observed + O and other elements --> to be revisited!
  Comparison exercise --> previously observed high erosion rates due to Ar2+ ions, sputtering by heavy impurities and problems in estimating ion flux on the target? --> now with new exposures (and altered parameters) more reasonable erosion estimates obtained --> ready to move to next phase! (and check the data with Ne)
  Next steps: repeat the exercise with Ne, then proceed to other W samples
- 3
  SP B.1 - Influence of dust impacts on W coatings
  
  Minutes
  
  Speaker: Dr Marco De Angeli (ENEA-CNR Milan)
  
  SP B_Monitoring_Meeting_Dust_2024.pdf
  Report on the different regimes upon response to dust impacts: deformation, disintegration or dust becoming bound on the surface --> depends on the coating properties and velocity of dust particles --> also native oxide layers on (W) surfaces can change the behaviour - but no boundary effect for coatings
  New samples produced in 2024: samples with half pristine, half coated surface + further studies performed
  Next steps: impact of oblique incidence and target + dust temperature on delamination shape; effect of coating thickness on delamination?
  Open question: response of B layers to dust impacts? But is this relevant in a reactor?!
- 4
  SP B.2 - Overview of PWI activities in W7-X
  
  Minutes
  
  Speaker: Chandra Prakash Dhard (IPP)
  
  WPPWIE-SPB-midterm-20241017-Dhard.pdf
  Several PWI activities done on W7-X in recent years --> overview of the efforts visible
  Dust analyses ongoing --> many elements identified; melting studies also mentioned
  Scheduling visits to W7-X --> discuss with CP
- 5
  SP B.2 - Erosion experiments on W7-X and related surface analyses
  
  Minutes
  
  Speaker: Matej Mayer (IPP)
  
  SP B_Monitoring_Meeting_Mayer.pptx
  Boronization layers analysed from (i) W-coated wall tiles and (ii) MPM samples --> thickness and homogeneity determined, O gettering capacity 0.5-0.9 O/B
  10-60 nm of B after a campaign, 5-15 nm after an individual boronization --> thin layers; how about exposure to air --> that may be an issue
  Next steps: sticking coefficient of B-H radicals? cavity samples --> challenging! comparable task on AUG!
  Also thick W7-X deposits being analyzed
- 6
  SP B.2 - Overview of WEST tile analyses
  
  Minutes
  
  Speaker: Dr Mathilde Diez (CEA)
  
  DIEZ_WEST_activities_in_2024_PWIE.pptx
  Summary of the WEST PWIE activities --> see the slides for details & minutes from the Cadarache meeting in July
  New in 2024: study the effect of ripple on the erosion pattern --> to be continued also in 2025 (MPG, CEA, IAP, others?)
  New in 2024-2025: studying deposits from high-fluence campaigns --> include into analysis programme in 2025
  New in 2025: analysis of monoblock samples; Phase 1 samples cut and ready to be shipped outside of CEA
  Next steps: publications (IAEA, PFMC - He results) + which labs can analyse full tiles + monoblocks
- 7
  SP B.3 - TOF-ERDA analyses of WEST samples
  
  Minutes
  
  Speaker: Ivancica Bogdanovic Radovic (RBI)
  
  PWIE monitoring meeting 2024_IBR.pdf
  Review of TOF-ERDA results --> comparison C3-C4-C5 --> most interesting comparison for He and B and W
  New in 2024: TOF-ERDA measurements of monoblock samples --> He profile extracted
- 8
  SP B.3 - Surface analyses of WEST monoblock samples
  
  Minutes
  
  Speaker: Konstantina Mergia (National Centre for Scientific Research “Demokritos”)
  
  PWIE_SPB.3_Monitoring_Meeting_Demokritos_17Oct24_FINAL.pdf
  Summary of results obtained from MB28 - deposits and fuel retention profiles + overview of morphology
  Lower retention compared to the marker tiles --> reasons for this?
  Discussion on "humps" --> also seen on other machines
  Next steps: publishing the results
- 9
  SP B.4 - production of W reference samples
  
  Minutes
  
  Speaker: Prof. David Dellasega (ENEA)
  
  Dellasega_ deposition_MM24_def2.pdf
  Review of W films produced in 2024 - for LIBS campaigns and linear-machine experiments
  New in 2024: nanocolumnar W films (crystalline rods) --> first attempts resulted in tilted rods while the Madrid teams had a different outcome --> largely dependent on critical parameters
- 10
  SP B.4 - production, characterization, and exposure of B reference samples
  
  Minutes
  
  Speaker: Anne Houben (FZJ)
  
  SP_B_1024_ahouben.pdf
  B layers produced and characterized (magnetron sputtering) --> B layers appear to detach from their W substrate (due to W oxide?) --> best to anneal W substrates before deposition and keep in vacuum (similar effect on steel but only after several months --> humidity effect)
  B erosion in PSI-2 --> erosion rates 0.26-0.43 nm/s (PSI-2 beam profile), quite consistent for long-term and short-term exposures (rate can increase up to 0.6 nm/s) - these obtained by spectroscopy!
  Next steps: comparison to layers produced by other groups
  Possible follow-up exercise: chemical erosion of B layers? Sabina can study this
- 11
  SP B.4 - production and characterization of B reference samples
  
  Minutes
  
  Speaker: Eduardo Pitthan Filho (VR)
  
  SPB_Pitthan_2024_indico.pdf
  B films produced by magnetron sputtering on W substrates --> layers appear to be stable but they can change color upon exposure to air (in minutes)
  Collection of data from W-B mixed layers and pure B coatings; proposal to carry out in situ experiments on H/D desorption
  NB! aging effect considerable (formation of boric acid)
  Detailed analysis of the layers carried out, combining multiple IBA techniques recommended --> new methods available for B detection
  Next steps: participate in the comparison exercise proposed by Anne
- 12
  SP B.5 - Production of B and W dust particles
  
  Minutes
  
  Speakers: Dr Corneliu Porosnicu (IAP), Tomy Acsente (IAP)
  
  2 Reporting slides 2024 activities IAP - Bobi.pdf
  
  SPB5 Monit meet oct 2024 W_B MSGA A Tomy.pdf
  W dust particles: clear impact of deposition rate, D retention etc. by addition of water vapor on the production of nanoparticles; particles also become more "disconnected"
  B dust particles: produced using both magnetron sputtering (nanoparticles) and plasma arcing (big clusters) --> inclusion of H, N, and O changes the properties of dust particles + some notable differences compared to W dust
  Next step: comparing lab dust to dust coming from fusion devices + finishing the database
- 13
  
  Discussion
- 14
  
  Final remarks and actions
  
  Speaker: Antti Hakola (TEKES / VTT)