WIMAS-2 Weekly Meeting

Wednesday 16 Sept 2020, 10:00 → 11:00 Europe/Berlin

https://kth-se.zoom.us/j/7764082514

Thomas Jonsson

WIMAS-2 Weekly Meeting are technical meetings to plan and coordinate the development of the ETS-6 workflow.

 

Remote participation:

https://kth-se.zoom.us/j/7764082514

10:00 → 10:10 Actions from last meeting

https://docs.google.com/spreadsheets/d/1Ps-cGQyKNsYTObCr5Kqu58bXBNQdH45Fjpz5QD0hLB0/edit?usp=sharing

Speaker: Thomas Jonsson

Solver FEM2 issues - work begun by Anna

BDS - (NEOWES) Not sure whose responsibility it was to run testing - not clear on how to run with impurities

TJ - want NEOWES in ETS6

PS - crashed so removed for now (ETS6)

Discussion on what data BDS needs in terms of impurities

BDS - Need to run (test) NEOWES in ETS without impurities

PS - Qualikiz issues, moving to NAG-less version. Depends on Qualikiz internal work (DIFFER and CCFE). Concerned to be putting resources into things that are progressing out of our control.

ACTIONS:

• TJ to send test case to DC
• DC to create documentation on how to use impurities in IMAS based on this test case

10:10 → 10:20 ETS-6 News

Speaker: Thomas Jonsson

Merged branches:

• database_sources_and_transport - more identifiers added and some allocation checking added; needed for ITER modelling.
• database_equilibrium - for interpretative equilibrium (from Daniel).

New tag:

• 0.0.3 == master == develop, 15 September 2020

Not yet merged:

• merging_from_revise_impurity - from Denis and Irena, plus fixes of issues found.
• bulk_rotation - implemented before the summer break, but never merged. Include major changes in the ets_init code parameters.
• pinchVelocity - old one; require testing.

 

10:20 → 10:50 Impurities in the ETS-6

Speaker: Thomas Johnson (Fusion Plasma Physics (KTH/VR))

Impurities in the ETS-6.pptx

Impurities in the ETS-6

Impurity actor needed. Irena’s FORTRAN exists but needs to be wrapped so it can be integrated into the ETS-6.

Lackner scheme is NOT implemented in solver at present.

DC - See paper about where to implement Lackner scheme, http://zfn.mpdl.mpg.de/data/Reihe_A/37/ZNA-1982-37a-0931.pdf

DECISION: The temperature of the impurities should be calculated from the ratio between the total main ion pressure and the total main ion density. This option is already implemented.

DECISION: The present code parameters for the impurities in the ets_init are sufficient for the time being. But make minor changes

• Rename the option 'renormalisation' to something that clarifies that this refers to Corona equilibrium
• There are more than one interpretative mode; we need implicit for each state and implicit total density with coronal-split between charge state.
• Add documentation of these options.

DC - If we want to add bundling later on it'll be straight forward, but it's not a priority.

DC - Note that an edge models might change the boundary conditions

Lackner Scheme

Alexei - Why are neutrals not part of the Lackner scheme.

• Answer DC - neutrals treated by separate models - pushed to the future

Strategy as proposed by David Coster: 
From the source terms for ionisation and recombination the rates can be calculated in the solver be dividing by the relevant densities. Since the rates do not depend on the ion densities the Lackner scheme can be evaluated using these rates. However, the top priority should be to get something working. The implementation of the Lackner scheme is a later concern.

10:50 → 11:00 Any other business

Upcoming sprint session Thursday and Friday on internal boundary conditions and hyperdiffusion.