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ERO code development

ERO code development. A. Kirschner M. Airila, D. Borodin, S. Droste, C. Niehoff.  The ERO code  ERO code management Modelling of CH 4 puffing in ASDEX  Modelling of CH 4 puffing in JET. The ERO code.  3- dimensional (at present 2D for divertor), Monte Carlo

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ERO code development

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  1. ERO code development A. Kirschner M. Airila, D. Borodin, S. Droste, C. Niehoff •  The ERO code •  ERO code management • Modelling of CH4 puffing in ASDEX  Modelling of CH4 puffing in JET

  2. The ERO code  3-dimensional (at present 2D for divertor), Monte Carlo  Various experimental geometries are possible (at the moment: TEXTOR, ASDEX, JET, ITER, PISCES, MAGNUM) Plasma-wall-interaction: - physical sputtering, chemical erosion (CH4 or higher hydrocarbons) - C-deposition from background, re-deposition of eroded particles  Local particle transport: - ionisation, recombination, dissociation - Ehrhardt/Langer or Janev data for CH4 reaction chain - friction (Fokker-Planck), thermal force, Lorentz force, diffusion D

  3. ERO code management (1) “Main line of development” CVS parallelisation ERO.LIM Variety of versions ERO.DIV ERO.LINEAR Several users and developers: version controlling necessary CVS (Concurrent Versions System) – server at FZJ

  4. ERO code management (2) Development of user friendly interface (“JERO”) in combination with ERO internet webpage

  5. Modelling of 13CH4 puffing in ASDEX (1) B2-Eirene grid of divertor region Z [m] 80° rotation ERO simulation volume R [m]

  6. Modelling of 13CH4 puffing in ASDEX (2) separatrix ERO simulation volume (outer divertor):

  7. Modelling of 13CH4 puffing in ASDEX (3) Plasma parameter (L mode) from B2-Eirene (D. Coster) separatrix

  8. Modelling of 13CH4 puffing in ASDEX (4) Transport of injected CH4 into outer divertor @ s=48mm: sticking assumption for hydrocarbons S = 0 80 mm CH4 CH2 CH CH4 0 0 80 mm CH+ C C+

  9. Modelling of 13CH4 puffing in ASDEX (5) SEP  PFR SOL  C-Deposition from injected CH4 (@ 48mm) into outer divertor: sticking assumption for hydrocarbons S = 0 local deposition: ~70%, losses to PFR: ~30%

  10. Modelling of 13CH4 puffing in ASDEX (6) Injection of CH4 (@ 48mm and88mm) into outer divertor: Puffing location deeper in SOL: high local re-deposition even if with S = 0!!!

  11. Modelling of 13CH4 puffing in ASDEX (7) Further 13C transport modelling in ASDEX: in co-operation with M. Airila (Helsinki University of Technology)

  12. Modelling of CH4 puffing in JET (1) ZC [cm] ne [cm-3] Te [eV] ZC [cm] -130 -130 -140 -140 -150 -150 -160 -160 -170 -170 -180 -180 220 220 260 260 230 230 240 240 250 250 RC [cm] RC [cm] MkIIA: Standard gas fuelled ELMy H-mode, 12 MW (#44029)

  13. Modelling of CH4 puffing in JET (2) • Zero sticking of hydrocarbons CDy, Ehrhardt-Langer • Location of injection: strike point Profiles of re-deposition for various incoming ion fluxes: Amount of re-deposition: 88% 89% 87% base plate vertical plate

  14. Modelling of CH4 puffing in JET (3) • Zero sticking of hydrocarbons CDy, Ehrhardt-Langer • Location of injection: center of base plate (SOL) Profiles of re-deposition for various incoming ion fluxes: base plate Amount of re-deposition: 76% 72% 66% vertical plate

  15. Modelling of CH4 puffing in JET (4) Summary: re-deposition of injected CD4 and C2D4 Injection at strike point: Injection at center of base plate (SOL): • No significant difference in re-deposition of puffed CD4 and C2D4 • Puffing at strike point: no significant dependence on flux • Puffing at center of base plate (SOL): decreasing re-deposition with increasing flux

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