Prescriptions for Running EMC3-Lite for Finite Beta Configurations
EMC3-Lite is utilized for solving specific W7-X finite beta cases, with tweaks such as extending reference mesh and breaking up toroidal zones. Explore error solutions, additional zones, and high-iota configurations in plasma physics development.
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Prescriptions for Running EMC3-Lite for Finite Beta Configurations Amit Kharwandikar This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. MAX-PLANCK-INSTITUT F R PLASMAPHYSIK | AMIT K | 23.04.24 DIVERTOR CONCEPT DEVELOPMENT - PHYSICS ISSUES 1
Background VMEC+Extender outputs can be run in EMC3-Lite via xdr files Automated 3D grid generation and solving heat conduction supported However, to solve some specific W7-X finite beta cases, tweaks may be needed: 1. Extended Reference Mesh 2. Additional toroidal zones 3. Additional targets MAX-PLANCK-INSTITUT F R PLASMAPHYSIK | AMIT K | 23.04.24 DIVERTOR CONCEPT DEVELOPMENT - PHYSICS ISSUES 2
Reference Mesh Extension Error 1 : Issue : LCFS or Inner S located inside the inner Boundary of Reference mesh Solution: Extend the reference mesh radially inward MAX-PLANCK-INSTITUT F R PLASMAPHYSIK | AMIT K | 23.04.24 DIVERTOR CONCEPT DEVELOPMENT - PHYSICS ISSUES 3
Additional Zones Error 2: Mapping Loss (Loss of power), Power in SOL Power deposited on targets EMC3-Lite relies on constructing flux tubes from points of reference mesh and mapping ? = 0 ? = 36 For highly chaotic fields, flux tubes reaching the other plane can be distorted Issue : Such flux tubes ignored -> Monte Carlo particles deleted = Power lost Solution : Break up the toroidal domain into 2 symmetric zones (0 to 18, 18 to 36) Makes it less likely for chaos to distort flux tubes! MAX-PLANCK-INSTITUT F R PLASMAPHYSIK | AMIT K | 23.04.24 DIVERTOR CONCEPT DEVELOPMENT - PHYSICS ISSUES 4
High-iota Configuration 3% <?>vol ? = 1 ?2/? (with 1 zone ) (with 2 zones ) Total power into SOL : 1.0000E+06 Power depo on targets: 8.0891E+05 Pall. domain boundary: 1.9105E+05 % P_lost (W): 19.1 Total power into SOL : 1.0000E+06 Power depo on targets: 9.6012E+05 Pall. domain boundary: 3.9831E+04 % P_lost (W): 3.99 MAX-PLANCK-INSTITUT F R PLASMAPHYSIK | AMIT K | 23.04.24 DIVERTOR CONCEPT DEVELOPMENT - PHYSICS ISSUES 5
High-iota Configuration 3% <?>vol ? = 6 ?2/? (with 1 zone ) (with 2 zones ) Total power into SOL : 1.0000E+06 Power depo on targets: 5.7402E+05 Pall. domain boundary: 4.2518E+05 % P_lost (W): 42.6 Total power into SOL : 1.0000E+06 Power depo on targets: 8.8521E+05 Pall. domain boundary: 1.1311E+05 % P_lost (W): 11.5 MAX-PLANCK-INSTITUT F R PLASMAPHYSIK | AMIT K | 23.04.24 DIVERTOR CONCEPT DEVELOPMENT - PHYSICS ISSUES 6
Additional Targets High iota strike line extends until the heat shields Including wall and heat shields resolves power balance to 99% 190 out of 200 finite beta + toroidal current cases resolved; 10 to be investigated MAX-PLANCK-INSTITUT F R PLASMAPHYSIK | AMIT K | 23.04.24 DIVERTOR CONCEPT DEVELOPMENT - PHYSICS ISSUES 7
