Subgroup MHD optimization: Investigation of plasma stability, equilibrium properties and core islands physics [J. Geiger, T. Andreeva]

• physics in the extended configurational space (ILD / UFM-like configurations with high mirror), possibly operation in 1.7 T
• configuration scans (iota, island size variation)
• poloidally rotate islands (identify localization of modes / tomography and TS-profile effects)
• zero out the 5/5 island with the control coils and drive a massive 1/1 with the trim coils.
• use of control coils for variation in the configurational space
• low shear configuration: suppresion of internal 5/5 islands is possible with main TF coils
• theory: prediction of criteria for safe ECCD operation (empirical: ~18 kA for EIM-config)
• impurity-induced temperature holes and their effect on plasma stability
• bootstrap: further configurations & validation neoclassically predicted dependencies (ECCD as bootstrap boost)?
• bootstrap current in low mirror configuration: large BS current, fast particles are not trapped near axis <--> TG-Turbulence