Subgroup high beta, MHD limits, abrupt changes of plasma confinement [C. Brandt]

• plan for high-beta 1.7 T operation  TG-FI, TG scenarios
• high-mirror configuration is favourable for NBI heating (improved heating capability in NBI and ECRH)
• proposals will be necessary to prepare high-beta configuration
• physics:
• pellet dynamics & plasma response
• stability and extended high performance phases

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