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ELM Control in ITER: Challenges and Mitigation Strategies for Optimal H-Mode Performance

This document addresses the critical issues related to Edge Localized Mode (ELM) control using pellet injection and resonant magnetic perturbations (RMP) in ITER. The primary goal is to establish effective ELM mitigation techniques without degrading pedestal and H-mode performance, aiming for Q=10 plasma. Key concerns include the placement of ELM control coils, fueling and pumping capabilities under increased gas loads due to pellet pacing, and achieving a wide operational window for all ITER scenarios. We explore operational dependencies on resonant conditions and penetration depth optimizations.

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ELM Control in ITER: Challenges and Mitigation Strategies for Optimal H-Mode Performance

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  1. Issues in ELM control using pellet and RMP Final goal: to establish ELM mitigation technique with • No degradation of pedestal and H-mode performance to achieve Q=10 plasma • Compatibility with ITER hardware • Location of ELM control coils (urgent issue in ITER DR8. “Assure that space for ELM control windings is reserved”) (ITER coil issues: Tuesday afternoon) • Fueling/pumping capability (urgent issue in ITER DR9. “Impact of increased gas loads due to pellet pacing on pumping systems affecting building size”) • Wide operational window covering all ITER scenarios

  2. Operational windows depend on resonant condition=> Can we operate any q95 value in ITER?=> How to maximize/optimize operational windows?

  3. Sugihara et al, JSPF meeting in 2006 Operational windows depend on penetration depth=> How robust is minimum lp/Dped?=> Is it possible to reduce lp/Dped?

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