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Slide 1 - Boundary Physics Breakout Session was a Good Start Breadth of topics: many issues pointed out in three plenary talks: pedestal, SOL/div/PFC, and technology, were discussed Received substantial email input from individuals Appreciation that many phenomena (e.g. large ELMs, disruption, wall retention) are nuisances easy to cope with in today’s experiments, but not so for ITER and even worse for reactor Underscores the substantial nature of the boundary physics challenges in the step to ITER Group heard talks through lunch time, and thru a joint session with MHD on ELMs and disruptions, and came to some high level agreement on structure in discussion section
Slide 2 - Insightful Talks in the Boundary Physics Breakout Session A. Leonard - “Boundary Physics Issues – View from the Pedestal Outward” D. Whyte - “Boundary Physics Issues – the View from the PFCs Inward”   G. Bateman for CS Chang - “Role of the Center for Plasma Edge Simulation in Burning Plasma Research and Its Response to BPO questions.” P. Snyder for T. Rognlien - “Role of the Edge Coordinating Committee in Burning Plasma Research and Its Response to BPO questions.” J. Brooks - “PFC Community Response to the BPW Questions” G. Tynan - “UCSD MFE Experimental Program Group Response to the BPW Questions” L. Zakharov- “The Lithium Wall divertor Solution for ITER vs. the Present High Recycling Divertor” M. Kotschenreuther – “Does Divertor Control the Fate of Fusion?” C. Skinner - “Boundary Physics in the ITER Era” L. Baylor - “Fueling Needs and Capabilities for ITER Burning Plasmas” D. Dippolito - “Importance of Edge Physics in Optimizing ICRF Antenna Performance” D. Hillis - “Need for a Strong US International Collaboration Program to Address Burning Plasma Relevant Issues” D. Hill - “The Role of the USBPO in Boundary Research during the Next Decade”
Slide 3 - Productive Joint Session with MHD Group and Final Discussion within Boundary Group Joint session with Macroscopic Stability Group: “ELMs and Disruptions” ELMs 1-2 PM P. Snyder – review on ELMs M. Fenstermacher – “Control of the Pedestal and ELMs with Resonant Magnetic Perturbations and Research Needed toward a Burning Plasma Implementation” Disruptions 2-3 PM D. Whyte – review on disruptions J. Wesley – “Disruption Research Needed for Burning Plasma Preparation” Breakout group leaders appreciated the timeliness of a near term Task Group for design of the Resistive Wall Mode Coils and the Resonant Magnetic Perturbation Coils for ITER (not discussed in boundary group, however – no time) Formulation of answers to charge questions 3:15 PM (needed more time)
Slide 4 - Q#2: What issues remain to be resolved for a successful BP experiment in ITER List of important topics (priority and exact wording not agreed on) Qualification of ITER PFC design, and research toward PFC staging strategy T retention and removal, including SOL transport Disruption mitigation Pedestal and ELM physics and control H-mode power threshold Plasma start-up, path to nominal regime, plasma shut-down, and afterglow phase Power exhaust Particle fueling and exhaust Long pulse operation (wall conditions) Fast particles loss to the wall Diagnostic integrity with baseline operation Remote handling capability in real situation RF-edge plasma interactions
Slide 5 - Q#3: What are the consequences of resolving these issues, or not, in the next ~10 years? Reduction of ITER performance and/or premature periodic stoppages for PFC cleaning or replacement!.
Slide 6 - Q#4: What issues should be resolved by a successful BP experiment? Q5: What contributions can/should the U.S. fusion program make to resolve these issues? Not much dialog on these questions, because discussion of question #2 guided us to focus on Q#6, to discuss the framework of how we would decide on these two issues.
Slide 7 - Q#6: How should the BPO be structured to best help the community make these contributions? Two proposals for boundary structure within BPO: Single boundary group with goal of integrated science, with sub-groups in pedestal physics, SOL and divertor physics, and materials and PFC research Pedestal physics would have analog to ITPA pedestal group SOL and divertor physics would have analog to ITPA SOL and divertor group Materials and PFC research would have analog in existing PFC program under VLT Three separate high level groups in pedestal physics, SOL and divertor physics, and materials and PFC research Hand vote showed proposal of 3 separate high level groups was favored by majority between 2:1 and 3:1 Task forces could be formed by recommendation of working groups or research council (RC), pending approval by RC
Slide 8 - Possible BPO Structure R. Fonck, PPPL, Oct. 12, 2005
Slide 9 - Possible Boundary Physics Structure within the BPO Boundary Physics Goal: Integration Leader, Deputy Sub-Group Pedestal Physics Sub-Group SOL and Divertor Sub-Group Materials and PFCs Volunteers register at web site Concern about isolation of pedestal physics from other groups
Slide 10 - Possible Boundary Physics Structure within the BPO Preferred by Majority of Attendees Group Pedestal Physics Leader, Deputy Group SOL and Divertor Leader, Deputy Group Materials and PFC Research Leader, Deputy Volunteers register at web site Concern about ability to attack science issues regarding integration Task forces formed by recommendation of groups or research council, and approval by RC