1. December 10-12, 2008/ARR 1 International HHFC Workshop on Readiness to Proceed from Near Term Fusion Systems to Power Plants ARIES Workshop UCSD, La Jolla, CA December 10-12, 2008 Background and Goals A. René Raffray University of California, San Diego Co-Organizers: Richard Nygren and Dennis Whyte

2. December 10-12, 2008/ARR 2 ARIES Town Meetings and Workshops The ARIES program organizes town meetings/workshops to provide a forum for discussions between scientists from R&D programs and power plant studies: -To help guide experimental programs towards solutions that lead to an attractive fusion power plant -To help design studies develop concepts that are consistent with the understanding of scientists developing those technologies. Consistent with ARIES mission statement: - Perform advanced integrated design studies of the long-term fusion energy embodiments to identify key R&D directions and provide visions for the program.

3. December 10-12, 2008/ARR 3 Past ARIES Town Meetings Have Proven Very Valuable Mar. 2-3, 1995ANLWorkshop on Liquid Target Divertors May 10, 1995ANLStarlite Town Meeting on Structural Materials Jan. 31, 1996UCSDStarlite Town Meeting on Low Aspect Ratio Spherical Tokamaks June 19, 1997UWARIES Town Meeting on Designing with Brittle Materials May 6-7, 1998UCSDARIES Town Meeting on ST Physics Jan. 18-19, 2000ORNLInternational Town Meeting on SiC/SiC Design & Material Issues for Fusion Systems Mar. 6-7, 2001LivermoreARIES Tritium Town Meeting May 5-6, 2003LivermoreARIES Town Meeting on Liquid Wall Chamber Dynamics Sept. 15-16, 2005PPPLARIES Compact Stellarator Physics Town Meeting Starlite ARIES-RS ARIES-ST ARIES-AT ARIES-IFE ARIES-CS

4. December 10-12, 2008/ARR 4 Example of Recent Town Meetings SiC/SiC Town Meeting, January 2000 Objective:To bring together the international SiC/SiC design and materials communities to exchange information, identify design-related critical issues, discuss latest R&D results, and provide guidelines to help focus future effort (reference properties, R&D goals, etc.) Organizers:M. Billone, R. Raffray Attendance: EU (5), Japan (9), US (17) Major Output: Bring material and design communities up to date with latest developments in the field; identify major material issues from design perspective; recommend most appropriate values of properties to be used in design studies. (FED journal article: Design and Material Issues for SiC f /SiC-Based Fusion Power Cores) http://aries.ucsd.edu/LIB/MEETINGS/0001-SiCSiC/ Liquid Wall Chamber Dynamics Town Meeting, May 2003 Objective: To bring together experts in the liquid chamber dynamics areas to identify the major issues, share the latest results, understand better the accuracy of (and any differences among) various modeling predictions and, through discussions, to help focus future R&D efforts (analyses and experiments). Organizers:W. Meier, R. Raffray Attendance: US (33) Major Output: Characterize major processes in IFE liquid wall chambers and their time scales; discuss status of current experimental and modeling capabilities and their accuracies; identify major issues and help guide R&D effort to address them. (FS&T journal article: IFE Thick Liquid Wall Chamber Dynamics: Governing Mechanisms and Modeling & Experimental Capabilities) http://aries.ucsd.edu/ARIES/MEETINGS/0305-LW-TownMeeting/

5. December 10-12, 2008/ARR 5 Background and Goals of Workshop A topic of high current interest is the apparent disconnect or gap between near term and long term concepts for high heat flux components (HHFC, and in particular divertors). This is the focus of this workshop aimed at: -better characterizing the international status of current HHFC design concepts for power plants -comparing it to the present stage of development and experimental information for near term concepts (ITER-like); -better understanding how to evaluate where we are with respect to the end goal (power plant HHFC concepts) and what needs to be done to get there. The question carries also of course an important physics aspect in realistically determining the expected physics regime of operation in a power plant and the corresponding heat and particle fluxes on the divertor, and an important material aspect in designing the HHFC's for accommodation of the threats from the fusion environment. This topic is also now of particular interest in the USA as it relates to the work being done as part of the ReNeW effort. -The objective of the ReNeW project is to help OFES develop a plan for US fusion research during the ITER era, roughly the next two decades. - It is hoped that the outcome of the present workshop will provide some useful information

6. December 10-12, 2008/ARR 6 Organization of Workshop The workshop will include five different sessions focusing on: 1. Near term HHFC design and R&D (ITER) 2. Long term HHFC concepts (Power plants) 3. Material aspects for near term and long term concepts (development/fabrication/joining and plasma interaction testing aspects) 4. Physics considerations for near term and long term concepts 5. Evaluation methodology to evaluate current readiness level vis- à -vis the long term objective and how to get there Ample discussion time is included to discuss these and also how to bridge the readiness level gap. Session coordinators will summarize key issues and discussion points for close-out discussion. Proposed publication summarizing the key findings from the workshop.