Chamber Subgroup Question #7 Comments

Steven Zinkle Wed 30 June 1999 14:37 Subject: Comment on Proposed Schedule Dear colleagues, Mike Billone and I have been assigned the task of organizing a critical discussion (and associated written document) for the upcoming Snowmass, Colorado fusion summer study on "Materials for Fusion Energy" (Chamber Science & Technology Key Question #7). As you are aware, the intention of the Snowmass workshop is to have candid discussions on the opportunities and directions for fusion R&D for the coming 10 years. A brief 2-page prospectus on the "Materials" topic was prepared a couple of months ago by Mike and myself, and posted on the Snowmass web site (see http://www.fusion.ucla.edu/snowmass/questions/prospectusCQ7.html). Since the Snowmass meeting will begin 13 days from now, we need to finalize the oral presentations and finalize a draft position paper which can be circulated for community comment. There are two Snowmass sessions scheduled for CS&T key question #7, on Thursday and Friday afternoon (between lunch and coffee break). Both of the sessions are 1 h 45 minutes long and are tentatively scheduled to be held in the Top of Village Meeting Room and Tent, respectively. As a draft presentation schedule, we envision that the various materials issues could be presented in the Thursday session (structural materials, plasma facing materials, solid breeding blankets, IFE materials, magnets...), and the Friday session could focus on a technical discussion of the critical R&D issues and program balance for the next ten years for the various materials. A draft schedule is pasted below for your comments. I would be grateful if the proposed presenters could let me know if they (or one of their colleagues) are willing and able to make a short presentation during this time. Also, please indicate whether you or your colleague would like to make a short presentation in the Friday afternoon discussion session (agenda items 4 and 5). I am sorry that we haven't contacted you earlier about these proposed presentations. In the next 1-2 days we will be distributing to you for comment a draft opinion paper on Materials. Sincerely, Steve Zinkle

Steven Zinkle Wed 30 June 1999 14:37 Subject: Proposed Schedule Proposed Agenda for Snowmass Materials Session (CQ7) Thursday, July 15, 1999, 1:30-3:15 pm, Top of Village Meeting Room 1. Structural Materials (Speaker: E. E. Bloom) The importance of structural materials R&D; the advanced materials program roadmap; critical feasibility issues for structural materials Time: 20 min. talk, 10 min. discussion 2. Materials Issues for Solid Plasma-Facing Components (Speakers: M. Ulrickson and M. Billone) Special requirements and operating conditions for plasma facing materials; design concepts; critical issues for C/C composites, W, Be; critical issues for solid breeder and multiplier materials (summary of CQ2, etc.). Time: 15 min. talk, 10 min. discussion 3. Liquid Metal/Salt Breeders and Coolants (Speaker: R. Moir/N. Morley/D. Smith?) Materials R&D requirements to support liquid metal wall concepts, critical materials issues for coolants under current consideration (summary of CQ1). Time: 10 min. talk, 5 min. discussion 4. Materials Needs for IFE (Speaker: L. L. Snead) Materials feasibility issues for laser-driven and heavy ion driven options; heat flux/temperature/radiation damage conditions; activation considerations; candidate materials. Time: 10 min. talk, 5 min. discussion 5. Magnet Materials (Speaker: L. Bromberg) Materials R&D needed to improve the performance of superconducting and dc resistive magnet systems (summary of PQ2). Time: 10 min. talk, 5 min. discussion Proposed Agenda for Snowmass Materials Session (CQ7) Friday, July 16, 1999, 1:30-3:15 pm, Top of Village Tent 1. Re-evaluation of Waste Materials Strategies (Speaker: D. Petti) Trade-off between waste hazard and waste volume; limiting the activation of vessel and magnets; should the low activation criteria currently used to guide materials selection be reevaluated? [Summary of CQ5] Time: 10 min. talk, 10 min. discussion 2. High Performance vs. Low Activation (Speaker: D. Steiner) Summary of Energy Working Group, Subgroup A2 discussions; what materials R&D would support the development of attractive fusion concepts. Time: 10 min. talk, 10 min. discussion 3. Experimental Facilities (Speaker: S. Zinkle) What are the key experimental facilities needed to ensure progress in materials R&D; what can be achieved and what are the limitations inherent in fission reactor facilities; at what stage will progress in materials R&D become limited by the absence of a neutron source. [Summary of CQ4] Time: 5 min. talk; 5 min. discussion 4. Anticipated Advances in Materials (Moderators: S. Zinkle/M. Billone) What state-of-the-art materials development could impact the development of materials for fusion applications? Some possible examples include: (a) stir-friction welding for field construction and in-situ repair of refractory metals, (b) development of oxide-dispersion-strengthened ferritic steels and copper alloys, (c) new non-structural materials such as KU-1 quartz, free-standing CVD diamond wafers, (d) high Tc superconductors, and (e) advances in computational materials science. Time: 15 min. 5. Addressing Key R&D Issues (Moderators: M. Billone/S. Zinkle) What are the potential impacts of current materials R&D programs on the development of attractive fusion concepts? Do the Advanced Materials and Technology Program roadmaps provide optional interaction between these R&D efforts? What is the proper balance and timing of activities in the areas of basic materials studies, development of engineering databases, and component testing? ; "strawman" tables will be generated before July 1 and distributed via email in order to initiate this process Time: 40 min. Steven J. Zinkle

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