U.S. Department of Energy’s Office of Science

1. U.S. Department of Energy’sOffice of Science Status of Joint Experiments Coordinated by ITPA & IEA IAs 2nd IEA LT Workshop on ITPA High Priority Research; Joint Workshop of Large Tokamak, Poloidal Divertor & TEXTOR IAs November 23, 2003; Naka, Japan Erol Oktay Member of IEA ExCos for TEXTOR, Large Tokamak, and Poloidal Divertor; ITPA Coordinating Committee June 4, 2003 www.ofes.fusion.doe.gov

2. We have made great progress in addressing high priority research (HPR) activities developed by the ITPA TGs The IEA LT ExCo offered to include specific ITPA HPR experimental proposals in its exchange program at the May 2002 meeting at PPPL. The IEA LT and the IEA Poloidal IAs held a joint Workshop with the ITPA CC and the leaders of the major tokamak programs at MIT in November 2002 to plan joint experiments on ITPA HPR in 2003. The IEA Poloidal Divertor ExCo invited the members of the IEA LT and IEA TEXTOR ExCo’s to its meeting at St. Petersburg in July 2003 to develop a position paper for IEA FPCC on ‘Streamlining/strengthening coordination between the three tokamak-related IEA IAs”, and to begin the planning of this workshop. This Workshop now also has additional tokamak programs Russia, China, and EU that use bilateral agreements for the exchange activities The Implementation of Joint Experiments has been very successful since its inception a year ago

3. The IEA IAs and the bilateral agreements provide a mechanism to carry out personnel and hardware exchanges in addressing the joint experiments, and to hold workshops. The real work, however, is carried out by the TGs and the scientific teams of the tokamak programs to identify and implement the joint experiments: The international tokamak community has been very responsive to this ‘experiment’ in coordination of experiments: Increased collaborations Carefully designed experiments to match shapes, parameters, etc. Productive results and joint publications Plans for future experiments The participation at this Workshop from almost all of the international tokamak community is a testament to the success of this activity, which will contribute effectively to our preparations for the ITER experiments in the future. The Implementation of Joint Experiments has been very successful since its inception a year ago (cont)

4. A total of 39 proposals were developed in the 7 TGs, of which 8 were programmatic activities without specific joint experiments: The tokamak programs incorporated most of the proposed experiments in their programs, and identified contact personsfor coordination. Participation in these first-year experiments has been primarily from the divertor tokamaks (AUG, C-MOD, DIII-D, JET); JT-60U contributed data to analysis, but did not operate to participate in new experiments. MAST and NSTX participated in some of the experiments to provide input from low-aspect ratio design, and TEXTOR in several proposals in TITB, DSOL, and MDC. The TG Chairs/Co-Chairs reported the results from the joint experiments at the ITPA Coordinating Committee meeting at General Atomics in October 2003. David will summarize these results. Almost all of the Proposals developed for JEX at the MIT meeting received attention in 2003

5. Different tasks are involved in addressing the technical issues in the proposals: Carry out new ‘joint’ experiments among two or more tokamaks, with similar shapes, non-dimensional parameters, etc. Carry out unique experiments on a single tokamak; Provide existing data to other groups, or analyze data from other groups and; Validate computer models and develop scaling relationships. Most of the proposals require more than one set of experiments, extending into multi-year programs; Only a few proposals are completed in a year. Technical issues in some proposals are addressed in several different tasks on a tokamak (JET is a good example). Several personnel exchanges were organized to facilitate the program activities among the IEA IA Parties. General Observations on the Implementation of the Proposals

6. IEA Large Tokamak Agreement Parties: EU (EFDA-JET), JA, and US EU: J. Pamela (Chair), S. Clemente, M. Watkins, M. Cox JA: M. Kikuchi, Y. Miura, K. Ushigasa, S. Ishida US: E. Oktay, N. Sa uthoff, R. Stambaugh, J. Willis IEA Poloidal Divertor Agreement Parties: EU(IPP-Garching): KO, US EU: M. Kaufmann (Chair), S. Clemente, O. Gruber KO: G.S.Lee, J-H. Han US: E. Oktay, E. Marmar, D. Baker IEA TEXTOR Agreement Parties: CA, EU (IPP-Jelich), JA, US CA: Boucher EU: U. Samm (Chair) JA: N. Noda US: E. Oktay Background Information on the Tokamak related IEA Implementing Agreements