Organizing Committee: Joe Carlson George Fuller * Wick Haxton haxton@berkeley.edu Tom Luu Juan Meza Tony Mezzacappa John Negele Esmond Ng Steve Pieper Martin Savage James Vary Pavlos Vranas *corresponding member for scientific questions
Program Coordinator: Exit report Application form 
Extreme Computing and its Implications for the Nuclear Physics/Applied Mathematics/Computer Science Interface June 6  July 8, 2011
Applications and Program Organization
Weeks one, two, three, and five will be organized in the usual INT way, with seminars limited to one or two per day so that participants will have free time for discussions and collaborations. The fourth week will be a more intense workshop similar to the Grand Challenge workshops that the DOE organized in 2008 and 2009. As in these earlier workshops, the focus will be the steps that nuclear physics, applied mathematics, and computer science communities should take in order to optimize the nuclear physics transition to exascale computation.
Overview This program will focus on preparing the way for such an increase in computing: what kinds of community organization and new partnerships with applied mathematics and computer science will be necessary if nuclear theory is to reach the next level in high performance computing? It is generally believed that current petascale platforms may give way to a new generation of machines that are significantly more powerful, but also significantly more complex, based on processor architectures where perhaps 1000 cores are integrated on a chip. Nuclear physicists face the challenge of using these machines for newly envisioned calculations. They will also have to reformulate the mathematics, algorithms, and programming of existing codes. The challenge is similar to one our experimental colleagues faced three decades ago, in making the transition from smallscale nuclear experiments to flagship accelerator facilities that demand large collaborations and significant technical support. Computational nuclear theory must evolve in a similar way, building effective collaborations within our field as well as effective partnerships with applied mathematicians and computer scientists, if we are to continue to play a role in highperformance computing (HPC). The program will bring nuclear theorists together with a significant community of applied mathematicians and computer scientists to discuss what should be done now to prepare the field for coming changes. The goals of the program are to identify key opportunities in computational nuclear physics, and to develop a common language for discussing the underlying algorithms, so that potential collaborators can better envision how they and we might work together. Specifically, we hope to analyze several of the key problems in computational nuclear physics:
