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Workshop Working Groups

Each working group includes both theory and experiment, with the
ultimate goal being tests of theory, simulations and models against
experiment. In addition, diagnostic needs and novel diagnostic ideas
for a given area are also included in the scope of each working group.
The reality of the ITER project provides extra impetus for work on
burning plasma transport issues relevant to each of the working
groups.

A. Core Working Group (D. Newman, C. Greenfield)
The core working group covers transport issues from the center of the
plasma to the top of the H-mode edge pedestal. Topic include
- Electron and ion thermal transport
- Particle transport
- Momentum transport and generation
- Profile/ transport control/modification issues (e.g role of
rotation, sources, plasma shape, etc.)
- Formation, control and dynamics of Internal Transport Barriers
- Core-edge interface (the edge as a dynamic boundary for the core)
- Physics of transport structures (e.g. zonal flows, streamers, avalanches)
- High performance and burning plasmas (ie steady state, bootstrap
dominated etc)

B. Edge Physics Working Group (R. Groebner, R. Moyer)
The Edge Physics group covers transport physics in the region just
inside and outside the last closed flux surface, with emphasis on
H-mode plasmas. Topics of interest include:
- Physics of H-mode pedestal structure
- Pedestal Transport, sources and sinks
- Transport induced by ELMs and other edge MHD activity
- Transport in the scrape-off layer
- Mechanism for L-H transition

C. Fast Particle Working Group (B. Breizman)
- Study of fast-particle-drive instabilities
- Assessment of fast particle effects on burning plasma performance
(e.g. ITER)
- Fast particle diagnostics in burning plasmas
- MHD spectroscopy
- Theory and simulation of nonlinear wave-particle interactions
- Interpreation of fast particle data from present experiments and projections for burning plasma

D. Momentum Transport and the Origins of Spontaneous Rotation
(P.H. Diamond, T.S. Hahm, J. Rice)

This working group is being created in 2007 to provide increased focus on plasma rotation, which influences transport in a number of ways. Important topics for the 2007 meeting include
:
- Toroidal momentum transport, especially non-diffusive mechanisms,
off-diagonal contributions, etc.
- Cross coupling between particle transport and momentum transport
- Influence of edge plasma properties on spontaneous rotation and momentum transport
- Poloidal momentum transport in low collisionality plasmas
- Integrative modelling of spontaneous rotation

E. Verification and Validation Working Group (P.W. Terry, W. Nevins)
The Verification and Validation Group has been charged with examining
verification and validation (V&V) as it has been defined and structured
generally and in other scientific fields, and with formulating V&V procedures
and practices applicable to the range of numerical modeling activities within the US fusion program, taking into consideration the goals, expectations and desired outcomes of different modeling activities, and resource limitations that are likely to apply to verification and validation. This group is presently working and expects to report its activities and findings at the TTF meeting in San Diego and seek feedback from the wider community.