Workshop Topics
The 1st AP TWG meeting will consist of:
  1. Special Plenary Topical Contributed Sessions?
  2. Working Group Sessions
  3. Posters
  4. Summary session
Special Plenary Topical Contributed Sessions?
 We plan to hold two special interdisciplinary plenary contributed sessions. The topics of these sessions are:

P1) Why does the plasma rotate without external torque ?
 Since the discovery of non-diffusive momentum transport in 1995, the plasma rotation without external torque has been a long term problem and topic of interest, for which the mechanism has not been clarified. Recently, theoretical models have been proposed to explain the rotation due to the intrinsic torque. In this session, experimental observations and theoretical models and simulations will be discussed to obtain a deeper understanding of the physics mechanism of intrinsic torque and rotation.


P2) Why is the transport of plasmas NOT determined by a local quantity ?
 The non-local phenomena, where the core temperature increases associated with the drop of temperature at the edge, was found in 1995. After that, numerous experimental evidence for the coupling of core and edge transport in the plasma emerged. However, the physics mechanism to connect the transport at different plasma locations has been open to question. The observation of long-range turbulence and mesoscale structures suggests that the coupling between large scale or mesoscale and short-range turbulence would be a candidate to explain the mechanism. In this session, non-local phenomena for transport and mesoscale structures and possible models will be discussed.

The purpose of these sessions is to discuss problems that have not been clarified yet. Loosely following the style of the EU-US TTF meetings, the plenary sessions will consist of brief introductory overviews, several contributed oral papers, and group discussion, with a discussion leader. APTWG meeting participants are encouraged to submit contributed papers to these two special sessions. The scope of the topics is intentionally broad, so as to accommodate a diversity of approaches.

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.

A. Momentum transport Working Group (K.Itoh, Q.Ren)
This working group was created to increase focus on plasma rotation, which influences transport in a number of ways. Important topics for the meeting include:
  • Toroidal momentum transport, especially non-diffusive mechanisms, off-diagonal terms
  • Cross coupling between poloidal and toroidal rotations
  • Relation to the non-diffusivity in the particle transport
  • Theoretical modeling of intrinsic torque and rotation

B. Non-locality in transport Working Group (S.Inagaki, X.T.Ding)
The Non-locality in transport working group covers transport issues from the center to the edge plasma and focuses on the relation between core transport and edge transport. Topics include:
  • Coupling between core transport and edge transport
  • Long-range turbulence responsible for the non-locality in transport
  • Dynamics of Internal Transport Barriers ? including curvature transition
  • Physics of mesoscale transport structures (e.g. zonal flows, streamers, avalanches)

C. Edge turbulence and L-H transition Working Group (J.Dong, T.S. Hahm)
The Edge Physics group covers transport physics in the region just inside and outside the last closed flux surface, with emphasis on edge turbulence and the transition and back-transition between L-mode and H-mode plasmas. Topics of interest include:
  • Edge turbulence and zonal flow in the L-mode and H-mode Plasmas
  • Transport in the pedestal during the ELMs and other edge MHD activity
  • Mechanisms for L-H and H-L transitions, including the multi-states of H-modes
  • Physics of the density limit

D. 3D effects on transport physics Working Group (K.Ida, H.Park)
3D effects on transport physics Working Group is aiming to clarify the role of non-axisymmetric effects in tokamak, helical and RFP plasmas through intrinsic or applied 3D magnetic structures. Topics of interest include:
  • Controlling ELMs through stochastization of the magnetic field
  • The transition between the nesting and stochastic magnetic flux
  • 3D effect on the driving and damping mechanisms of zonal flows
  • Interplay between mean radial electric fields and zonal flows