Q3 ELM MILESTONE WORK PLAN
"Q3__Further extend the studies to include variation of the electron pressure parallel to the magnetic field lines in the electron momentum equation. Determine specific equilibria and physics specifications that best capture the important physics in the evolution of the plasma into the vacuum region surronding the plasma."

On April11, Brennan, Jardin, Pankin, Barnes and Schnack met to formulate a work plan for completion of the Q3 ELM milestone. It was agreed that a series of equilibria would be generated. These will then be studied for stability by NIMROD, M3D, and BOUT.

It was pointed out that the "letter" of the "community wide" Q3 milestone has already been satisfied, since BOUT has reported full nonlinear Braginskii fluid simulations of an ELM. The work plan outlined below should therefore be viewed as a mechanism for achieving a scientific, rather than programmatic, goal.

Definitions of equilibria:

The "Q1 equilibrium" is the equilibrium used for the studies reported for the Q1 milestone. It was constructed to be stable in the core and to emphasize the structure in the edge. It does not have an X-point. It is not based on an experimental equilibrium construction.
The "Q2 equilibrium" is the equilibrium used for studies reported for the Q2 milestone. It is based on DIII-D EFIT reconstructed profiles, and is therefore "more realistic". However, the unstable modes found by NIMROD were not ELMs, but rather probably internal resistive interchanges.
The "Q3 equilibrium" is the one that will be used for the Q3 milestone. It will be based on the Q2 equilibrium.

TASKS:

Make the Q1 equilibrium files available to the 2-fluid developers, and to the M3D and BOUT teams. This may be done by posting on the CEMM web site.
Responsible party: Dylan Brennan
Target date: April 15, 2005
Complete development and implementation of 2-fluid (Hall, grad_pe, and ion viscosity) effects in NIMROD. Make sure that the codes work on the Q1 equilibrium case. Assure that developments are properly merged in a single version of the code.
Responsible parties: Dan Barnes, Carl Sovinec (2-fluid); Alexei Pankin, Dalton Schnack (GV)
Target date: June 1, 2005
Generate the initial Q3 equilibrium as modifications of the Q2 equilibrium with the aim of eliminating internal modes and destabilizing ELMs.
Responsible party: Dylan Brennan
Target date: April 20, 2005
Begin testing Q3 equilibria for linear ideal and resistive MHD instability with ELITE, DCON, and NIMROD. Further modify the Q3 equilibrium, as required, to achieve the desired stability properties. If possible, produce a sequence of Q3 equilibria that span the ELM stability boundary.
Responsible parties: Phil Snyder (ELITE), Alexei Pankin (DCON), Dalton Schnack (NIMROD)
Target date: May 31, 2005
Produce plots of linear growth rate vs. n for Q1 equilibrium with resistive and 2-fluid models with NIMROD.
Responsible party: Alexei Pankin, Dalton Schnack (NIMROD)
Target date: June 15, 2005
Produce plots of linear growth rate vs. n for Q3 equilibrium with resistive and 2-fluid models with NIMROD.
Responible parties: Alexei Pankin, Dalton Schnack (NIMROD)
Target date: June 20, 2005
Perform scoping study of ELMs in ITER equilibrium with M3D code using resistive MHD model.
Responible parties: H. Strauss
Target date: June 20, 2005
Run BOUT on the Q1 and Q3 equlibria.
Responsible parties: Phil Snyder, M. Udensky(?)
Target date: June 20, 2005
Submit Q3 milestone report to DOE.
Responsible party: Dalton Schnack
Target date: June 30, 2005

Last modified on 22 April 2005.

please email contributions to jardin@pppl.gov