NIMROD TEAM MEETING

NIMROD TEAM MEETING

27 - 28 OCTOBER 2001

BAY ROOM

COURTYARD BY MARRIOTT

500 E. FIRST ST.

LONG BEACH, CA

MINUTES

SATURDAY, 27 OCTOBER

Tom Giankon

Rick Nebel

Jean-Noel Leboeuf

Rostom Dagazian

Dalton Schnack

Scott Parker

Eric Held

John James

Carl Sovinec

X. Tang

Jim Callen

Chris Hegna

Dylan Brennan

Curt Bolton (Sunday)

Alfonso Tarditi (Sunday)

Steve Eckstrand (Sunday)

Alan Glasser (Sunday)

1 PM - 4 PM: Code development issues

- Vacuum region (Scott K.)

Scott presented new work on generating grids in the vacuum, and modeling the vacuum. It uses a "smoothed" outer boundary shape that is not self-similar with the separatrix. Several gridding options have been implemented. Applications to classical tearing mode ohmic DIII-D discharge were presented. The correct mode structure is recovered recovered as when the wall is away from the plasma.

- Closures (Tom)

A paper on closures has been accepted for publications in Phys. Plasmas, Jan. 2002 publication date. Applications to 86144 are underway.

- Resistive wall (Tom)

Toroidal vacuum still needs to be done. Morrell Chance has been contacted again since the Madison meeting. We are ready to accept the response functions, but we need input from either Chance or Pletzer.

- 2-fluid (Rick)

A bug was found in the pitch-and-pressure equilibrium model. We think NIMROD is giving the right MHD answer. Real 2-fluid calculations for tokamaks on long time scales still require considerable code development and numerical research.

- Energetic particles (Scott P., Charlson)

Progress on parallelization was reported. There are load balancing issues. Will have parallel implementation by Sherwood. Will also have results on kink mode stabilization.

- CEL development (Eric)

Testing if the proposed CEL algorithms are feasible in the present NIMROD implementation. The 3-D temperature SI operator stabilizes the algorithm. The calculation of q seems a little expensive, but good progress has been made.

- General development (Carl)

Density evolution is complete. Several new energy equation options have been implemented. Highly anisotropic diffusion calculations have been demonstrated. Effective perpendicular diffusion has been quantified. Convergence is excellent

4 PM - 5 PM: Discussion of external critique (Dalton, all)

- Are any of these criticisms valid?

- If so, how can we address them?

- In light of these comments, how should we prioritize our near-term goals?

A discussion was held. We must maintain the vision, but publicize more.

5 PM - 5:30 PM: Formulation of near term goals (all)

By SHERWOOD:

Eric - Reproduce Tom's NTM results with CEL model

Dalton - paper submitted on 87009 problem

Scott K. - Linear vecuum 87009 and 97441 cases complete.

Tom - Get Osama bin Ladin; 2 papers submitted

Dylan - 98548 case complete, draft of paper

Rostom - assure funding

Jim/Chris - formulate plan testing 2-fluid modeling

Scott P. - particles parallel

Carl - JCP on spatial discretization; starting flow modification

Rick - ???/ 2 fluid problems resolved, if time and effort permits

5:30 - 6 PM: Discussion of SciDAC plans, + Other business

Plans were given.

All things were discussed openly.

SUNDAY, 28 OCTOBER

8:30 AM - 11 AM: Applications

- Neo-classical effects (Tom)

Tom also talked about anisotropic heat flux. Neo-classical analysis of 86144 is going very well.

- High-beta disruption (Dalton)

Blah, blah, blah......

- DIII-D applications (Dylan)

Using NIMROD to analyze DIII-D shots. Progress being made.

- Alternates (Carl?)

Spheromaks and sheared flow.

- Plasma thruster (Alfonso)