Modeling of resistive wall mode and its control in experiments and ITER

Physics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

21

Macroinstabilities, Plasma-Material Interactions, Boundary Layer Effects, Tokamaks, Spherical Tokamaks, Plasma Simulation, Plasma Dynamics And Flow, Plasma Properties

Scientific paper

Active control of the resistive wall mode (RWM) for DIII-D [Luxon and Davis, Fusion Technol. 8, 441 (1985)] plasmas is studied using the MARS-F code [Y. Q. Liu, et al., Phys. Plasmas 7, 3681 (2000)]. Control optimization shows that the mode can be stabilized up to the ideal wall beta limit, using the internal control coils (I-coils) and poloidal sensors located at the outboard midplane, in combination with an ideal amplifier. With the present DIII-D power supply model, the stabilization is achieved up to 70% of the range between no-wall and ideal-wall limits. Reasonably good quantitative agreement is achieved between MARS-F simulations and experiments on DIII-D and JET (Joint European Torus) [P. H. Rebut et al., Nucl. Fusion 25, 1011 (1985)] on critical rotation for the mode stabilization. Dynamics of rotationally stabilized plasmas is well described by a single mode approximation; whilst a strongly unstable plasma requires a multiple mode description. For ITER [R. Aymar, P. Barabaschi, and Y. Shimomura, Plasma Phys. Controlled Fusion 44, 519 (2002)], the MARS-F simulations show the plasma rotation may not provide a robust mechanism for the RWM stabilization in the advanced scenario. With the assumption of ideal amplifiers, and using optimally tuned controllers and sensor signals, the present feedback coil design in ITER allows stabilization of the n=1 RWM for plasma pressures up to 80% of the range between the no-wall and ideal-wall limits.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Modeling of resistive wall mode and its control in experiments and ITER does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Modeling of resistive wall mode and its control in experiments and ITER, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modeling of resistive wall mode and its control in experiments and ITER will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-931452

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.