|ji_poster.pdf||2006-03-08 15:58:23||Hantao Ji|
Recent Advances in the SPIRIT (Self-organization Plasma with Induction, Reconnection, and Injection Techniques) Concept
Author: Hantao Ji
Submitted: 2005-12-21 16:28:19
Co-authors: M. Yamada, S.P. Gerhardt, E. Belova, M. Inomoto*, and Y. Ono**
PO Box 451
Princeton, NJ 08543
Since its conception at the ICC 1997 meeting , the SPIRIT concept has been continuously advanced both theoretically and experimentally. The main features of this concept are: (1) formation of Field Reversed Configuration (FRC) plasmas with large flux (50 mWb) by merging two spheromaks with opposite helicities, made by the flux core induction scheme; (2) flexibility to assess the stability characteristics of FRC plasmas by varying plasma shape and kinetic parameter S, by using passive stabilizers, and by injecting energetic ions; (3) sustainment of the FRC for a time significantly longer (1-10 msec) than the energy confinement time using a center stack ohmic-heating (OH) transformer and/or neutral beam injection. Experiments  carried out in TS-3/4 and SSX and more recently in MRX have further verified the effectiveness of the formation scheme for large-flux FRCs. An improved understanding  of FRC stability over plasma shape and kinetic parameter has been obtained in MRX and TS-3/4. New numerical simulations  showed that FRC plasmas can be globally stabilized and continuously sustained by injecting energetic ions. All these new advances of the SPIRIT concept will be summarized, and near-future activities will be discussed.
 M. Yamada, H. Ji, and P. Heitzenroeder, â€śMRX-CT Experiment, Study of Compact Toroids Formed by Induction and Mergingâ€?, Proc. ICC, â€śInnovative Approaches to Fusion Energyâ€? Pleasanton, Calif. Oct. (1997).
 Y. Ono and M. Inomoto, Phys. Plasmas 7, 1863 (2000); C. Cothran, et al., Phys. Plasmas 10, 1748 (2003)
 S. P. Gerhardt et al., â€śEquilibrium and stability of oblate free-boundary FRCs in MRXâ€?, this meeting.
 E. Belova et al., â€śEffects of Energetic Beam Ions on Stability Properties of Field Reversed Configurationsâ€ś, this meeting.