Final report on the Purchase Order B-192560
This is final report on the Purchase Order B-192560. It consists of 3 chapters. Chapter 1 contains stability analysis of axisymmetric plasma configurations in which there exists a population of ``hot`` particles whose drift frequency around the magnetic axis greatly exceeds the frequency of the flute perturbation. It is shown that fast drifting particles affect not potential energy of MHD perturbations but their kinetic energy. The possibility of the stabilization of the flute instability due to the ``negative inertia`` effect is discussed. Chapter 2 is devoted to the theory of non-paraxial MHD stabilizers for axisymetric mirror devices for plasma confinement. In this chapter, a method of search of axisymmetric configurations which provide stability of rigid flute mode is given and several theorems, elucidating the effects of non-paraxiality on flute modes stabilization by sloshing ions are proved. Chapter 3 presents experimental part of the work. Two interrelated sets of experiments were planned for the GDT facility in order to study the problems included into an experimental part of the work. The first was intended for measurements of a pressure-weighted curvature observing a plasma equilibrium response to applying a small test perturbation of magnetic field in the MHD-anchor region. A simple magneto-hydrodynamic model is used to deduce from experimental data the pressure-weighted curvature of the field lines that determines a plasma stability against flute modes. Another set of experiments was devoted to studying the stabilization of the flutes by a cusp end cell. The cusp cell was attached to the GDT device at early 1992. The cusp coils was electrically tested and desired parameters were achieved. Within, the frame of this Purchase Order we accurately measured plasma parameters in the cusp, studied stability limits and measured some spatial characteristics of the unstable MHD-modes above the instability threshold.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10102456
- Report Number(s):
- UCRL-CR-113276; ON: DE93019502
- Resource Relation:
- Other Information: PBD: Mar 1993
- Country of Publication:
- United States
- Language:
- English
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