D. E. Baldwin

Radial transport reduction in tandem mirrors using end-wall boundary conditions

Results from the Tandem Mirror Experiment‐Upgrade (TMX‐U) demonstrate that radial transport in the plasma volume can be affected by the boundary conditions at the end wall. Measurements in which end‐wall plates, mapping to the plasma core, are switched from floating to grounded during plugging operation demonstrate that this floating increases the build‐up rate of the central cell plasma (by increasing the radial confinement time), steepens the core density profile, and affects the plasma throughout the entire cross section.

Destabilization of the hot‐electron precessional mode in tandem mirrors and bumpy tori

The high‐frequency precessional mode of a hot‐electron‐stabilized magnetic configuration has previously been shown to be stable in a window of core‐plasma mass. Under conditions of frequency matching, the resulting stable negative‐energy precessional wave can be destabilized by coupling to positive‐energy shear‐Alfven waves. Coupling is avoided when the hot‐electron precession frequency exceeds the core‐plasma ion gyrofrequency.

Differential equation for Alfvén ion cyclotron waves in finite‐length plasma

The fourth‐order differential equation describing an Alfven ion‐cyclotron wave propagating along a magnetic field of varying intensity is found. The equation is self‐adjoint and possesses nontrivial turning points.

Effect of magnetic line fanning on microinstabilities in minimum‐β wells

The fanning of magnetic lines in a minimum‐B mirror machine creates distortion of the constant phase surfaces of ion‐cyclotron loss cone modes. This distortion can stabilize infinite‐medium modes which occur for narrow bands of k⊥.

Potential-confined cold plasma stabilization of loss-cone modes in mirror machines

The analysis of cold plasma stabilization of the drift‐cyclotron‐loss‐cone mode in mirror machines is extended to conditions in which the cold plasma is confined by a weak local minimum in the ambipolar potential. These conditions allow stabilization with less electron energy drain than simple axial flow of cold plasma. Scaling laws are derived for the required cold plasma flux, the resulting fluctuation induced ion diffusion, the steady state electron temperature, and the trapped‐ion lifetime.

Enhanced scattering inherent to ’’loss‐cone’’ ion distributions— General geometry

The ion scattering rate due to the Post–Rosenbluth convective loss‐cone instability is calculated for general geometry. Noise generated by particle discreteness is amplified by the instability, the details of which are sensitively dependent upon the spatial variation of plasma parameters. Ray equations are developed for the transport and amplification of wave energy.

Report of ITER special working group 1

ITER Special Working Group 1 (SWG-1) was established by the terms of the ITER-EDA Agreement. According to that agreement {open_quotes}SWG-1 shall, based on the (ITER) Conceptual Design Report, review the detailed technical objectives along with the technical approaches to determine the best practicable way to achieve the programmatic objective of ITER, as described in Article 1 of the Agreement...SWG-1 shall submit, not later than three months after entry into force of the Agreement, its findings in a Review Report to the Council for its approval.{close_quotes} The ITER Council subsequently provided to SWG-1, as `a general guideline,` that detailed technical objectives and technical approaches, including appropriate safety margins, should be compatible with the aim of maintaining the cost of the device within the limits comparable to those indicated in the final report of the ITER CDA (Conceptual Design Activities), as well as keeping its impact in the long-range fusion program. The Council asked the Director to present an outline of the design within about 10 months, at the time when a draft agreement of Protocol 2 should have been prepared by SWG-2. This paper is the varbatim report of SWG-1.

Fusion Energy Advisory Committee report on program strategy for U. S. magnetic fusion energy research

The Fusion Energy Advisory Committee (FEAC) was charged by the Department of Energy (DOE) with developing recommendations on how best to pursue the goal of a practical magnetic fusion reactor in the context of several budget scenarios covering the period FY 1994-FY 1998. Four budget scenarios were examined, each anchored to the FY 1993 figure of

Electron scattering by enhanced fluctuations in quiescent mirror machines

337.9 million for fusion energy (less

Report of panel 4: Priorities in the intermediate confinement experiments

9 million for inertial fusion energy which is not examined here).