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Overview of recent results from the WEGA stellarator

Otte M., Laqua H. P., Chlechowitz E., Marsen S., Preinhaelter J., Stange T., Rodatos A., Urban J., Zhang D.

Nukleonika

2012

Vol. 57, No. 2

171-175

Repeated magnetic flux surface measurements confirmed the existence of closed and nested flux surfaces, but also revealed the existence of magnetic error fields. The simultaneous application of two radio frequency systems for plasma heating operating at 28 GHz and 2.45 GHz, respectively, allowed to reach otherwise non-accessible plasma regimes in WEGA due to synergetic effects. These regimes are characterized by over-dense plasmas at 0.5 T operation by means of electron Bernstein wave heating and the existence of supra-thermal electrons associated with soft X-ray and gamma-rays. The thermal electron diffusion coefficient was determined in the electron Bernstein wave heated plasma regime. Additionally, results from turbulence studies in low density plasmas in the vicinity of magnetic islands are presented.

Nuclear fusion - energy for future

Sadowski M.

Nukleonika

2005

Vol. 50,suppl.3

53-58

This invited paper has been written on the 50th anniversary of the Institute of Nuclear Research (IBJ). The introduction describes basic nuclear fusion reactions and the appearance of high-temperature plasma, as well as different methods of the plasma generation and containment. The first part of the paper contains a concise description of the present status of research on controlled fusion and the construction of a thermonuclear reactor. The most important results of experiments oriented on magnetic confinement fusion (MCF) or inertial confinement fusion (ICF) are characterized. The second part of the paper presents a story of high-temperature plasma research carried out at IBJ (and now continued at IPJ) at Świerk. The main experimental facilities and scientific results, as obtained with those, are described. The most important achievements of IBJ (IPJ) researchers in the field of plasma physics and technology are indicated, and in particular: invention and development of the so-called RPI facilities producing intense plasma-ion streams, discovery and experimental study of a new configuration of a magnetic trap called the spherical multipole (SM) configuration, development of various plasma diagnostic techniques, and the optimization of different plasmafocus (PF) facilities.