Experimental study of drift wave turbulence and anomalous transport

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Experimental and numerical study of electromagnetic effects on resonance cones

SIGLEAvailable from Bochum Univ. (DE). Sonderforschungsbereich 162 - Plasmaphysik Bochum/Juelich / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Determination of electric field strength in a beam-plasma experiment

SIGLEAlso published in Plasma Phys. Control Fusion (Jan 1986) v. 28(1B) p. 371-386 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Resonance cones in non-Maxwellian plasmas

SIGLEAvailable from Bochum Univ. (DE). Sonderforschungsbereich 162 - Plasmaphysik Bochum/Juelich / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Fast modelling of low pressure radio-frequency collisional capacitively coupled discharge and investigation of the formation of non-Maxwellian electron distribution function

The principles of fast-modelling (FM) of low-pressure radio-frequency capacitively coupled discharge are presented. They are based on averaging over fast electron and ion motions and on eliminating a small spatial scale, the Debye radius. As a result, the solution of self-consistent system of electron kinetic equation, the Poisson, and ion continuity equations takes approximately 10 min on 486 PC. The calculation of discharge parameters has been performed for a wide range of current and pressure. The comparison with full-scale Monte-Carlo calculations and experimental data has been performed. The performed comparisons demonstrate that developed method of the fast-modeling has a good accuracy for calculating the global parameters such as central plasma density, applied voltage, sheath thickness, ionization rate, etc., and the profiles of plasma density and the electric fields. The accuracy of the electron distribution function (EDF) calculation is high when EDF form is not enriched by slow electrons, and seems satisfactory in the case of a strongly peaked EDF. The results are in qualitatively good agreement with the experiment. The quantitative agreement is mainly within a factor of two. This discrepancy can be attributed to the fact that the EDF form is very sensitive to the details of plasma description, e.g. small variation of cross-sections results in considerable changes in the EDF. The mechanism of non-Maxwellian EDF formation due to non-localicty effects has been analyzed. The evolution of the low pressure radio-frequency collisional capacitively coupled discharge with current and pressure variation has been investigated. (orig.)Available from TIB Hannover: RO 9159(54) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Experimental investigation of saturated laser absorption in the Stark-broadened profile of the Balmer line D_6

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Formation of dust and its role in fusion devices

Dust particles are produced in fusion devices by various plasma-surface-interaction mechanisms. This paper discusses properties of dust collected from fusion devices, some dust generation mechanism and the interaction of dust with the cold edge of a fusion plasma. The potential problems for operation and performance associated with the dust-plasma-interaction are outlined. First attempts aiming at the in situ observation of dust in fusion plasmas are presented. (orig.)SIGLEAvailable from TIB Hannover: RO 9159(68)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Propagation and damping of m =+1 and m =-1 helicon modes in an inhomogeneous plasma column

The effect of the density gradient on the dispersion of the m=+1 and m=-1 helicon modes is investigated both theoretically as well as numerically. In particular, attention is focussed on the helicon wave damping that is closely related to the rf power absorption and the Poynting flux. It is shown that the propagation characteristics of the m=-1 mode changes drastically when the density gradient is sufficiently strong: This mode exhibits a cut-off that depends on the gradient scale length and the plasma parameters. In the regime where both helicon modes propagate, the excitation of the m=-1 mode is unlikely as it is strongly damped. The results give evidence that the density gradient effect is decisive for the formation of helicon discharges which are predominantly sustained by the m=+1 mode. (orig.)SIGLEAvailable from TIB Hannover: RO 9159(66)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Study of lower-hybrid wave propagation in the presence of low-frequency fluctuations

SIGLEAvailable from TIB Hannover: RO 9159(1992,17) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Cavity diagnostics on fluctuating discharges

SIGLEAvailable from TIB Hannover: RO 9159(10-A4-91) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman