arXiv subjects

A. B. Kukushkin

Publications and source records attributed to A. B. Kukushkin.

21 records · Page 2Linked to original sources

arXiv2002

"Wild Cables" in Fusion Plasmas and their Diagnostics with Spectral Line Stark Broadening

We discuss the opportunities of diagnosing the parameters of hypothetical "wild cables" in fusion plasmas via analyzing the Stark broadening of hydrogen spectral lines. The "wild cables" concept have suggested the observed long-lived skeletal structures in tokamaks and Z-pinches to be caused by a microdust-assembled skeleton. We present the results of calculating the widths of vacuum channels produced by the pressure of on-skeleton high-frequency (HF) electromagnetic waves of the TEM type, which thus might protect the skeletons from ambient high-temperature plasma. The values of amplitude of such wave appear to be compatible with the measurements of those in-plasma HF electric fields in tokamak T-10 and a gaseous Z-pinch which give observable Stark broadening of hydrogen spectral lines.

physics.plasm-ph↗

arXiv2001

Long-lived filaments in fusion plasmas: review of observations and status of hypothesis of microdust-assembled skeletons

A brief review is given of the progress in studying the long-lived filaments (LLFs) in fusion plasmas (tokamaks, Z-pinch, plasma focus). The paper reports on (i) resolving the fine structure of LLFs, and (ii) verification of our hypothesis (1998) which suggested the LLFs to possess a microsolid skeleton. The recent proof-of-concept studies showed the presence of tubular and cartwheel-like structures in (i) various dust deposits in tokamak T-10, in the range 10 nm - 10 mcm, and (ii) visible light images of plasma, in the range 100 mcm - 10 cm, at initial stage of discharge (e.g., before appearance of discharge electric current) in tokamak, plasma focus and vacuum spark. The topological similarity of the above structures (especially, "cartwheels") and the observed trend of assembling bigger tubules from smaller ones (i.e. the self-similarity) allow to draw a bridge between the microdust skeletons in the dust deposits and the centimeter scale LLFs in fusion plasmas.

physics.plasm-ph↗

arXiv1999

Wild cables and survivability of macroscopic molecular structures in hot tokamak plasmas

The evidences for tubular rigid-body structures are found in tokamak plasmas, which are similar to long-living filaments observed in a Z-pinch ([1] Kukushkin, Rantsev-Kartinov, Proc. 26-th EPS conf., http://epsppd.epfl.ch/cross/p2087.htm). These structures are suggested to be a "wild cables" produced by the channelling of EM energy pumped from the external electric circuit and propagated to the plasma core in the form of the high frequency EM waves along hypothetical (carbon) microsolid skeletons [1] which are assembled during electric breakdown. It is shown that such skeletons may be protected from the high-temperature ambient plasma by the TEM waves produced thanks to the presence of microsolid skeletons.

physics.plasm-ph↗