This paper reports the experimental and theoretical investigation on the coexistence of the collisional drift and flute wave instabilities in the bounded linear electron cyclotron resonance (ECR) plasma. The drift wave instability is excited by the steep density gradient and imposed axial boundary conditions in the device. The flute instability is excited by the bad curvature of the magnetic field. Emphasis is made on the effect of the ion-neutral (i-n) particle collisions. It is observed that the drift wave instability is excited when the in particle collision frequency in is low, but it is stabilized when in is high. Furthermore, the drift and flute modes are coexistent for the intermediate values of in. The Hasegawa-Wakatani model which describes the dispersion relation of the collisional drift-interchange mode is used for understanding the experimental observations. It is found that the experimentally observed drift frequency is consistent with the numerical calculation. The present result has shown that the in particle collisions play an important role in the stabilization of the collisional drift wave instability in the ECR plasma.
Two methods, the Method of Effective Trajectories and the Method of Distorted Particle Flux, are suggested for calculation of cross-sections of n-n'transitions between Rydberg states of multicharged ions induced by electron impact. These methods are based on rectilinear trajectories with effective impact parameter and effective velocity. The difference between direct calculations of CoulombBom cross-sections and these methods for transitions with principal quantum numbers n,n' Q 6 is about 10-20%. Calculations of cross-sections 20 20 + An are given.
We propose the concept of ‘nano-factory in plasma’ which is a miniature version of a macroscopic conventional factory. A nano-factory in plasma produces nanoblocks and radicals (adhesives) in reactive plasmas, transports nanoblocks towards a substrate and arranges them on the substrate. We describe several key control methods for a nano-factory in plasma: size and structure control of nanoparticles, control of their agglomeration, transport and sticking, and then explain the combination of several types of control. Finally we point out remaining important issues in nano-factories in plasma.
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