Structures and Dynamics of Fine Particle (Dusty) Plasmas with Cylindrical Symmetry: Theory and Simulations

2011 ◽  
Author(s):  
Hiroo Totsuji ◽  
Chieko Totsuji ◽  
Vladimir Yu. Nosenko ◽  
Padma K. Shukla ◽  
Markus H. Thoma ◽  
...  
Keyword(s):  
Fine Particle ◽  
Dusty Plasmas ◽  
Cylindrical Symmetry ◽  
Symmetry Theory

Behavior of dust particles in cylindrical discharges: Structure formation, mixture and void, effect of gravity

2014 ◽  
Vol 80 (6) ◽  
pp. 843-848 ◽  
Author(s):  
Hiroo Totsuji
Keyword(s):  
Structure Formation ◽  
Space Station ◽  
Dusty Plasmas ◽  
Cylindrical Symmetry ◽  
Diffusion Equations ◽  
Dust Particles ◽  
Drift Diffusion ◽  
Strongly Coupled ◽  
International Space ◽  
Void Effect

Theoretical and numerical works on dusty plasmas with cylindrical symmetry are presented. The main purpose has been to investigate behavior of dust particles in strongly coupled dusty plasmas which are expected to be realized in the planned experiments by PK-4 on the International Space Station and experiments by PK-4J, a similar apparatus constructed in Japan. The distribution of dust particles is analyzed on the basis of the drift-diffusion equations and, with the effect of discreteness taken into account, structure formations are numerically simulated.

Probe size and 5th-order aberration

1987 ◽  
Vol 45 ◽  
pp. 134-135 ◽  
Author(s):  
Zhifeng Shao
Keyword(s):  
Electron Probe ◽  
Spherical Aberration ◽  
Wave Length ◽  
Cylindrical Symmetry ◽  
Electron Wave ◽  
Third Order ◽  
The Third ◽  
Probe Radius ◽  
Small Probe ◽  
Probe Size

A small electron probe has many applications in many fields and in the case of the STEM, the probe size essentially determines the ultimate resolution. However, there are many difficulties in obtaining a very small probe.Spherical aberration is one of them and all existing probe forming systems have non-zero spherical aberration. The ultimate probe radius is given byδ = 0.43Csl/4ƛ3/4where ƛ is the electron wave length and it is apparent that δ decreases only slowly with decreasing Cs. Scherzer pointed out that the third order aberration coefficient always has the same sign regardless of the field distribution, provided only that the fields have cylindrical symmetry, are independent of time and no space charge is present. To overcome this problem, he proposed a corrector consisting of octupoles and quadrupoles.

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