Electron Beam as a Method of Finding the Potential Distribution in a Cylindrically Symmetric Plasma

1971 ◽  
Vol 42 (7) ◽  
pp. 2831-2834 ◽  
Author(s):  
Charles H. Stallings
Keyword(s):  
Electron Beam ◽  
Potential Distribution ◽  
Cylindrically Symmetric

V-Shaped Potential Distribution with a Virtual Cathode Generated by an Electron Beam Injection

1982 ◽  
Vol 51 (2) ◽  
pp. 650-657 ◽  
Author(s):  
Hiroharu Fujita ◽  
Shinya Yagura ◽  
Eiichi Yamada ◽  
Akira Aoyagi
Keyword(s):  
Electron Beam ◽  
Potential Distribution ◽  
Virtual Cathode ◽  
Beam Injection

Characteristics of the foil lens for the correction of the spherical aberration and its application to STEM

1978 ◽  
Vol 36 (1) ◽  
pp. 38-39
Author(s):  
M. Hibino ◽  
M. Kuzuya ◽  
T. Hanai ◽  
S. Maruse
Keyword(s):  
Electron Beam ◽  
Potential Distribution ◽  
Spherical Aberration ◽  
Magnetic Lens ◽  
Aperture Diaphragm ◽  
Concave Lens ◽  
Thin Conducting

There have been a number of methods proposed and investigated for the correction of the spherical aberration, since this aberration is one of the most important factors which limit the performance of various kinds of electron beam instruments. A foil lens has been investigated preliminarily and the possibility of correcting the spherical aberration of a conventional magnetic lens with reasonable ease has been shown for the first time.The foil lens studied consists of an aperture diaphragm and a thin conducting foil fundamentally as is shown in Fig. 1, and is simple enough in design and adjustment. When the voltage is applied between the diaphragm and the foil, the curved potential distribution is produced around the aperture and the foil lens acts as a concave or negative lens. This concave lens produces the negative spherical aberration and can be utilized to correct the positive spherical aberration of the conventional magnetic lens.

Potential Distribution in a Two-emitter Diode

1970 ◽  
Vol 25 (4) ◽  
pp. 504-518 ◽  
Author(s):  
Manfred Troppmann
Keyword(s):  
Electron Beam ◽  
Velocity Distribution ◽  
Potential Distribution ◽  
Necessary Conditions ◽  
Plasma Potential ◽  
Collision Probability ◽  
Oscillatory Potential ◽  
Plasma Diode ◽  
Ion Collision ◽  
Uniform Plasma

Abstract The existing model of a "collisionless" alkali plasma diode is extended including the case of two incandescent plane electrodes emitting electrons as well as ions with a half-Maxwellian velocity distribution. The potential distributions within the diode space derived from this theory are examined in detail. Physically necessary conditions reduce the well-known ambiguity of solutions to a single one (with uniform plasma potential) at a given set of parameters. Further solutions, cor-responding to spatially oscillatory potential shapes which are consistent with the collisionless theory, disappear if the ion-ion collision probability within the diode plasma exceeds 0.1 per emitter distance.In the experiment the potential distributions are scanned using a new electron beam probing technique. The results agree with theory.

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