scholarly journals Use of Axially Symmetric Electrostatic Fields for Ion Beam Focussing

1983 ◽  
Vol 30 (4) ◽  
pp. 2734-2736 ◽  
Author(s):  
Eugene Colton ◽  
J. C. Kelly
Keyword(s):  
Ion Beam ◽  
Axially Symmetric ◽  
Electrostatic Fields

scholarly journals Безаберрационная линза и корректоры аберраций

2020 ◽  
Vol 90 (6) ◽  
pp. 1016
Author(s):  
В.В. Лукашевич
Keyword(s):  
Phase Diagram ◽  
Ion Beam ◽  
Axially Symmetric ◽  
Diagram Method ◽  
Electrostatic Lenses

An aberration-free four-electrode lens is described for forming an ion beam for mass separators or spectrometers. The lens is a modification of the transaxial lens, in which the circular gaps between the electrodes are replaced by elliptical gaps. A lens converts an axially symmetric beam into a tape-type beam. The lens parameters are found using the phase diagram method. Using the same method, a new aberration corrector for electrostatic lenses and a new sector magnet aberration corrector are developed.

scholarly journals Recent Livermore research on ion beam fusion targets: Utilization of direct-drive efficiency during optimization of symmetry and utilization of polarized DT fuel

1991 ◽  
Vol 9 (3) ◽  
pp. 713-723 ◽  
Author(s):  
James W.-K. Mark
Keyword(s):  
Energy Efficiency ◽  
Ion Beam ◽  
Gaussian Quadrature ◽  
Heavy Ion ◽  
Ion Beams ◽  
Direct Drive ◽  
Axially Symmetric ◽  
Hydrodynamic Simulations ◽  
Positive Effects ◽  
Drive Control

We investigated several examples of ion beam targets that utilize the energy efficiency of direct drive while optimizing on the symmetry requirements. Heavy-ion beams of charge state Z ≥ 3 at 5–10 GeV have ≲15–20 m bending radii with 3.5-T fields. Beams like these could be used with targets involving direct drive. Control of asymmetries in direct-drive ion beam targets depends on control of the effects of residual target asymmetries after an appropriate illumination scheme has been adopted. In this paper, we outline results of our investigations into ion beam target concepts in which the effects of residual asymmetries are ameliorated. The beams are placed according to our axially symmetric Gaussian-quadrature illumination scheme (Mark 1986). The targets survive the effects of residual asymmetries in our recent 2-D hydrodynamic simulations. We also briefly discuss the additional positive effects of polarized DT fuel on ion beam targets.

scholarly journals Gas-discharge plasma application for ion-beam treatment of the holes’ inner surfaces

2021 ◽  
Vol 2064 (1) ◽  
pp. 012079
Author(s):  
D O Sivin ◽  
O S Korneva ◽  
A I Ivanova ◽  
D O Vakhrushev
Keyword(s):  
Stainless Steel ◽  
Ion Beam ◽  
Plasma Boundary ◽  
Axially Symmetric ◽  
Inner Surface ◽  
Ion Beam Treatment ◽  
Steel Aisi ◽  
Aisi 321 ◽  
Nitride Layers ◽  
Stainless Steel Aisi

Abstract The possibility to modify the holes and pipes’ inner surface with focused high-intensity low-energy ion beams was first shown in this work. The studies were carried out using an axially symmetric single-grid system for the ions’ extraction from a free plasma boundary with subsequent ballistic focusing of the ion beam. Ion implantation of the inner surface was carried out in the region of the ion beam defocusing. The studies considered the effect of a nitrogen ions’ beam with energy of 1.4 keV on the inner surface of a tube with a diameter of 20 mm made of stainless steel AISI 321. The beams were formed with a repetition rate of 40 kHz and pulse durations of 5, 7.5 and 10 μs. It is shown that the mutual deposition of the sputtered material on the tube’ opposite sides partly compensates for ion sputtering. As a result of implantation of the inner surface of a pipe made of stainless steel AISI 321, the nitride layers with a thickness of more than 15 microns with a nitrogen dopant content of 22-30 at.% were obtained.

scholarly journals Generated and shifted of Ion beams By Electrostatic Lenses (Einzel lens)

2015 ◽  
Vol 12 (4) ◽  
pp. 814-821
Author(s):  
Baghdad Science Journal
Keyword(s):  
Ion Beam ◽  
Charged Particles ◽  
Ion Beams ◽  
Beam Density ◽  
Size And Shape ◽  
Beam Focusing ◽  
Electrostatic Fields ◽  
Electrostatic Lenses

In this paper, the path of the extracted and focused ions by the electrostatic lense having three electrodes of the same size and shape have been studied. However, the first and third electrodes had a different potential from the second electrode and the distance between any three electrodes was (d).The beams of the charged particles were controlled by using electrostatic fields which are used for accelerating and focusing. This paper focuses also on the effect of electrodes potentials on ion beam focusing. It is found that the best focusing was achieved when the values of the potential of the first and third electrode are equal to half of the value of the second electrode. Concerning transmiting and acumulating the ions beams, the study shows that these beams stayed fixed and steady when their paths were doubled, without any change in extracted beam density. This method is called Plasma Portation.

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