H− ion beam extraction from a transformer coupled plasma source with triode extraction system

2006 ◽  
Vol 77 (3) ◽  
pp. 03A536 ◽  
Author(s):  
H. S. Jeong ◽  
Y. J. Kim ◽  
I. S. Hong ◽  
D. H. Park ◽  
Y. S. Hwang
Keyword(s):  
Ion Beam ◽  
Plasma Source ◽  
Extraction System ◽  
Beam Extraction

A New Design and Computer Simulation of a 5-Electrode Ion Extraction/Focusing System

2005 ◽  
Vol 107 ◽  
pp. 21-24 ◽  
Author(s):  
M. Medhisuwakul ◽  
Thiraphat Vilaithong ◽  
Jürgen Engemann
Keyword(s):  
Microwave Plasma ◽  
Ion Beam ◽  
Plasma Source ◽  
Ion Source ◽  
Simulation Software ◽  
Ion Current ◽  
Extraction System ◽  
Beam Shape ◽  
Ion Extraction ◽  
Argon Ion

A 13.56 MHz radio-frequency (rf) driven multicusp ion source has been constructed [1] to produce a high argon ion current density. Milliampere-range argon ion current can be extracted from the source. An in-waveguide microwave plasma source has been utilized as the ion beam neutralizer [2]. The neutralization source was placed 20 cm downstream from the extraction system. With the former extraction system, comprised of extraction electrodes and an Einzel lens, the electrons from the neutralizer were attracted to the high positive potential of the lens. Consequently, the potential of the lens drops and the beam is diverged. To suppress electrons from being accelerated to the Einzel lens a negatively biased electrode was placed before the last electrode, which is grounded, to produce a retarding electric field for electrons. The hole of the electrode was made small to make sure that the potential at the center is negative enough to suppress electrons. All simulations have been performed with the KOBRA3-INP simulation software. The results of the beam shape from the simulation will be presented.

Extraction of an ion beam from a diverter‐type plasma source

1977 ◽  
Vol 48 (5) ◽  
pp. 571-572 ◽  
Author(s):  
K. Yatsu ◽  
Y. Nozaki ◽  
S. Hagiwara ◽  
S. Miyoshi
Keyword(s):  
Ion Beam ◽  
Plasma Source

scholarly journals Ferroelectric Plasma Source for Heavy Ion Beam Charge Neutralization

2006 ◽  
Author(s):  
P.C. Efthimion ◽  
E.P. Gilson ◽  
L. Grisham ◽  
R.C. Davidson ◽  
S. Yu ◽  
...  
Keyword(s):  
Ion Beam ◽  
Plasma Source ◽  
Heavy Ion ◽  
Charge Neutralization ◽  
Heavy Ion Beam

scholarly journals Forevacuum plasma source of ribbon electron beam with a multi-aperture extraction system

2019 ◽  
Vol 1393 ◽  
pp. 012045 ◽  
Author(s):  
A S Klimov ◽  
A A Zenin ◽  
Tran Van Tu ◽  
I Yu Bakeev
Keyword(s):  
Electron Beam ◽  
Plasma Source ◽  
Extraction System

scholarly journals Effect of permanent magnets on plasma confinement and ion beam properties in a double layer helicon plasma source

2019 ◽  
Vol 85 (3) ◽  
Author(s):  
Erik Varberg ◽  
Åshild Fredriksen
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
Ion Beam ◽  
Plasma Source ◽  
Diffusion Chamber ◽  
Plasma Potential ◽  
Field Energy ◽  
Plasma Confinement ◽  
Plasma Device ◽  
Field Lines

The work described in this article was carried out to investigate how permanent magnets (PM) affect the plasma confinement and ion beam properties in an inductively coupled plasma which expands from a helicon source. The cylindrical plasma device Njord has a 13 cm long and 20 cm wide stainless steel port connecting the source chamber and the diffusion chamber. The source chamber has an axial magnetic field produced by two coils, with magnetic field lines expanding into the diffusion chamber. Simulations have shown that the field lines leaving the edge of the source hit the port wall, causing a loss of electrons in this section. In the experiments performed in this work, PMs were added around the port walls near the exit of a plasma source and the effect was investigated experimentally by means of a retarding field energy analyser probe. The plasma potential, ion density and ion beam parameters were estimated, and the results with and without the PMs were compared. The results showed that the plasma density in the centre can in some cases be doubled, and the density at the edges of the plasma increased significantly with PMs in place. Although the plasma potential was slightly affected, and the beam velocity dropped by ${\sim}$ 10 %, the ion beam flux increased by a factor of 1.5.

Development of a compact permanent magnet helicon plasma source for ion beam bioengineering

2011 ◽  
Vol 82 (10) ◽  
pp. 103503 ◽  
Author(s):  
P. Kerdtongmee ◽  
D. Srinoum ◽  
M. Nisoa
Keyword(s):  
Permanent Magnet ◽  
Ion Beam ◽  
Plasma Source ◽  
Helicon Plasma

Low‐energy ion beam extraction and transport: Experiment–computer comparison

1994 ◽  
Vol 65 (4) ◽  
pp. 1441-1443 ◽  
Author(s):  
Peter Spädtke ◽  
Ian Brown ◽  
Paul Fojas
Keyword(s):  
Ion Beam ◽  
Low Energy ◽  
Beam Extraction ◽  
Transport Experiment

Analysis of the Effect of Beam Divergence Angle on Back-Streaming Electron Region in Ion Source for EAST-Neutral Beam Injection

2018 ◽  
Vol 4 (3) ◽  
Author(s):  
Hu Chundong ◽  
Wu Mingshan ◽  
Xie Yahong ◽  
Wei Jianglong ◽  
Yu Ling
Keyword(s):  
Ion Beam ◽  
Ion Source ◽  
Neutral Beam Injection ◽  
Beam Divergence ◽  
Neutral Beam ◽  
Divergence Angle ◽  
Beam Extraction ◽  
Beam Injection ◽  
Back Plate ◽  
Beam Divergence Angle

During the process of beam extraction in positive ion source under high voltage region, a large number of electrons are produced in the gaps of grids. After back-streaming acceleration, these electrons go back to arc chamber or impinge grids and then heat back plate or grids, which are harmful for the safety of ion source. Under the situation of poor beam extraction optics, a large part of the primary beam ions bombard the surface of suppressor grid (SG). And this process produces a large number of electrons. Due to the huge extracted voltage, the secondary electron emission coefficient of the SG surface is also high. As a result, the grids' current grows. According to the measurement of the current of SG and the calculation of the perveance of the corresponding shoot, the effect of ion beam divergence angle on back-streaming electrons can be analyzed. When the beam divergence angle increases, the number of back-streaming electrons increases rapidly, and grids' current changes significantly, especially the current of gradient grid and SG. The results can guide the parameters operating on the ion source for Experimental Advanced Superconducting Tokamak-neutral beam injection (EAST-NBI) and find the reasonable operation interval of perveance and to ensure the safety and stable running of the ion source, which has great significance on the development of long pulse, high power ion source.

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