Ion emission simulations of the nano-aperture ion source

2019 ◽  
pp. 307-342
Author(s):  
Leon van Kouwen
Keyword(s):  
Ion Source ◽  
Ion Emission

Ion-emission properties of a plasma in a gaseous-ion source with a plasma cathode

2004 ◽  
Vol 49 (1) ◽  
pp. 19-21
Author(s):  
N. V. Gavrilov ◽  
A. S. Kamenetskikh
Keyword(s):  
Ion Source ◽  
Plasma Cathode ◽  
Emission Properties ◽  
Ion Emission

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

2017 ◽  
Author(s):  
Chundong Hu ◽  
Mingshan Wu ◽  
Yahong Xie ◽  
Jianglong Wei ◽  
Ling Yu
Keyword(s):  
Cross Section ◽  
Secondary Electron Emission ◽  
Circular Cross Section ◽  
Ion Source ◽  
Beam Divergence ◽  
Divergence Angle ◽  
Beam Extraction ◽  
Emission Surface ◽  
Ion Emission ◽  
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 heat electron dump 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. And this process produces a large number of electrons. Due to the huge extracted voltage, the secondary electron emission coefficient of the suppressor grid surface is also great, when beam ions bombard on it. As a result, the grids’ current grows. The curvature of ion emission surface and equipotential surface nearby are mainly connected to the perveance and plasma grid geometry. In order to optimize the beam performance of high current ion source and increase the mean arc efficiency, the plasma grid of accelerator is already replaced from circular cross section grid to diamond cross section grid. As a result, the shape of ion emission surface is only connected to the perveance. According the measurement of the current of suppressor grid and the calculation of the perveance of the corresponding shoot, we can analyze the effect of beam divergence angle on back-streaming electron. 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 suppressor grid. The results can guide the parameters operating on the ion source for EAST-NBI and find the reasonable operation interval of perveance and the best one 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.

Close-spaced ion emission from gold and gallium liquid metal ion source

1987 ◽  
Vol 181 (1-2) ◽  
pp. 362-369 ◽  
Author(s):  
G. Ben Assayag ◽  
P. Sudraud ◽  
L.W. Swanson
Keyword(s):  
Liquid Metal ◽  
Metal Ion ◽  
Ion Source ◽  
Ion Emission

scholarly journals Ion Emission Regulator for the Surface Ionization Ion Source

1973 ◽  
Vol 21 (4) ◽  
pp. 263-270 ◽  
Author(s):  
SHIGETOMO KITA ◽  
KENICHI NIURAO ◽  
HOKOTOMO INOUYE
Keyword(s):  
Ion Source ◽  
Surface Ionization ◽  
Ion Emission

Zn and Si Ion Emission from Au-Zn-Si LM Ion Source

1987 ◽  
Vol 26 (Part 2, No. 4) ◽  
pp. L253-L254 ◽  
Author(s):  
Hiroshi Arimoto ◽  
Eizo Miyauchi ◽  
Hisao Hashimoto
Keyword(s):  
Ion Source ◽  
Ion Emission

Enhanced secondary ion emission with a bismuth cluster ion source

2007 ◽  
Vol 262 (1-2) ◽  
pp. 144-153 ◽  
Author(s):  
G. Nagy ◽  
A.V. Walker
Keyword(s):  
Ion Source ◽  
Secondary Ion Emission ◽  
Cluster Ion Source ◽  
Cluster Ion ◽  
Bismuth Cluster ◽  
Ion Emission ◽  
Secondary Ion

Ion emission and electric field characteristics in the liquid metal ion source with a new suppressor electrode

2011 ◽  
Vol 11 (5) ◽  
pp. S172-S176 ◽  
Author(s):  
Byeong Seong Cho ◽  
Hyun Joo Oh ◽  
Han S. Uhm ◽  
Seung Oun Kang ◽  
Changjo Kim ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Electric Field ◽  
Metal Ion ◽  
Ion Source ◽  
Ion Emission

Close-space ion emission from gold and gallium liquid metal ion source

1987 ◽  
Vol 181 (1-2) ◽  
pp. A99
Author(s):  
G.Ben Assayag ◽  
P. Sudraud ◽  
L.W. Swanson
Keyword(s):  
Liquid Metal ◽  
Metal Ion ◽  
Ion Source ◽  
Ion Emission

Lithium ion emission from a liquid metal ion source of LiNO3

1989 ◽  
Vol 88 (1) ◽  
pp. 59-68 ◽  
Author(s):  
A.E. Bell ◽  
G.A. Schwind ◽  
S. Rao ◽  
L.W. Swanson
Keyword(s):  
Liquid Metal ◽  
Metal Ion ◽  
Lithium Ion ◽  
Ion Source ◽  
Ion Emission
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