Effects of the extraction voltage on the beam divergence for a H− ion source

2019 ◽  
Vol 126 (12) ◽  
pp. 123303
Author(s):  
M. Lindqvist ◽  
S. Nishioka ◽  
K. Miyamoto ◽  
K. Hoshino ◽  
J. Lettry ◽  
...  
Keyword(s):  
Ion Source ◽  
Beam Divergence ◽  
Extraction Voltage

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.

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.

scholarly journals Decreased beam divergence in proof-of-principle experiment for the light ion beam fusion facility PBFA II

1985 ◽  
Vol 3 (1) ◽  
pp. 93-105 ◽  
Author(s):  
J. P. Vandevender ◽  
J. A. Swegle ◽  
D. J. Johnson ◽  
K. W. Bieg ◽  
E. J. T. Burns ◽  
...  
Keyword(s):  
Current Density ◽  
Ion Beam ◽  
Ion Source ◽  
Beam Divergence ◽  
Anode Current Density ◽  
Anode Current ◽  
Lithium Ions ◽  
Short Pulses ◽  
Proof Of Principle

The Proto-I experiment for a proof-of-principle experiment is described resulting in a beam divergence for ions of only 14mrad at 1·5 MV—420 KA operation and 6 KA/cm2 anode current density before focusing. This is a better beam divergence than required for Sandia National Laboratories' PBFA I and II installations, for which scaling is discussed. Ion source development is reported and the PBFA II experiment described for 30 MV operation with short pulses (10–15 nsec) of lithium ions. Pulses of 50 nsec width and 130 KJ energy have been achieved from the prototype module for PBFA II.

Extracted-Beam Divergence Calculations for a Liquid-Metal Ion Source

1982 ◽  
Vol 21 (Part 2, No. 3) ◽  
pp. L155-L156 ◽  
Author(s):  
Tohru Ishitani ◽  
Hidemi Koike ◽  
Noriyuki Sakudo
Keyword(s):  
Liquid Metal ◽  
Metal Ion ◽  
Ion Source ◽  
Beam Divergence

scholarly journals Development of a new high-current triode extraction system for helicon ion source: design and simulation

2018 ◽  
Vol 36 (4) ◽  
pp. 477-486 ◽  
Author(s):  
M. Khoshhal ◽  
M. Habibi ◽  
Rod W. Boswell
Keyword(s):  
Ion Implantation ◽  
Ion Beam ◽  
Ion Source ◽  
High Current ◽  
Ion Temperature ◽  
Beam Emittance ◽  
Extraction Voltage ◽  
Parabolic Geometry ◽  
First Time ◽  
Plasma Electrode

AbstractThree triode extraction systems are simulated by IBSimu ion optical code for Amirkabir Helicon Ion Source (AHIS). The optimized pierce and suggested parabolic electrodes are introduced for the first time in this paper. The obtained N+ beam for parabolic geometry designed for ion implantation has 66 keV energy, and 10.4 mA current. Ion beam emittance and Twiss parameters of the emittance ellipse as the function of x term index are calculated for parabolic electrode equation. The simulated triode extraction systems have been evaluated by using of optimized parameters such as the extraction voltage, gap distance, plasma electrode (PE) aperture, and ion temperature. The extraction voltage, gap distance, PE aperture, and ion temperature have been changed in the range of 58–70 kV, 35–39 mm, 4–6 mm, and 0.5–4.4 eV in the simulations, respectively.

Study of Beam Divergence of a Low-Energy (1–3 keV) Ion Source

1983 ◽  
Vol 22 (Part 1, No. 6) ◽  
pp. 1071-1071 ◽  
Author(s):  
Kiyoshi Yatsu ◽  
Shinichi Aoki ◽  
Akira Horie ◽  
Syoich Miyoshi ◽  
Kanzi Ōta ◽  
...  
Keyword(s):  
Ion Source ◽  
Low Energy ◽  
Beam Divergence

scholarly journals Измерения эмиттанса газодинамического электронно-циклотронного резонансного источника ионов

2021 ◽  
Vol 47 (10) ◽  
pp. 7
Author(s):  
С.В. Барабин ◽  
Г.Н. Кропачев ◽  
А.Ю. Лукашин ◽  
Т.В. Кулевой ◽  
С.С. Выбин ◽  
...  
Keyword(s):  
Neutron Source ◽  
Repetition Rate ◽  
Ion Beams ◽  
Ion Source ◽  
Electron Cyclotron ◽  
Proton Accelerator ◽  
Extraction Voltage ◽  
Proton Source ◽  
Current Duration

Advantages of using a gasdynamic electron cyclotron ion source in a proton accelerator based compact neutron source DARIA are discussed. It is experimentally demonstrated that the gasdynamic proton source is able to provide ion beams with 100 mA current, duration from 100 microseconds and longer at repetition rate up to 1 kHz. Emittance of the ion beams produced by the gasdynamic ion source was measured using a “pepper-pot” method for two extraction electrodes geometries: “spherical” and flat parallel. It is shown that the normalized 4 rms emittance value for both electrode configurations in the range of extraction voltage from 41 t 48 kV does not exceed 2 mm mrad.

scholarly journals Current status of the compact 2.45 GHz ECR Ion Source at FLNR JINR

2019 ◽  
Vol 201 ◽  
pp. 08002
Author(s):  
Riyaz Fatkullin ◽  
Sergey Bogomolov ◽  
Andrey Efremov ◽  
Vladimir Loginov ◽  
Yuri Kostukhov ◽  
...  
Keyword(s):  
Current Density ◽  
High Frequency ◽  
Test Bench ◽  
Ion Source ◽  
Ion Sources ◽  
Current Status ◽  
Hydrogen Ions ◽  
Ecr Ion Source ◽  
Ultra High Frequency ◽  
Extraction Voltage

This paper describes recent results obtained with a compact 2.45 GHz ECR Ion Source at the ECR ion sources test bench. The source was tested for production of helium and hydrogen ions with different configurations of Ultra High Frequency (UHF) coupler, UHF power and frequency. At the extraction voltage about of 10 kV and UHF power about of 100 W more than 500 µA of He + ions were produced with the extraction hole of 3 mm in diameter that corresponds to the current density of 7.5mA/cm2. The future possible upgrades of the ion source are also discussed.

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