scholarly journals Towards kinetic models of electron transport in negative ion source presheath

2018 ◽  
Author(s):  
M. Cavenago
Keyword(s):  
Electron Transport ◽  
Kinetic Models ◽  
Ion Source ◽  
Negative Ion

Development of a low energy small electron gun to study electron transport in hydrogen negative ion source plasmas

2020 ◽  
Vol 91 (1) ◽  
pp. 013333
Author(s):  
Yoshikatsu Matsumoto ◽  
Masashi Kisaki ◽  
Katsuhiro Shinto ◽  
Haruhisa Nakano ◽  
Mamiko Sasao ◽  
...  
Keyword(s):  
Electron Transport ◽  
Ion Source ◽  
Low Energy ◽  
Electron Gun ◽  
Negative Ion

Integrodifferential models of electron transport for negative ion sources

2015 ◽  
Vol 81 (6) ◽  
Author(s):  
Marco Cavenago
Keyword(s):  
Electron Transport ◽  
Mean Free Path ◽  
Transverse Magnetic ◽  
Ion Source ◽  
Negative Ion ◽  
Larmor Radius ◽  
Magnetic Flux Density ◽  
Atomic Collisions ◽  
One Dimensional ◽  
Electron Production

Thanks to the presence of a transverse magnetic flux density ($B_{x}$ and $B_{y}$ where $z$ is the extraction axis), the undesired extraction of electrons from a negative ion source is reduced and it is due to collisions. The electron transport is studied with a kinetic model, including Vlasov–Poisson effects and atomic collisions. The integrodifferential equations (IDE) resulting from a reduction to a one-dimensional problem (1-D) by integration on characteristic orbits are strongly affected by the trapped orbits, as here evaluated; a kernel calculation with a partial wave approximation is introduced. Dependencies from the local drift velocity $v_{d}$ and effective Larmor radius $L_{e}$ are found. Solutions are investigated in simple cases with a constant electron current (no additional electron production). Equilibrium solution and electron conductivity are analytically obtained. Presheath solutions are discussed; the approximated conversion to differential equations that are adequate for presheath only (with moderated electric field gradient $E_{z,z}>-eB_{x}^{2}/m$) and their numeric solutions coupled to Poisson equation are reported, and compared to iterative IDE solutions. Examples with different values of $L_{e}$ and mean free path (mfp) ratio are described.

scholarly journals Study of electron transport across the magnetic filter of NIO1 negative ion source

2017 ◽  
Author(s):  
P. Veltri ◽  
E. Sartori ◽  
M. Cavenago ◽  
G. Serianni ◽  
M. Barbisan ◽  
...  
Keyword(s):  
Electron Transport ◽  
Ion Source ◽  
Negative Ion ◽  
Magnetic Filter

Simulation of electron transport in newly designed large volume ion source.

1994 ◽  
Vol 6 (1) ◽  
pp. 1-4
Author(s):  
Kazutaka KAWAMURA ◽  
Eiji YABE ◽  
Keiji TAKAHASHI ◽  
Kazuo TAKAYAMA
Keyword(s):  
Electron Transport ◽  
Large Volume ◽  
Ion Source

First result of CRDS system with cesium operation for radiofrequency negative ion source test facility at ASIPP

2021 ◽  
Vol 166 ◽  
pp. 112266
Author(s):  
Lizhen Liang ◽  
Chundong Hu ◽  
Wei Liu ◽  
Jianglong Wei ◽  
Yongjian Xu ◽  
...  
Keyword(s):  
Ion Source ◽  
Negative Ion ◽  
Test Facility ◽  
Source Test

Characteristics of extracted ion beam from a cesium-free negative ion source using sheet plasma

2020 ◽  
Vol 91 (11) ◽  
pp. 113302
Author(s):  
H. Kaminaga ◽  
T. Takimoto ◽  
A. Tonegawa ◽  
K. N. Sato
Keyword(s):  
Ion Beam ◽  
Ion Source ◽  
Negative Ion ◽  
Sheet Plasma

Development of a set of movable electrostatic probes to characterize the plasma in the ITER neutral beam negative-ion source prototype

2021 ◽  
Vol 169 ◽  
pp. 112424
Author(s):  
E. Sartori ◽  
M. Brombin ◽  
B. Laterza ◽  
M. Zuin ◽  
R. Cavazzana ◽  
...  
Keyword(s):  
Ion Source ◽  
Negative Ion ◽  
Neutral Beam
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