Results 1 to 10 of about 14,078 (116)

Analysis of the DEMO-FNS magnetic field passive reduction and neutral beam injectors shielding methods

SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020), 2021
Steady-state operation of a fusion neutron source (FNS) will require plasma heating and maintaining the current therein by fast atom beam injection. The DEMO-FNS project assumes the use of six injectors providing additional heating power up to 30 MW at ...
S. Ananyev, E. Dlougach, A. V. Klishchenko   +2 more
semanticscholar   +1 more source

Effect of H atoms and O impurities on the adsorption stability and work function of the cesiated Mo(0 0 1) surface: A study about negative hydrogen ion sources for neutral beam injection systems

Nuclear Materials and Energy, 2023
The impact of H atoms and O impurities on the adsorption stability and work function of cesiated Mo (001) surface are investigated in this paper through DFT calculations. The 53 surface structures with different surface coverages are constructed in this work. Two types of co-deposition structures are considered: Cs-O (or Cs-H) bonds (1) leaning towards
Heng Li, Xin Zhang, Yuhong Xu, Guangjiu Lei, Sanqiu Liu, Katsuyoshi Tsumori, Haruhisa Nakano, Masaki Osakabe, Mitsutaka Isobe, Shoichi Okamura, Akihiro Shimizu, Kunihiro Ogawa, Hiromi Takahashi, Zilin Cui, Jun Hu, Yiqin Zhu, Xiaolong Li, Huaqing Zheng, Xiaoqiao Liu, Shaofei Geng, Xiaochang Chen, Haifeng Liu, Xianqu Wang, Hai Liu, Changjian Tang, CFQS team   +25 more
openaire   +2 more sources

Dynamics of the transport of ionic and atomic cesium in radio frequency-driven ion sources for ITER neutral beam injection [PDF]

Plasma Physics and Controlled Fusion, 2011
The neutral beam injection heating system of the future ITER fusion experiment will rely on the acceleration and neutralization of negative hydrogen ions. Cesium seeding into negative-ion sources is a prerequisite to obtain the required ion current at a maximum pressure of 0.3 Pa and a tolerable level of co-extracted electrons.
Gutser, R., Wünderlich, D., Fantz, U., N-NBI Team   +3 more
openaire   +4 more sources

Early Time Evolution of Turbulence in the Space Environment by Neutral Beam Injection

Journal of Geophysical Research - Space Physics, 2020
The Space Measurement of A Rocket‐released Turbulence mission will demonstrate the production and evolution of turbulence in the space environment via a cascade of plasma physics processes.
A. Fletcher, C. Crabtree, J. Huba, G. Ganguli, C. Siefring   +4 more
semanticscholar   +1 more source

TALIF at H− ion sources for the determination of the density and EDF of atomic hydrogen

Journal of Physics D: Applied Physics, 2023
The production of H− ions in negative ion sources relevant for particle accelerator facilities and neutral beam injection systems is based predominantly on the surface conversion of H atoms at a low work function surface covered with caesium (the plasma ...
F. Merk, C. Wimmer, S. Briefi, U. Fantz
semanticscholar   +1 more source

Plasma instabilities driven by pickup ions of ring-beam velocity distributions in the outer heliosheath 

, 2021
The stability of the pickup ions in the outer heliosheath has been studied by many researchers because of its relevance to the energetic neutral atom (ENA) ribbon observed by the Interstellar Boundary EXplorer.
A. Mousavi, Kaijun Liu, Sina Sadeghzadeh
semanticscholar   +1 more source

Monte Carlo simulation of neutral-beam injection for mirror fusion reactors

, 1979
Computer simulation techniques using the Monte Carlo method have been developed for application to the modeling of neutral-beam intection into mirror-confined plasmas of interest to controlled thermonuclear research. The energetic (10 to 300 keV) neutral-
R. 1. Miller
semanticscholar   +1 more source

Effect of Cs atoms adsorption on the work function of the LaB6 (100) surface

Nuclear Materials and Energy
This study used first-principles density functional theory with cp2k and VASP software to investigate the effects of Cs atoms adsorption on the work function of the LaB6 (100) surface.
Huaqing Zheng, Xin Zhang, Jun Hu, Yuhong Xu, Guangjiu Lei, Sanqiu Liu, Heng Li, Zilin Cui, Yiqin Zhu, Xiaolong Li, Xiaoqiao Liu, Shaofei Geng, Xiaochang Chen, Haifeng Liu, Xianqu Wang, Hai Liu, Jun Cheng, Changjian Tang   +17 more
doaj   +1 more source

Use of liquid spray for conversion of a positive ion into a negative ion and a neutral atom

Journal of Physics, Conference Series
Beams of energetic positive ions—specifically hydrogen and carbon ions—were converted into beams of negative ions and neutral atoms as they passed through a spray of submicron liquid droplets.
S. Ter-Avetisyan, M. Schnürer, V. Tikhonchuk   +2 more
semanticscholar   +1 more source

The influence of hydrogen and impurities on the work function of multilayer Cs atoms on the plasma grid: An ab-initio molecular dynamics study about negative hydrogen ion sources for neutral beam injection systems

Nuclear Materials and Energy
We conducted ab-initio molecular dynamics simulations to investigate the migration of hydrogen and impurities (oxygen or copper) and their impact on the work function of cesiated surfaces under different cesium coverages. To ensure temperature and energy stability, all simulations were divided into pre-equilibrium and equilibrium phases, with more ...
Xin Zhang, Heng Li, Katsuyoshi Tsumori, Yuhong Xu, Mitsutaka Isobe, Guangjiu Lei, Sanqiu Liu, Masaki Osakabe, Haruhisa Nakano, Akihiro Shimizu, Shoichi Okamura, Kunihiro Ogawa, Hiromi Takahashi, Zilin Cui, Jun Hu, Yiqin Zhu, Xiaolong Li, Xiaoqiao Liu, Huaqing Zheng, Shaofei Geng, Xiaochang Chen, Haifeng Liu, Xianqu Wang, Hai Liu, Jun Chen, Changjian Tang   +25 more
openaire   +2 more sources