Results 31 to 40 of about 4,890 (116)

Instrumentation for Negative Ion Detection [PDF]

Environmental Health Perspectives, 1980
The instrumentation and practical circuitry required for the detection of negative ions exiting the mass analysis section of a mass spectrometer is examined. The potentials needed to bias the electron multiplier when detecting negative ions from a low ion-energy mass spectrometer, e.g., a quadrupole, are contrasted with the biasing requirements of a ...
openaire   +2 more sources

Negative ion beam space charge compensation by residual gas

Physical Review Special Topics. Accelerators and Beams, 2015
The space charge of intense unbunched ion beams can be compensated by the ions created when the beam ionizes the residual gas, which creates a source of secondary particles inside the beam pipe.
Cristhian A. Valerio-Lizarraga, Ildefonso Leon-Monzon, Richard Scrivens   +2 more
doaj   +1 more source

Novel Approaches for Intensifying Negative C₆₀ Ion Beams Using Conventional Ion Sources Installed on a Tandem Accelerator

Quantum Beam Science, 2020
We developed novel methods for producing negative C60 ion beams at the accelerator facility Takasaki Ion Accelerators for Advanced Radiation Application (TIARA) to increase the current intensity of swift C60 ion beams accelerated to the MeV energy region
Atsuya Chiba, Aya Usui, Yoshimi Hirano, Keisuke Yamada, Kazumasa Narumi, Yuichi Saitoh   +5 more
doaj   +1 more source

Correlation of source parameters and beam properties in the early operation of the full size ITER negative ion beam source

Nuclear Fusion
One of the requirements of Heating and current drive Neutral Beam injectors for ITER is a beam homogeneity greater than 90%, to achieve an optimal beam transmission while keeping the heat load consistently low on the acceleration electrodes.
M. Ugoletti, M. Agostini, C. Poggi, E. Sartori, G. Serianni, B. Zaniol   +5 more
doaj   +1 more source

Helicon wave-generated plasmas for negative ion beams for fusion

EPJ Web of Conferences, 2017
In the next generation of fusion reactors, such as DEMO, neutral beam injectors (NBIs) of high energy (0.8-1 MeV) deuterium atoms with high wall-plug efficiency (>50%) will be required to reach burning plasma conditions and to provide a significant ...
Furno Ivo, Agnello Riccardo, Fantz U., Howling Alan, Jacquier Remy, Marini Claudio, Plyushchev Gennady, Guittienne Philippe, Simonin Alain   +8 more
doaj   +1 more source

Response of negative ion beamlet width and axis deflection to RF field in beam extraction region

Scientific Reports
Beam-divergence characteristics of single negative ion beamlet have been experimentally investigated with a superimposition of a controlled perturbation of a radio frequency wave (RF) field in a filament-arc discharge negative ion source. Oscillations of
Kenichi Nagaoka, Haruhisa Nakano, Taiga Hamajima, Ryoya Nakamoto, Katsuyoshi Tsumori, Masaki Osakabe, Masashi Kisaki, Kenji Miyamoto, Kazunori Takahashi, Ursel Fantz   +9 more
doaj   +1 more source

SF₆ Negative Ion Formation in Charge Transfer Experiments

Molecules
In the present work, we report an update and extension of the previous ion-pair formation study of Hubers, M.M.; Los, J. Chem. Phys. 1975, 10, 235–259, noting new fragment anions from time-of-flight mass spectrometry.
Sarvesh Kumar, Masamitsu Hoshino, Boutheïna Kerkeni, Gustavo García, Ghofrane Ouerfelli, Muneerah Mogren Al-Mogren, Paulo Limão-Vieira   +6 more
doaj   +1 more source

An overview of negative hydrogen ion sources for accelerators

New Journal of Physics, 2018
An overview of high current (>1 mA) negative hydrogen ion (H ^– ) sources that are currently used on particle accelerators. The current understanding of how H ^– ions are produced is summarised. Issues relating to caesium usage are explored.
Dan Faircloth, Scott Lawrie
doaj   +1 more source

Large amplitude ion-acoustic solitons in warm negative ion plasmas with superthermal electrons

AIP Advances, 2017
Large amplitude ion-acoustic solitons are investigated in a plasma consisting of warm adiabatic positive and negative-ions and hot superthermal electrons having kappa distributions. Using Pseudo-potential method an energy integral equation is derived for
Kishan Kumar, M. K. Mishra
doaj   +1 more source

Consequences of negative ions for Titan's plasma interaction

Geophysical Research Letters, 2012
A hybrid particle code has been used to examine how Titan's interaction with Saturn's magnetosphere is affected by the presence of negative ions in Titan's ionosphere.
Stephen A. Ledvina, Stephen H. Brecht
doaj   +1 more source