# Ion Emission

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# 115 resources related to Ion Emission

### IEEE Organizations related to Ion Emission

No organizations are currently tagged "Ion Emission"

### Conferences related to Ion Emission

2021 IEEE Pulsed Power Conference (PPC)

The Pulsed Power Conference is held on a biannual basis and serves as the principal forum forthe exchange of information on pulsed power technology and engineering.

2020 IEEE 21st International Conference on Vacuum Electronics (IVEC)

Technical presentations will range from the fundamental physics of electron emission and modulated electron beams to the design and operation of devices at UHF to THz frequencies, theory and computational tool development, active and passive components, systems, and supporting technologies.System developers will find that IVEC provides a unique snapshot of the current state-of-the-art in vacuum electron devices. These devices continue to provide unmatched power and performance for advanced electromagnetic systems, particularly in the challenging frequency regimes of millimeter-wave and THz electronics.Plenary talks will provide insights into the history, the broad spectrum of fundamental physics, the scientific issues, and the technological applications driving the current directions in vacuum electronics research.

2020 IEEE International Conference on Plasma Science (ICOPS)

IEEE International Conference on Plasma Science (ICOPS) is an annual conference coordinated by the Plasma Science and Application Committee (PSAC) of the IEEE Nuclear & Plasma Sciences Society.

2020 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

All areas of ionizing radiation detection - detectors, signal processing, analysis of results, PET development, PET results, medical imaging using ionizing radiation

2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)

The world's premiere conference in MEMS sensors, actuators and integrated micro and nano systems welcomes you to attend this four-day event showcasing major technological, scientific and commercial breakthroughs in mechanical, optical, chemical and biological devices and systems using micro and nanotechnology.The major areas of activity in the development of Transducers solicited and expected at this conference include but are not limited to: Bio, Medical, Chemical, and Micro Total Analysis Systems Fabrication and Packaging Mechanical and Physical Sensors Materials and Characterization Design, Simulation and Theory Actuators Optical MEMS RF MEMS Nanotechnology Energy and Power

### Periodicals related to Ion Emission

No periodicals are currently tagged "Ion Emission"

### Xplore Articles related to Ion Emission

2017 IEEE International Conference on Plasma Science (ICOPS), 2017

Summary form only given. A mission concept is under development which involves firing a spacecraft-mounted electron beam from Earth's magnetosphere to connect distant magnetic field lines in real time [1]. To prevent excessive spacecraft charging and consequent beam return, the spacecraft must be neutralized in the tenuous plasma environment of the magnetosphere. Particle- In-Cell (PIC) simulations suggest neutralization can be ...

2003 International Semiconductor Conference. CAS 2003 Proceedings (IEEE Cat. No.03TH8676), 2003

The absorption and radiation spectra of Ga-La-S-O glasses with fixed cation ratio Ga/La=0.7/0.3 and two oxygen content 0.65 Wt % and 2.95 Wt % were studied for two Pr/sup 3+/ doping levels of 0.1 and 1.0 Wt %. Presence of oxygen induces blue shift of the fundamental absorption edge and results in lowering of the low-energy components of the Pr/sup ...

9th International Vacuum Microelectronics Conference, 1996

Chemical composition and some field electron and ion emission characteristics of thermo-field formations of two alloys Ir-Rh (60% Rh) and W-Hf (3% Hf) have been studied by time of flight atom probe. A remarkable segregation of Rh on the surface of Ir-Rh alloy have been proved at different cases. Such parameters as field evaporation fields have been determined. Field electron ...

IVMC '95. Eighth International Vacuum Microelectronics Conference. Technical Digest (Cat. No.TH8012), 1995

It has been shown that the values of the static and alternating current in a liquid-metal ion source (LMIS) are determined by the magnitude of the liquid- metal viscous flow on the needle surface, appearing under the action of negative electric pressure in the vicinity of Taylor's cone base. The strong decreasing of current modulation degree at high frequencies is ...

IEEE Transactions on Nuclear Science, 1983

A new high-voltage scaling based on Kilpatrick's criterion is presented that suggests that voltages more than twice the Kilpatrick limit can be obtained with identical initial conditions of vacuum and surface cleanliness. The calculations are based on the experimentally observed decrease in secondary electron emission with increasing ion impact energy above 100 keV. A generalized secondary-emission package has been developed ...

### Educational Resources on Ion Emission

#### IEEE-USA E-Books

• Summary form only given. A mission concept is under development which involves firing a spacecraft-mounted electron beam from Earth's magnetosphere to connect distant magnetic field lines in real time [1]. To prevent excessive spacecraft charging and consequent beam return, the spacecraft must be neutralized in the tenuous plasma environment of the magnetosphere. Particle- In-Cell (PIC) simulations suggest neutralization can be accomplished by emitting a neutral plasma with the electron beam. Interpretation of these simulations also led to an ion emission model in which ion current is emitted from a quasineutral plasma as defined by the space charge limit [2], [3]. Experiments were performed at the University of Michigan's Plasmadyamics and Electric Propulsion Laboratory (PEPL) to help validate the ion emission model. The hollow cathode system was charged to several levels with respect to the chamber walls to examine its effect on ion emission. Retarding Potential Analyzer measurements were performed to understand ion flow velocity and direction as these parameters relate directly to ther expected space charge limit. Planar probe measurements were also made to identify where ion emission primarily occured and to determine current density level. Evidence of collisions within the plasma (particularly charge exchange collisions) and a simple model predicting ion drift energy are presented. While a detailed validation of the ion emission model and of the simulation tools used in[2,3] is ongoing, these measurements add to the physical understanding of ion emission as it may occur in the magnetosphere.

• The absorption and radiation spectra of Ga-La-S-O glasses with fixed cation ratio Ga/La=0.7/0.3 and two oxygen content 0.65 Wt % and 2.95 Wt % were studied for two Pr/sup 3+/ doping levels of 0.1 and 1.0 Wt %. Presence of oxygen induces blue shift of the fundamental absorption edge and results in lowering of the low-energy components of the Pr/sup 3+/ absorption bands. The glasses show bright luminescence due to Pr/sup 3+/ ion emission similar to that in other glasses. The effect of oxygen on the luminescence spectra is determined by decreasing of host glass self-absorption of the short-wavelength bands, which became visible with oxide content growing.

• Chemical composition and some field electron and ion emission characteristics of thermo-field formations of two alloys Ir-Rh (60% Rh) and W-Hf (3% Hf) have been studied by time of flight atom probe. A remarkable segregation of Rh on the surface of Ir-Rh alloy have been proved at different cases. Such parameters as field evaporation fields have been determined. Field electron emission of some thermo-field formation on Ir-Rh alloy has been investigated. High temperature field evaporation has been studied for the W-Hf alloy and some enrichment of evaporating flow by Hf is supposed.

• It has been shown that the values of the static and alternating current in a liquid-metal ion source (LMIS) are determined by the magnitude of the liquid- metal viscous flow on the needle surface, appearing under the action of negative electric pressure in the vicinity of Taylor's cone base. The strong decreasing of current modulation degree at high frequencies is determined by the inertia of the viscous flow. The obtained results allow one to determine the frequency range in which significant current modulation is possible when a comparatively low alternating voltage is supplied to the LMIS.

• A new high-voltage scaling based on Kilpatrick's criterion is presented that suggests that voltages more than twice the Kilpatrick limit can be obtained with identical initial conditions of vacuum and surface cleanliness. The calculations are based on the experimentally observed decrease in secondary electron emission with increasing ion impact energy above 100 keV. A generalized secondary-emission package has been developed to simulate actual cavity dynamics in conjunction with our 2½-dimensional fully electromagnetic particle-in-cell code CEMIT. The results are discussed with application to the suppression of vacuum breakdown in rf accelerator devices.

• The emission of excited neutrals and positive ions from the liquid metal surface in electric fields depends on thermal field processes. Such processes include interaction between the liquid metal surface and electron flux of high power density exceeding a threshold value P*, evaporation of neutrals activated by metal electron subsystem excitation, and lastly, field ionization of evaporating neutrals. All these processes are interrelated and cyclic in nature.

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• Spectra of the negative ion fraction in the low field emission from MPG-8 graphite with rough surface and tungsten surface with nano fuzz as a function of the residual gas composition and pressure are measured and analyzed. The intensity of the emitted negative ions increases linearly with the pressure of the working gas in the range of $10^{-5}$ to $10^{-7}~{\rm Torr}$ and depends on the atomic mass of the residual gas. A simple model based on the secondary negative ion emission of adsorbed particles under positive ion bombardment of the cathode is proposed.

• Summary form only given. Femtosecond laser ablation of positive ions from transparent, polished slides of single crystalline Al/sub 2/O/sub 3/ is studied by time-of-flight mass spectrometry. The incident fluence from an amplified Ti:Sapphire laser could be varied between 0.5 J/cm/sup 2/ and 2.7 J/cm/sup 2/, the maximum being well below the single-shot damage threshold for Al/sub 2/O/sub 3/ at 3.0 J/cm/sup 2/. We investigated the emission of positive ions, negative ions, and electrons, usually averaging the signals over several hundred pulses. All experiments were conducted in the previously described 'strong etch' regime, i.e. after a preceding incubation the samples show a strong response to the incident radiation. In this regime, the ion emission is characterized by a stable average rate, consisting of stochastically alternating pulses with high and with low yield. Thus, sampling over 500 pulses for each data point leads to stable, reliable, and reproducible results.

• The LION Accelerator, 1.5 MV, 4Ω, is being used to study the characteristics of an applied Brextraction diode. The diode utilizes both an inner and outer cathode and has been observed to operate at high ion current efficiencies compared to previous extraction diodes. Typical efficiencies were measured to be ≈ 80% which compare very favorably with the efficiencies seen in applied Bzdiodes. Here we report the results of a series of experiments examining the role of the inner cathode in electron loss and ion emission. In addition, operation with an argon gas cell is reported. The ion beam appears to be space-charge neutralized by the gas cell foil alone, and current neutralized when the gas cell pressure is above 100mT.