Radiofrequency Gaseous Detection Device

2000 ◽  
Vol 6 (1) ◽  
pp. 12-20
Author(s):  
Gerasimos D. Danilatos
Keyword(s):  
Electromagnetic Field ◽  
Ion Beam ◽  
Free Electrons ◽  
Particle Beams ◽  
Charged Particle Beams ◽  
Multiple Collisions ◽  
Electron Microscopes ◽  
Ionizing Radiations ◽  
Low Pressures ◽  
Photon Signal

Abstract A radiofrequency gaseous detection device is proposed for use with instruments employing charged particle beams, such as electron microscopes and ion beam technologies, as well as for detection of ionizing radiations as in proportional counters. An alternating (oscillating) electromagnetic field in the radiofrequency range is applied in a gaseous environment of the instrument. Both the frequency and amplitude of oscillation are adjustable. The electron or ion beam interacts with a specimen and releases free electrons in the gas. Similarly, an ionizing radiation source releases free electrons in the gas. The free electrons are acted upon by the alternating electromagnetic field and undergo an oscillatory motion resulting in multiple collisions with the gas molecules, or atoms. At sufficiently low pressures, the oscillating electrons also collide with surrounding walls. These processes result in an amplified electron signal and an amplified photon signal in a controlled discharge. The amplified signals, which are proportional to the initial number of free electrons, are collected by suitable means for further processing and analysis.

Radiofrequency Gaseous Detection Device

2000 ◽  
Vol 6 (1) ◽  
pp. 12-20 ◽  
Author(s):  
Gerasimos D. Danilatos
Keyword(s):  
Electromagnetic Field ◽  
Ion Beam ◽  
Free Electrons ◽  
Particle Beams ◽  
Charged Particle Beams ◽  
Multiple Collisions ◽  
Electron Microscopes ◽  
Ionizing Radiations ◽  
Low Pressures ◽  
Photon Signal

A radiofrequency gaseous detection device is proposed for use with instruments employing charged particle beams, such as electron microscopes and ion beam technologies, as well as for detection of ionizing radiations as in proportional counters. An alternating (oscillating) electromagnetic field in the radiofrequency range is applied in a gaseous environment of the instrument. Both the frequency and amplitude of oscillation are adjustable. The electron or ion beam interacts with a specimen and releases free electrons in the gas. Similarly, an ionizing radiation source releases free electrons in the gas. The free electrons are acted upon by the alternating electromagnetic field and undergo an oscillatory motion resulting in multiple collisions with the gas molecules, or atoms. At sufficiently low pressures, the oscillating electrons also collide with surrounding walls. These processes result in an amplified electron signal and an amplified photon signal in a controlled discharge. The amplified signals, which are proportional to the initial number of free electrons, are collected by suitable means for further processing and analysis.

scholarly journals Lorentz Scanning Electron/Ion Microscopy

Microscopy ◽  
2021 ◽  
Author(s):  
Ken Harada ◽  
Keiko Shimada ◽  
Yoshio Takahashi
Keyword(s):  
Electromagnetic Fields ◽  
Measurement Method ◽  
Ion Beam ◽  
Electron Holography ◽  
Force Model ◽  
Reconstruction Technique ◽  
Visualization Technique ◽  
Particle Beams ◽  
Charged Particle Beams ◽  
Scanning Electron

Abstract We have developed an observation and measurement method for spatial electromagnetic fields by using scanning electron/ion microscopes, combined with electron holography reconstruction technique. A cross-grating was installed below the specimen, and the specimens were observed under the infocus condition, and the grating was simultaneously observed under the defocus condition. Electromagnetic fields around the specimen were estimated from grating-image distortions. This method is effective for low and middle magnification and resolution ranges; furthermore, this method can in principle be realizable in any electron/ion beam instruments because it is based on the Lorentz force model for charged particle beams. Mini Abstract We have developed a visualization technique for spatial electromagnetic fields by using scanning electron/ion microscopes, combined with electron holography reconstruction technique. A specimen and a cross-grating installed below the specimen were observed simultaneously. The distorted grating image caused by electromagnetic fields around the specimen were quantitatively measured and visualized.

scholarly journals A simple model of ion beam heated ICF targets

1983 ◽  
Vol 1 (3) ◽  
pp. 231-239 ◽  
Author(s):  
R. G. Evans
Keyword(s):  
Computer Simulation ◽  
Charged Particle ◽  
Simple Model ◽  
Ion Beam ◽  
Laser Beams ◽  
Particle Beams ◽  
Charged Particle Beams ◽  
Hydrodynamic Behaviour ◽  
Temperature And Pressure ◽  
Good Agreement

A simple model is presented for the thermodynamic and hydrodynamic behaviour of solid targets heated by intense charged particle beams. The model gives the temperature and pressure generated by the beam and allows a direct comparison with the pressure generated by laser beams. The model is in good agreement with a coupled thermodynamic hydrodynamic computer simulation.

scholarly journals Industrial applications of pulse power and particle beams

1989 ◽  
Vol 7 (4) ◽  
pp. 733-741 ◽  
Author(s):  
Kiyoshi Yatsui
Keyword(s):  
Surface Modification ◽  
Charged Particle ◽  
Short Wavelength ◽  
Ion Beam ◽  
Industrial Applications ◽  
Ion Beams ◽  
Pulse Power ◽  
Particle Beams ◽  
X Ray ◽  
Charged Particle Beams

An overview is given of recent progress in the industrial applications of intense pulse power and associated particle beams, except for activities in inertial confinement fusion. In particular, several topics are discussed which relate to the applications in the R&D of materials, the excitation of short wavelength lasers, the generation of charged particle beams, and the development of plasma X-ray sources.I. Applications in material processing. If intense pulsed charged particle beams are directed onto materials, only their surfaces where the beam energy is deposited are quickly heated up to very high temperatures. Using the pulsed beam in this way, we might expect to apply them in R&D of materials. Several novel attempts have been made, e.g., on the preparation of thin films by use of a high-density high-temperature plasma, surface modification by surface heating, and ion-beam mixing of multi-layers by use of the focused electron or ion beams, and so on. Furthermore, experimental studies have been done on the surface modification by ion implantation and the evaluation of the damage due to the irradiation by ion beams.II. Applications in the excitation of short wavelength lasers. Activities in the excitation of high-power, short wavelength lasers by using electron beams or ion beams have increased considerably.III. Applications in the generation of charged particle beams, and the development of plasma X-ray source. With regard to new accelerator technologies, several attempts are underway on the application of the modified betatron or the development of a convergent electron beam accelerator with a plasma cathode.

scholarly journals Ion and Electron Beam Processing of Condensed Molecular Solids to Form Thin Films

1992 ◽  
Vol 279 ◽  
Author(s):  
M. W. Ruckman ◽  
J. K. Mowlem ◽  
J. F. Moore ◽  
D. R. Strongin ◽  
M. Strongin
Keyword(s):  
Thin Films ◽  
Gas Phase ◽  
Ion Beam ◽  
Ion Beams ◽  
Molecular Solids ◽  
Volatile Species ◽  
Particle Beams ◽  
Charged Particle Beams ◽  
Electron Beam Processing ◽  
Physical And Chemical

ABSTRACTElectron and ion beams can be used to deposit thin films and etch surfaces using gas phase precursors. However, the generation of undesirable gas phase products and the diffusion of the reactive species beyond the region irradiated by the electron or ion beam can limit selectivity. Tn this paper, the feasibility of processing condensed precursors such as diborane, tri-methyl aluminum, ammonia and water at 78 K with low energy (100–1000 eV) electron and ion beams (Ar+, N2+ and H2+) ranging in current density from 50 nA to several μ a per cm2 is examined. It was found that boron, boron nitride and stoichiometric aluminum oxide films could be deposited from the condensed volatile species using charged particle beams and some of the physical and chemical aspects and limitations of this new technique are discussed.

scholarly journals Charge identification of fragments with the emulsion spectrometer of the FOOT experiment

Open Physics ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 383-394
Author(s):  
Giuliana Galati ◽  
Andrey Alexandrov ◽  
Behcet Alpat ◽  
Giovanni Ambrosi ◽  
Stefano Argirò ◽  
...  
Keyword(s):  
Charged Particle ◽  
Dynamic Range ◽  
Ion Beam ◽  
Particle Therapy ◽  
Particle Beams ◽  
Cross Sectional ◽  
Charged Particle Beams ◽  
Oxygen Ion ◽  
Charged Particle Therapy ◽  
Target Experiment

Abstract The FOOT (FragmentatiOn Of Target) experiment is an international project designed to carry out the fragmentation cross-sectional measurements relevant for charged particle therapy (CPT), a technique based on the use of charged particle beams for the treatment of deep-seated tumors. The FOOT detector consists of an electronic setup for the identification of Z ≥ 3 Z\ge 3 fragments and an emulsion spectrometer for Z ≤ 3 Z\le 3 fragments. The first data taking was performed in 2019 at the GSI facility (Darmstadt, Germany). In this study, the charge identification of fragments induced by exposing an emulsion detector, embedding a C 2 H 4 {{\rm{C}}}_{2}{{\rm{H}}}_{4} target, to an oxygen ion beam of 200 MeV/n is discussed. The charge identification is based on the controlled fading of nuclear emulsions in order to extend their dynamic range in the ionization response.

scholarly journals Shaping quantum photonic states using free electrons

2021 ◽  
Vol 7 (11) ◽  
pp. eabe4270 ◽  
Author(s):  
A. Ben Hayun ◽  
O. Reinhardt ◽  
J. Nemirovsky ◽  
A. Karnieli ◽  
N. Rivera ◽  
...  
Keyword(s):  
Free Electron ◽  
Degrees Of Freedom ◽  
Free Electrons ◽  
Complete Control ◽  
Fock State ◽  
Judicious Choice ◽  
Electron Microscopes ◽  
Photonic States ◽  
Photonic Cavities ◽  
Electron Interactions

It is a long-standing goal to create light with unique quantum properties such as squeezing and entanglement. We propose the generation of quantum light using free-electron interactions, going beyond their already ubiquitous use in generating classical light. This concept is motivated by developments in electron microscopy, which recently demonstrated quantum free-electron interactions with light in photonic cavities. Such electron microscopes provide platforms for shaping quantum states of light through a judicious choice of the input light and electron states. Specifically, we show how electron energy combs implement photon displacement operations, creating displaced-Fock and displaced-squeezed states. We develop the theory for consecutive electron-cavity interactions with a common cavity and show how to generate any target Fock state. Looking forward, exploiting the degrees of freedom of electrons, light, and their interaction may achieve complete control over the quantum state of the generated light, leading to novel light statistics and correlations.

Characterization of 2D Al2O3:C,Mg radiophotoluminescence films in charged particle beams

2021 ◽  
Vol 141 ◽  
pp. 106518
Author(s):  
Marijke De Saint-Hubert ◽  
Fabio Castellano ◽  
Paul Leblans ◽  
Paul Sterckx ◽  
Satoshi Kodaira ◽  
...  
Keyword(s):  
Charged Particle ◽  
Particle Beams ◽  
Charged Particle Beams
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