Numerical model of Ar-N2 laser with pumping by a high-current beam of charged particles

1980 ◽  
Vol 23 (12) ◽  
pp. 991-994 ◽  
Author(s):  
S. S. Sulakshin
Keyword(s):  
Numerical Model ◽  
Charged Particles ◽  
High Current

scholarly journals Nonlinear dynamics of radiation of high-current beams of charged particles in spatially periodic structures

2021 ◽  
pp. 62-72
Author(s):  
Svetlana N. Sytova
Keyword(s):  
Free Electron ◽  
High Efficiency ◽  
Periodic Structures ◽  
Wide Spectrum ◽  
Charged Particles ◽  
Travelling Wave ◽  
Free Electron Lasers ◽  
High Current ◽  
Spatially Periodic ◽  
Spectral Ranges

Provided a review of physical processes underlying the functioning of vacuum electronic devices, namely, nonlinear processes of radiation of  high-current beams of charged particles during their passage through spatially periodic structures (resonators) and their interaction with an electromagnetic field. Principles of functioning of travelling wave tubes, backward wave tubes, multi-wave Cherenkov generators, free electron lasers and free electron masers, volume free electron lasers are considered. These devices operate in a wide spectrum range from microwave to X-ray, have high efficiency, and allow obtaining high radiation powers in narrow spectral ranges. Increase the performance and reliability of electronic vacuum devices is based on improving the complex electromagnetic structures in resonators. The article demonstrates a variety of such devices with an obvious generality of physical principles used in them. Nonlinear chaotic dynamics of their functioning is considered. Particular attention is paid to consideration of principles of operation of volume free electron lasers as well as their difference from other devices.

The positive space charge lens for focusing and manipulating high-current beams of negatively charged particles (review)

2010 ◽  
Author(s):  
A. Goncharov ◽  
A. Dobrovolskiy ◽  
S. Dunets ◽  
A. Evsyukov ◽  
V. Gushenets ◽  
...  
Keyword(s):  
Space Charge ◽  
Charged Particles ◽  
High Current ◽  
Positive Space Charge ◽  
Positive Space

Numerical model of the anode region of high-current electric arcs

1997 ◽  
Vol 25 (5) ◽  
pp. 883-890 ◽  
Author(s):  
J. Jenista ◽  
V.R. Heberlein ◽  
E. Pfender
Keyword(s):  
Numerical Model ◽  
High Current ◽  
Anode Region ◽  
Electric Arcs

Study of energetic charged particles emitted from thin deuterated palladum foils subject to high current densities

1990 ◽  
Vol 9 (2) ◽  
pp. 195-197 ◽  
Author(s):  
F. E. Cecil ◽  
D. Ferg ◽  
T. E. Furtak ◽  
C. Mader ◽  
J. A. McNeil ◽  
...  
Keyword(s):  
Charged Particles ◽  
High Current ◽  
Current Densities

Positive-Space-Charge Lens for Focusing and Manipulating High-Current Beams of Negatively Charged Particles

2011 ◽  
Vol 39 (6) ◽  
pp. 1408-1411 ◽  
Author(s):  
A M Dobrovolsky ◽  
S P Dunets ◽  
A N Evsyukov ◽  
A A Goncharov ◽  
V I Gushenets ◽  
...  
Keyword(s):  
Space Charge ◽  
Charged Particles ◽  
High Current ◽  
Positive Space Charge ◽  
Positive Space

The Jovian ring

1984 ◽  
Vol 75 ◽  
pp. 203-209
Author(s):  
Joseph A. Burns
Keyword(s):  
Equatorial Plane ◽  
Charged Particles ◽  
Dynamical Evolution ◽  
Main Band ◽  
Small Grains ◽  
Three Components

ABSTRACTLying in Jupiter's equatorial plane is a diaphanous ring having little substructure within its three components (main band, faint disk, and halo). Micron-sized grains account for much of the visible ring, but particles of centimeter sizes and larger must also be present to absorb charged particles. Since dynamical evolution times and survival life times are quite short (≲102-3yr) for small grains, the Jovian ring is being continually replenished; probably most of the visible ring is generated by micrometeoroids colliding into unseen parent bodies that reside in the main band.

Atomic orientation effects in proton stopping at low velocity

1983 ◽  
Vol 41 ◽  
pp. 708-709
Author(s):  
Kin Lam
Keyword(s):  
Polycrystalline Material ◽  
Charged Particles ◽  
Target Material ◽  
Stopping Power ◽  
Low Velocity ◽  
Electronic Density ◽  
Interatomic Distances ◽  
Frame Work ◽  
Image Position ◽  
Atomic Orientation

The energy of moving ions in solid is dependent on the electronic density as well as the atomic structural properties of the target material. These factors contribute to the observable effects in polycrystalline material using the scanning ion microscope. Here we outline a method to investigate the dependence of low velocity proton stopping on interatomic distances and orientations.The interaction of charged particles with atoms in the frame work of the Fermi gas model was proposed by Lindhard. For a system of atoms, the electronic Lindhard stopping power can be generalized to the formwhere the stopping power function is defined as

Spatial resolution of X-ray microanalysis in thin foils

1978 ◽  
Vol 36 (1) ◽  
pp. 544-545
Author(s):  
R. Hutchings ◽  
I.P. Jones ◽  
M.H. Loretto ◽  
R.E. Smallman
Keyword(s):  
Spatial Resolution ◽  
Electron Probe ◽  
Beam Divergence ◽  
Inelastic Interaction ◽  
Specimen Thickness ◽  
High Current ◽  
Beam Spreading ◽  
X Ray ◽  
Thin Foils ◽  
Complex Calculation

There is increasing interest in X-ray microanalysis of thin specimens and the present paper attempts to define some of the factors which govern the spatial resolution of this type of microanalysis. One of these factors is the spreading of the electron probe as it is transmitted through the specimen. There will always be some beam-spreading with small electron probes, because of the inevitable beam divergence associated with small, high current probes; a lower limit to the spatial resolution is thus 2αst where 2αs is the beam divergence and t the specimen thickness.In addition there will of course be beam spreading caused by elastic and inelastic interaction between the electron beam and the specimen. The angle through which electrons are scattered by the various scattering processes can vary from zero to 180° and it is clearly a very complex calculation to determine the effective size of the beam as it propagates through the specimen.

Precipitation in silicon: Microanalysis

1988 ◽  
Vol 46 ◽  
pp. 474-475
Author(s):  
R.W. Carpenter
Keyword(s):  
Transition Metals ◽  
Spatial Resolution ◽  
Thin Foil ◽  
Precipitation Reaction ◽  
High Current ◽  
Reaction Products ◽  
Carbon And Nitrogen ◽  
Dielectric Layers ◽  
Precipitation Processes ◽  
Areas Of Interest

Interest in precipitation processes in silicon appears to be centered on transition metals (for intrinsic and extrinsic gettering), and oxygen and carbon in thermally aged materials, and on oxygen, carbon, and nitrogen in ion implanted materials to form buried dielectric layers. A steadily increasing number of applications of microanalysis to these problems are appearing. but still far less than the number of imaging/diffraction investigations. Microanalysis applications appear to be paced by instrumentation development. The precipitation reaction products are small and the presence of carbon is often an important consideration. Small high current probes are important and cryogenic specimen holders are required for consistent suppression of contamination buildup on specimen areas of interest. Focussed probes useful for microanalysis should be in the range of 0.1 to 1nA, and estimates of spatial resolution to be expected for thin foil specimens can be made from the curves shown in Fig. 1.

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