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Relativistic Electron Beam Propagation In The Ion Focusing Regime
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Book Synopsis Relativistic Electron Beam Propagation in the Ion Focusing Regime by : J. R. Smith
Download or read book Relativistic Electron Beam Propagation in the Ion Focusing Regime written by J. R. Smith and published by . This book was released on 1986 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents observations on propagation of a mildly relativistic electron beam (gamma = 2.4) in several different gases (air, Helium, Nitrogen, Argon) at low pressure (10-320 mTorr). At such low pressures, and with beam currents of several kiloamperes, beam induced ionization may result in self focusing of an electron beam. Beams propagating under this condition are said to be in the ion focusing regime of propagation. The injected beam has an rms radius of 0.7 cm and a transverse temperature of 35 keV. Beam transport efficiency was measured for He, N2 and Ar. A simple calculation was performed to determine the space charge neutralization fraction as a function of time. Using the results of this calculation, the charge transport efficiency is found and compared with the experimentally measured quantity. Keywords: Electron Beam; Ion Focused Regime.
Book Synopsis Self Focusing of Relativistic Electron Bunches in Plasma by : Valery B. Krasovitskii
Download or read book Self Focusing of Relativistic Electron Bunches in Plasma written by Valery B. Krasovitskii and published by Nova Publishers. This book was released on 2008 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the non-linear theory of electrostatic focusing of an electron beam split into bunches under conditions when the plasma permittivity at the modulation frequency is negative and the effective Coulomb force acting on the electron bunches is reversed. Conditions for the spatial equilibrium between the bunch and plasma emission, as well as the dynamics of the formation of focussed bunches, are confirmed by solving (both analytically and numerically) the self-consistent set of equations.
Book Synopsis Study of Intense Relativistic Electron Beam Modulation by Wakefield Effects by :
Download or read book Study of Intense Relativistic Electron Beam Modulation by Wakefield Effects written by and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study has been undertaken in order to investigate plasma wakefield effects produced in intense electron beam propagation in a background plasma. A 2 MeV, 1 kA, electron beam is used for this experiment. A 50 cm diam., 3.6 m long drift tube is filled with a background gas, typically trimethylamine (TMA). This gas is ionized by electrons emitted from heated tungsten filaments which are biased at approximately -100 Volts. The resultant plasma density is fairly uniform and is adjustable in the range 10 to the 8th power to 5 x 10 to the 9th power per cubic cm. A higher density Ion Focused Regime (IFR) channel for electron beam propagation is generated by KrF-laser (248 nm) ionization of the background TMA gas. The intense electron beam propagating on an IFR channel in this background plasma experiences wakefield effects due to the natural oscillations of the background plasma which are excited by the beam current risetime. The Ez component of the induced field is responsible for producing beam current modulation near the background plasma frequency. The results scale with plasma density as expected and current modulation is nearly complete for a certain parameter range. This technique may be amenable to a high power microwave generation technique analogous to the relativistic klystron. Detailed experimental results of beam modulation will be presented.
Book Synopsis Electron Beam Propagation in the Ion Focused Regime (IFR) with the Experimental Test Accelerator (ETA). by :
Download or read book Electron Beam Propagation in the Ion Focused Regime (IFR) with the Experimental Test Accelerator (ETA). written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The IFR is a well-known stable, low pressure (0.10 to 0.120 torr in air) propagation window. Secondary electrons created by collisions of beam electrons with gas atoms are rapidly expelled by the strong radial electric field of the beam charge. The ions that remain inside the beam partially neutralize the electric field, allowing magnetic pinch forces to focus the beam. Experiments with the ETA beam have re-verified this stable window and are reported. Image forces from a close wall IFR propagation tank are also experimentally shown to center the beam and damp transverse oscillations. Results of experiments using 5 and 15 cm dia beam tubes are reported. For p tau> 2 torr-nsec (gas pressure x time into pulse the beam charge becomes completely neutralized by the ions, allowing a build up of plasma and resultant beam-plasma instabilities. The onset of these instabilities has been measured using rf pickup loops (0 to 2 GHz) and microwave detectors (6 to 40 GHz), and are also reported.
Book Synopsis THE THEORY AND SIMULATION OF RELATIVISTIC ELECTRON BEAM TRANSPORT IN THE ION-FOCUSED REGIME. by : STEPHEN BRIAN SWANEKAMP
Download or read book THE THEORY AND SIMULATION OF RELATIVISTIC ELECTRON BEAM TRANSPORT IN THE ION-FOCUSED REGIME. written by STEPHEN BRIAN SWANEKAMP and published by . This book was released on 1990 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: and provides a new and interesting view of IFR beam transport.
Book Synopsis Transverse Oscillations Observed in IFR (Ion Focused Regime) Electron Beam Propagation by : R. F. Schneider
Download or read book Transverse Oscillations Observed in IFR (Ion Focused Regime) Electron Beam Propagation written by R. F. Schneider and published by . This book was released on 1986 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Charge neutralized electron beam propagation in ionized gases has been studied recently at several laboratories. Such propagation in which the background plasma ions serve to neutralize the charge of tghe beam electrons is said to be the ion focused regime (IFR). There are currently several methods employed to create the background plasma channel through which the beam will propagate. The first is a beam induced plasma channel, the second is a low energy electron beam excited plasma, and the third is a laser initiated plasma channel. With the second and third methods, a pre-ionized channel is provided so that the beam space charge field will eject the plasma electrons leaving the positive ion channel. With the first method, the beam electrons leaving the positive ion channel. With the first method, the beam electrons themselves ionize the gas along the channel, so that much of the beam front is scattered by the higher pressure gas required leaving only a fraction of the pulse length to propagate. Of these methods, only the first, a beam induced plasma channel, is utilized in this work. A parallel reference gives much of the background for this work, and a subsequent paper will discuss results with a low energy electron beam excited channel.
Book Synopsis Soviet Research on the Transport of Intense Relativistic Electron Beams Through High-pressure Air by : Nikita Wells
Download or read book Soviet Research on the Transport of Intense Relativistic Electron Beams Through High-pressure Air written by Nikita Wells and published by . This book was released on 1987 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soviet research on the propagation of intense relativistic electron beams (IREB) through fairly high-pressure air (pressure range 0.1 to 760 Torr) since the early 1970s has included the study of the plasma channel created by the passage of the electron beam through air, the resistive hose instability and its effect on beam propagation, the effect of self-fields, current enhancement, gas expansion, return currents, inherent beam energy spread, and other factors. This report covers Soviet developments in IREB propagation through air where the beam is not focused by external magnetic fields. The information was obtained from Soviet open-source publications with emphasis given to the last ten years of beam propagation in the Soviet Union. The volume of papers published on this subject in recent years indicates a significant increase in Soviet research in this area.
Book Synopsis Relativistic Fluid Formulation and Theory of Intense Relativistic Electron Beams by :
Download or read book Relativistic Fluid Formulation and Theory of Intense Relativistic Electron Beams written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new general relativistic fluid formulation has been obtained for intense relativistic electron beams (IREB) with arbitrarily high relativistic mass factor ..gamma ... This theory is valid for confined IREB equilibria such as those found inside high energy accelerators as well as in the pinched and ion-focused regimes of beam propagation in plasma channels. The new relativistic fluid formulation is based on the covariant relativistic fluid formulation of Newcomb with the parameter lambda identical to 1, in order to allow for realistic confined equilibria. The resulting equilibrium constraints require that the beam has a slow rotational velocity around its direction of propagation and that the off-diagonal thermal stress element, associated with these two directions of motion, be nonzero. The effective betatron oscillation frequency of the fluid elements of the beam is modified by the radial gradient and anisotropies in the thermal stress elements of the beam fluid. The wave equation, for sausage, hose and filamentation excitations on the relativistic fluid beam, is found to be formally identical to that obtained from the Vlasov equation approach, hence phase-mixing damping is a generic and self-consistent correlate of the new relativistic fluid formulation.
Book Synopsis Experimental Study of the Propagation and Focusing of an Intense Relativistic Electron Beam by : Patrick Gerard O'Shea
Download or read book Experimental Study of the Propagation and Focusing of an Intense Relativistic Electron Beam written by Patrick Gerard O'Shea and published by . This book was released on 1986 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies of High Current Relativistic Electron Beam Propagation by : David Andrew Hammer
Download or read book Studies of High Current Relativistic Electron Beam Propagation written by David Andrew Hammer and published by . This book was released on 1969 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Collective Ion Acceleration and Relativistic Electron Beam Propagation by : John Rudolph Smith
Download or read book An Experimental Study of Collective Ion Acceleration and Relativistic Electron Beam Propagation written by John Rudolph Smith and published by . This book was released on 1983 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Frontiers in High Energy Density Physics by : National Research Council
Download or read book Frontiers in High Energy Density Physics written by National Research Council and published by National Academies Press. This book was released on 2003-05-11 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent scientific and technical advances have made it possible to create matter in the laboratory under conditions relevant to astrophysical systems such as supernovae and black holes. These advances will also benefit inertial confinement fusion research and the nation's nuclear weapon's program. The report describes the major research facilities on which such high energy density conditions can be achieved and lists a number of key scientific questions about high energy density physics that can be addressed by this research. Several recommendations are presented that would facilitate the development of a comprehensive strategy for realizing these research opportunities.
Book Synopsis TRANSPORT OF LONG-PULSE RELATIVISTIC ELECTRON BEAMS IN PREFORMED PLASMA CHANNELS IN THE ION FOCUS REGIME. by : JOEL DAVID MILLER
Download or read book TRANSPORT OF LONG-PULSE RELATIVISTIC ELECTRON BEAMS IN PREFORMED PLASMA CHANNELS IN THE ION FOCUS REGIME. written by JOEL DAVID MILLER and published by . This book was released on 1989 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: unity.
Book Synopsis Soviet Research on the Transport of Intense Relativistic Electron Beams Through Low-pressure Air by : Nikita Wells
Download or read book Soviet Research on the Transport of Intense Relativistic Electron Beams Through Low-pressure Air written by Nikita Wells and published by . This book was released on 1986 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report analyzes Soviet research on the transport of intense relativistic electron beams (IREB) through low-pressure air and other gases without external magnetic fields. It reviews research reported in open-source technical publications from seven Soviet research institutes. These research papers indicate that Soviet interest in long-distance IREB transport at low gas pressure has endured from 1979 to the present.
Book Synopsis Theoretical Studies of Intense Relativistic Electron Beam-plasma Interactions by : Sidney Darwin Putnam
Download or read book Theoretical Studies of Intense Relativistic Electron Beam-plasma Interactions written by Sidney Darwin Putnam and published by . This book was released on 1972 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Propagation of High Intensity, Relativistic Electron Beams by : Thomas G. Roberts
Download or read book On the Propagation of High Intensity, Relativistic Electron Beams written by Thomas G. Roberts and published by . This book was released on 1970 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intense beams of relativistic electrons have been extracted from the electrode space of flash X-ray machines and projected into plasma columns and drift spaces. In the plasma columns the beam pinches itself and propagates to a target at the end of the discharge. The plasma column is produced by a conventional pinch discharge in argon and the magnetic field of the plasma column is sufficient to guide the high energy beam around rather sharp curves with little loss of energy. In addition to the very interesting properties of the beam itself, and its applications in thermonuclear work, the possibility of using these beams for a relatively inexpensive, ion accelerator which may produce intense pulses of heavy ions with energies as high as 10 to the 12th power eV per nucleon has recently stimulated research. It is the purpose of the paper to describe the principal experimental results so far obtained, and to derive an expression for the maximum current which a beam may possess by use of the Bennett theory and the equilibrium current distribution which the beam must assume. It will also be shown that this expression reduces to the Alfven limit in a frame in which the beam's space charge is fully neutralized, and indicates that beams which exceed the Alfven limit may be expected to propagate in the laboratory frame. (Author).
Book Synopsis A Study of Combination, Neutralization, and Pinch Mode Propagation of an Intense, Relativistic Electron Beam by : Walter Louis Gardner
Download or read book A Study of Combination, Neutralization, and Pinch Mode Propagation of an Intense, Relativistic Electron Beam written by Walter Louis Gardner and published by . This book was released on 1973 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
