The stability analysis of a beam-plasma filled waveguide presented previously will be extended to include radial beam geometry effects and azimuthal magnetic self-field effects. Here, the dispersion equations cannot be solved analytically, therefore, the equations must be integrated numerically. Because boundary conditions are specified at both r=0 and r=Rw (i.e., at the conducting wall), this is a two-point boundary value problem and solutions are sought using a generalized shooting method. This shooting technique is described and then used to solve the fully electromagnetic linear dispersion equations, in order to investigate radial beam geometry effects and azimuthal magnetic self-field effects on the wave and stability properties of a bounded beam-plasma system immersed in an applied axial magnetic field.
Increased Landau damping of electrostatic waves in the presence of low density suprathermal electron populations is examined. An electrostatic dispersion analysis is compared directly with one-dimensional particle-in-cell simulations of the Landau damping rates. An analytic damping rate formula is presented that is in good agreement with numerical solutions of the dispersion equation over a range of parameters.
This report treats three areas of advance during the 1980 effort: (I) improvements to the 1-D strongly-coupled plasma implosion and radiation code SPLAT and results of radiative yield studies using the code; (II) development of formalism for solving the field penetration/skin-depth problem in an inhomogeneous, time-varying imploding conductor in a plasma-loaded diode; (III) circuit equation and scaling of hard radiation in the presence of fully developed sausage instability (beading) of the assembled plasma. In addition, a short section (Chapter V) is devoted to work in progress: high-accuracy matrix inversion techniques and interpolators for solving the generalized Hertz vector equations used in II above, and for following CRE equations and diffusive behavior in general; and, beginning plans for modifying 1-D MHD codes, making them compatible with the field-diffusion and corona programs and with CRE radiation packages.
The large total energy and power levels available in relativistic electron beams make them an attractive candidate for heating high density or large volume plasmas. If the plasma density is greater than a few times 10 to the 16th power/cc, then a significant fraction of the energy transferred to the plasma will be radiated in times of the order of 100 nsec. By choosing the atomic number and electron temperature of the plasma, most of this radiated energy can be soft X-rays. The problem posed by the beam-plasma radiator approach is whether the conditions for energy transfer, plasma containment, high density, and high plasma electron temperature (1 to 10 keV) can all be satisfied simultaneously. (GRA)
view Abstract Citations (17) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radiation from Relativistic Beams Interacting with Interstellar Gas Rose, W. K. ; Beall, J. H. ; Guillory, J. ; Kainer, S. Abstract Radiative processes resulting from the interaction between relativistic e(-) - e(+) and e(-) - p beams and interstellar gas are described. Calculations of the energy loss in relativistic e(-) - e(+) beams interacting with a cloud optically thin to continuum radiation but optically thick to line photons are first presented; then, collisionless versus inverse Compton losses for the e(-) - e(+) beam are compared. The effects of plasma turbulence on the number density of photons in the cloud are calculated, and it is suggested that as a consequence of plasma turbulence, significant high-energy tails will develop on the Maxwell-Boltzmann distribution of the ambient gas. The additional effects associated with e(-) p beams are calculated. These beams have greatly extended propagation lengths for similar energy loss mechanisms. Additional collisional processes are discussed which can result in significant direct energy loss by the beam protons. Publication: The Astrophysical Journal Pub Date: March 1987 DOI: 10.1086/165042 Bibcode: 1987ApJ...314...95R Keywords: Galactic Nuclei; Interstellar Gas; Interstellar Radiation; Particle Beams; Quasars; Relativistic Particles; Electron Beams; Galactic Radiation; Proton Beams; Astrophysics; GALAXIES: JETS; GALAXIES: NUCLEI; PARTICLE ACCELERATION; PLASMAS; QUASARS; RADIATION MECHANISMS full text sources ADS | data products SIMBAD (2) NED (1)
This document is prepared as a briefing aid and technical primer for persons unfamiliar and uninitiated with the theory of imploding plasma radiation sources. It is hoped that it will prove helpful in introducing the basic physics concepts of these sources and in presenting these concepts to newcomers and potential users.
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