Author: R.N. FranklinPublisher:
ISBN: 9780853110859
Category : Plasma (Ionized gases)
Languages : en
Pages : 6
Book Description
Stability of the Plasma Sheath
Author: R.N. FranklinPublisher:
ISBN: 9780853110859
Category : Plasma (Ionized gases)
Languages : en
Pages : 6
Book Description
The Stability of the Plasma Sheath with Secondary Emission
Author: W. E. HanPlasma Stability and the Bohr-Van Leeuwen Theorem
Author: J. Reece RothPublisher:
ISBN:
Category : Plasma confinement
Languages : en
Pages : 60
Book Description
A Note on the Stability of a Current-carrying Plasma
Author: Ira B. BernsteinThe Stability of the Dense Plasma Focus
Author: Joseph W. MatherPublisher:
ISBN:
Category : Electrons
Languages : en
Pages : 16
Book Description
The influence of small dc 'axial' magnetic fields upon the stability of a focused plasma column is shown by use of soft x rays. Material damage to the center electrode and the intense x-ray emission at the electrode face resulting from electron bombardment are considerably reduced. Although the final heating of the ions and electrons is inhibited as expected owing to a trapped magnetic field, the spatial stability of the focused column offers greater possibility for scaling to higher energies.
Plasma Sheath Processes
Author: William H Long (Jr)Publisher:
ISBN:
Category :
Languages : en
Pages : 123
Book Description
A model of the plasma sheath in high pressure ionized gas flows is presented. Nonequilibrium electron energy distributions are determined from a numerical solution of the collisional Boltzmann equation in the presence of strong field and density gradients. Self-consistent coupling to the electric field, ion kinetics and gas dynamics is included. In subsonic flows, the sheath and the boundary layer can be treated independently. A stability analysis indicates two forms of thermal instability occur in the cathode sheath at high pressures. (Author).
Plasma-Sheath Instability in Hall Thrusters Due to Periodic Modulation of the Energy of Secondary Electrons in Cyclotron Motion
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 579
Book Description
Particle-in-cell simulation of Hall thruster plasmas reveals a plasma-sheath instability manifesting itself as a rearrangement of the plasma sheath near the thruster channel walls accompanied by a sudden change of many discharge parameters. The instability develops when the sheath current as a function of the sheath voltage is in the negative conductivity regime. The major part of the sheath current is produced by beams of secondary electrons counter-streaming between the walls. The negative conductivity is the result of nonlinear dependence of beam-induced secondary electron emission on the plasma potential. The intensity of such emission is defined by the beam energy. The energy of the beam in crossed axial electric and radial magnetic fields is a quasi-periodical function of the phase of cyclotron rotation, which depends on the radial profile of the potential and the thruster channel width. There is a discrete set of stability intervals determined by the final phase of the cyclotron rotation of secondary electrons. As a result, a small variation of the thruster channel width may result in abrupt changes of plasma parameters if the plasma state jumps from one stability interval to another.
Scientific and Technical Aerospace Reports
Author: Fundamentals of Electric Propulsion
Author: Dan M. GoebelPublisher: John Wiley & Sons
ISBN: 0470436263
Category : Technology & Engineering
Languages : en
Pages : 528
Book Description
Throughout most of the twentieth century, electric propulsion was considered the technology of the future. Now, the future has arrived. This important new book explains the fundamentals of electric propulsion for spacecraft and describes in detail the physics and characteristics of the two major electric thrusters in use today, ion and Hall thrusters. The authors provide an introduction to plasma physics in order to allow readers to understand the models and derivations used in determining electric thruster performance. They then go on to present detailed explanations of: Thruster principles Ion thruster plasma generators and accelerator grids Hollow cathodes Hall thrusters Ion and Hall thruster plumes Flight ion and Hall thrusters Based largely on research and development performed at the Jet Propulsion Laboratory (JPL) and complemented with scores of tables, figures, homework problems, and references, Fundamentals of Electric Propulsion: Ion and Hall Thrusters is an indispensable textbook for advanced undergraduate and graduate students who are preparing to enter the aerospace industry. It also serves as an equally valuable resource for professional engineers already at work in the field.
Author: