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Wednesday, July 8, 2020 | History

2 edition of **Plasma oscillations at microwave frequencies in a static magnetic field** found in the catalog.

Plasma oscillations at microwave frequencies in a static magnetic field

Donald John Nelson

- 140 Want to read
- 26 Currently reading

Published
**1954**
.

Written in English

- Oscillations.,
- Ionization of gases.

**Edition Notes**

Statement | by Donald John Nelson. |

The Physical Object | |
---|---|

Pagination | 228 leaves, bound : |

Number of Pages | 228 |

ID Numbers | |

Open Library | OL14313168M |

In plasma physics, waves in plasmas are an interconnected set of particles and fields which propagate in a periodically repeating fashion. A plasma is a quasineutral, electrically conductive the simplest case, it is composed of electrons and a single species of positive ions, but it may also contain multiple ion species including negative ions as well as neutral particles. Ions can be created in an inductively coupled plasma, which is a plasma source in which the energy is supplied by electrical currents which are produced by electromagnetic induction, that is, by time-varying magnetic fields.. Microwave-induced plasma. Microwave induced plasma ion sources are capable of exciting electrodeless gas discharges to create ions for trace element mass spectrometry.

The usual hydromagnetic equations are applied to a fully ionized two- fluid bounded plasma with uniform temperature in a magnetic bottle. The condition of equilibrium is shown to imply a gaussian distribution of plasma density, and internal magnetic and electric fields, with non-zero charge density throughout the plasma. 2. Using OOPIC, model a linear, cylindrical plasma device with a uniform magnetic field. Add two different oscillating electric fields to the static background magnetic field. Examine what happens when the difference in oscillating electric field frequencies is close to the particle gyrofrequency.

Using Static Magnetic Field Neha Mehra*, Rajesh K. Singh, oscillation is known as plasma frequency or plasma resonant frequency but due to their excessive mass as compared to electrons, the ion plasma frequency is much below the microwave range . The low frequency (f) satisfies a simple relation, (fci/f)2 + (fpi/f)2 = 1, which is known as the lower hybrid resonance. There is a threshold power for the microwave to excite the oscillations. It is expected that the lower hybrid mode in plasmas is coupled with the Bernstein mode at the upper hybrid resonance through a strong nonlinear process.

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Plasma oscillations at microwave frequencies in a static magnetic fieldCited by: 1. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link).

A theory of the small-amplitude oscillations of an ionized gas in a static magnetic field is developed, including the effects of temperature motions. The Boltzmann equation is solved for this problem, and exact expressions are obtained for the distribution function and dispersion relation. A general feature of the dispersion relation is the existence of gaps in the spectrum at frequencies Cited by: A plasma in a magnetic field is capable of many different kinds of oscillations.

The simplest of these are oscillations which propagate parallel or perpendicular to the magnetic field. In these two simple cases, in which the electric field is parallel to the magnetic field, the two modes of oscillation are uncoupled or : D.

Frank-Kamenetskii. Josephson plasma resonance has been studied in a wide microwave frequency range between 10 and 52 GHz in a magnetic field parallel to the ab-plane in underdoped Bi 2 Sr 2 CaCu 2 O 8+δ.

Above about 30 GHz two resonance modes were observed: one (LT mode) appears at low temperatures and another (HT mode) at higher temperatures, leaving a temperature gap between two Cited by: 7.

The concept of plasma oscillations was used to study whether or not a static magnetic field changes the dynamicsof the junction. THEORY The theoretical concept of the plasma resonance is based on the simple and widely used resistor- capacitor shunted junction (RCSJ) model.

frequency of oscillation. Thus we identify the frequency of electron plasma oscillations in (4) as 2 2 e pe pe oe en f m. (5) We will calculate the value of fpe pe 2 for a few cases of interest. Note that fpe depends only on the density of the electrons, all the other factors are constants.

(a) A typical laboratory plasma. 42 Chapter 3 v = E B B2 vE, () which is the “E cross B” drift this case, the drift is in the direction perpendicular to both E and B, and arises from the cycloidal electron motion in the magnetic field being accelerated in the direction of –E and decelerated in the direction of elongates the orbit on one-half cycle and shrinks the.

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A somewhat more surprising fact is that charged particles can also be confined by a rapidly oscillating, inhomogeneous electromagnetic wave-field. A large body of literature exists on the response of tissues to electromagnetic fields, primarily in the extremely-low-frequency (ELF) and microwave-frequency ranges.

In general, the reported effects of radiofrequency (RF) radiation on tissue and organ systems have been attributed to thermal interactions, although the existence of nonthermal effects at low field intensities is still a subject. The operation of the plasma resonance probe in the absence of a magnetic field is now well understood, and the resonant frequency can be interpreted to give the electron density in the plasma.

In many potential applications of this diagnostic technique to laboratory and space plasmas, a static magnetic field is present. This paper considers the resulting modifications to the resonance.

electric and magnetic fields, in the presence of collisions. At MW frequencies the EEDF is stationary, meaning that it cannot follow the oscillation of the EM field with time.

In the absence of a static magnetic field, one can then write the stationary and spatially homogeneous Boltnann equation as Influence of w on the Plasma Characteristics. Analysis of experiments has shown that in most cases the excitation of plasma waves by a microwave field was the result of a linear transformation near a surface on which the upper hybrid frequency was equal to the field frequency.

Problems encountered in microwave heating of a plasma in a hypothetical toroidal thermonuclear reactor are discussed. The growth rate of electrostatic instabilities of electron oscillation and low-frequency (LF) ion oscillation are investigated for a plasma produced by a circularly polarized microwave field during.

Abstract. It has been determined that the superconducting system, that consists of copper oxide based mercury oxide, behaves as if an oscillating cavity with the plasma frequency of 10 12 Hz under particular amount of magnetic field at space temperature of K.

Moreover, plasma frequency of superconducting system (mercury based superconductors) were found to be varying from infrared to. Plasma - Plasma - Plasma oscillations and parameters: Just as a lightweight cork in water will bob up and down about its rest position, any general displacement of light electrons as a group with respect to the positive ions in a plasma leads to the oscillation of the electrons as a whole about an equilibrium state.

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In presence of a static transverse magnetic field, in short wavelength limit plasma dispersion relation is found varied in accordance with the applied magnetic field.

Thus, the wave causes the particle to execute sympathetic simple harmonic oscillations, in the -direction, with an amplitude that is directly proportional to its charge, and inversely proportional to its mass.

Suppose that the wave is actually propagating through an unmagnetized electrically neutral plasma consisting of free electrons, of mass and charge, and free ions, of mass and charge. A well-studied microwave spin-motion coupling scheme uses a static magnetic field gradient in combination with one or more microwave fields.

One previous demonstration of this scheme uses a pair of microwave fields symmetrically detuned about the qubit frequency [ 15 ].and direction of the magnetic field is not near я/2, the resonant plasma oscillations will be strongly damped.

The damping coefficient is 3 У m — я;*m4 sin2w в (kc e /a) ce)2m-— l)-2tan20] kc G. (15) Plasma waves with frequencies in the interval тсосе — s m magnetic. is the cyclotron frequency from a perpendicularly applied static magnetic field, B 0 heterojunctions at microwave frequencies Plasma oscillations of .