# Accession Number:

## AD0619888

# Title:

## RADIATION BY A UNIFORMLY ROTATING LINE CHARGE IN A PLASMA

# Descriptive Note:

## Interim rept.

# Corporate Author:

## POLYTECHNIC INST OF BROOKLYN NY DEPT OF AEROSPACE ENGINEERING AND APPLIED MECHANICS

# Personal Author(s):

# Report Date:

## 1965-06-01

# Pagination or Media Count:

## 77.0

# Abstract:

A theoretical investigation is conducted for the radiation produced by a linear distribution of electric charge executing circular motion both inside and outside a cylindrical plasma column. The analysis includes the effects of compressibility and anisotropy of the plasma upon the radiation characteristics of the charge distribution. In the incompressible isotropic case, a dipole resonance phenomenon is exhibited for the first harmonic of the angular frequency of rotation of the charge when the charge moves at non- relativistic velocities. If the chargemoves at extremely small velocities, the resonance becomes a singularity. The influence of compressibility upon these radiation characteristics is discussed and is shown to be negligible. In the case of the presence of a magnetic field, i.e. for an anisotropic plasma, the dipole resonance is shifted. Moreover, a multipole resonance is possible for a sufficiently higher order harmonic. Furthermore, in a frequency range just above this multipole resonance, Cerenkov radiation contributes to the existent Bremsstahlung radiation for a single harmonic in the neighborhood of the singularity of the index of refraction. Thereafter, the radiation contributions of the remaining harmonics is negligible.

# Descriptors:

- *RADIATION
- ANISOTROPY
- BREMSSTRAHLUNG
- CERENKOV RADIATION
- CIRCULAR
- COMPRESSIVE PROPERTIES
- CYCLOTRON RESONANCE
- CYLINDRICAL BODIES
- DIPOLES
- DISTRIBUTION
- EXPLOSIVE CHARGES
- FLUID MECHANICS
- FREQUENCY
- HARMONICS
- INCOMPRESSIBILITY
- ISOTROPISM
- MAGNETIC FIELDS
- MAGNETOHYDRODYNAMICS
- MOTION
- MULTIPOLARITY
- OSCILLATION
- PLASMAS(PHYSICS)
- RESONANCE
- ROTATION
- THEORY
- VELOCITY
- WAVE PROPAGATION

# Subject Categories:

- Plasma Physics and Magnetohydrodynamics