# Accession Number:

## AD0258539

# Title:

## THE POWER FLOW IN ELECTRON BEAMS AS SEEN BY A MOVING OBSERVER

# Descriptive Note:

# Corporate Author:

## CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB

# Personal Author(s):

# Report Date:

## 1960-12-01

# Pagination or Media Count:

## 1.0

# Abstract:

IT IS HELPFUL FOR THE UNDERSTANDING OF THE MECHANISM OF A WAVE PROPAGATION IN AN ELECTRON BEAM WITH CONSTANT DRIFT VELOCITY TO CONSIDER THE PROPAGATION FROM THE STANDPOINT OF AN OBSERVER MOVING WITH THE AVERAGE VELOCITY OF THE ELECTRONS. The power flow in an electron beam as seen by a moving observer depends upon the relative velocity between the electron and the observer. The dc kinetic power flow goes to zero as the observer approaches the velocity of the electrons. The ac power flow the sum of ac kinetic and electromagnetic power flow depends upon the relative motion of the observer to the electrons and upon the ratio of the observers velocity to the phase velocity of the wave propagation. It is shown that the ac power flow changes sign at points where the observer travels synchronously with the phase of the wave. Author