Accession Number:

AD0271888

Title:

SPACE CHARGE WAVES IN AN ELECTRON BEAM OF GAUSSIAN CROSS SECTION AND THE INTEGRAL EQUATION OF TRAVELING WAVE TUBES WITH ELECTRON BEAMS/OF ARBITRARY CROSS SECTION

Descriptive Note:

Corporate Author:

CHALMERS UNIV OF TECHNOLOGY GOTEBORG (SWEDEN)

Personal Author(s):

Report Date:

1960-12-01

Pagination or Media Count:

1.0

Abstract:

For reference only at each of the ASTIA offices. This report cannot be satisfactorily reproduced ASTIA does not furnish copi s. DESCRIPTORS Phonons, Electrons, Metals, Lead, Sodium. Identifiers Fermi surface. Some semi- uantitative estimates of the actual magnitude of image effects are presented. The phonon spectrum, including image ffects, is calculated using a model of ions immersed in and screened by a uniform electron gas. The magnitude of the calculated image effects of the ord r of a few percent is comparable to those observed in lead. This model is refined to take into account the Bloch character of the electron wave functions. U ing assumptions believed to be valid for certain metals, including sodium and aluminum, it is found that this refinement reduces the image effects by a remarkably large factor, of order 0.01. A SECOND, BUT CLOSELY RELATED, IMAGE EFFECT IS DISCUSSED. A phonon can decay with the generation of an electron-hole pair. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE