Accession Number : AD0671643

Title :   MAGNETIC COMPRESSION OF ELECTRON BEAMS.

Descriptive Note : Rept. no. 10 (Final), 1 Jul 65-31 Jan 68,

Corporate Author : HUGHES RESEARCH LABS MALIBU CALIF

Personal Author(s) : Amboss,Kurt

Report Date : JUN 1968

Pagination or Media Count : 186

Abstract : The problem of compressing an electron beam by magnetic fields was investigated theoretically and experimentally. The feasibility of magnetic compression was established and demonstrated by passing a perveance 0.0000054A/V to the 3/2 power beam, compressed in area by a factor of 1000, through a drift tube 0.014 in. in diameter and 1 in. long, with 95% transmission. The success of the magnetic compression technique rests on the hitherto unsuspected ability of the beam to damp out undulations and smooth out structure. A quantitative explanation of the mechanism, which does not involve electron-electron collisions, is put forward. Three qualitative theories are discussed: (1) a simple semiempirical theory to be used in engineering calculation of the required confining field; (2) a more elaborate theory which is an extension of a statistical theory by Pierce and Walker and is valid for the downstream region where the beam has become featureless; and (3) a nonlinear electron optical theory which describes the electron flow close to the gun. (Author)

Descriptors :   (*ELECTRON BEAMS, MAGNETIC FIELDS), ELECTRON GUNS, COMPRESSIVE PROPERTIES, VELOCITY, THERMAL PROPERTIES, FOCUSING, THEORY

Subject Categories : Electrical and Electronic Equipment
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE