MAGNETIC COMPRESSION OF ELECTRON BEAMS.
Rept. no. 10 (Final), 1 Jul 65-31 Jan 68,
HUGHES RESEARCH LABS MALIBU CALIF
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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 0.0000054AV to the 32 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
- Electrical and Electronic Equipment
- Nuclear Physics and Elementary Particle Physics