EFFECTS OF THERMAL VELOCITIES IN MAGNETICALLY FOCUSED ELECTRON BEAMS

Technical Report · Sat Apr 01 04:00:00 EST 1961

OSTI ID:4841567

Palmer, J L

Models for representing an axially symmetric, magnetically focused electron beam, such as the laminar model, the optical model, and the ballistic model, are analyzed mathematically and the computed behavior of each is compared with experimental observations of real electron beams. The over-all behavior of the laminar model agrees to some extent with the behavior of real electron beams; however, the motion of individual electrons or groups of electrons is not at all well predicted by the laminar model. The optical model describes with good accuracy the motion of individual electrons or groups of electrons, as well as the over-all behavior of real beams. The spreading of a beam by thermal velocities and the appearance of images in the current density st periodic intervals along a beam, phenomena that are observed experimentally, are predicted accurately by the optical model. Simple forms of lens aberrations are also treated with the aid of the optical model. (auth)

• Research Organization: California. Univ., Berkeley
• NSA Number: NSA-16-018147
• OSTI ID: 4841567
• Report Number(s): ASD-TR-61-125; AD-267039
• Country of Publication: United States
• Language: English

Related Subjects

CONFIGURATION
CURRENTS
DENSITY
ELECTRON BEAMS
ELECTRONS
IMAGES
LENSES
MAGNETIC FIELDS
MATHEMATICS
MOTION
NUCLEAR MODELS
NUMERICALS
OPTICAL MODEL
OPTICAL SYSTEMS
PHYSICS
SYMMETRY
TEMPERATURE
VELOCITY