The Bell System Technical Journal, 1939, Vol. 18: A Journal Devoted to the Scientific and Engineering Aspects of Electrical Communication (Classic Reprint) - Hardcover

King, R. W.

Hardcover

ISBN 10: 0265899613 ISBN 13: 9780265899618

Verlag: Forgotten Books, 2017

Inhaltsangabe

Excerpt from The Bell System Technical Journal, 1939, Vol. 18: A Journal Devoted to the Scientific and Engineering Aspects of Electrical Communication

Certain types of electrostatic fields may be used as lenses to focus electron beams. The theory of these lenses is developed for electric fields that are symmetrical about a central axis. The introduction of two velocity functions exactly reduces the partial differential equations of electron motion to a series of ordinary differential equations. The first equation describes the action of a lens for electron paths near the axis; the remaining equations determine the higher order aberration terms. Sections on the following subjects are included: the general equations of electron optics, thin lenses, thick lenses, aberration, the reduction of aberra ration, apertured plates, and concentric tubes. A list of symbols and lens equations is also included at the end of the article.

N certain types of modern vacuum tubes, a beam of electrons is brought to a focus by an electrostatic field whose action on the beam is ogous to that of an optical lens on a beam of light. An electrostatic field which acts in this manner is called an electron lens. Such lenses are rapidly finding applications in amplifier tubes, tele vision and oscillograph tubes, electron microscopes, and various types of experimental apparatus. As the extent of their application widens, the theory of these lenses naturally assumes a corresponding importance.

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Details zur Ausgabe

• Verlag: Forgotten Books
• Erscheinungsdatum: 2017
• Sprache: Englisch
• ISBN 10: 0265899613
• ISBN 13: 9780265899618
• Einband: Gebundene Ausgabe
• Anzahl der Seiten: 782
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