STUDY OF ELECTRON FOCUSING BY NON-LINEAR SPIRALS.
Final rept. Jun 59-Oct 61,
GENERAL ELECTRIC CO SCHENECTADY N Y
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The use of resistive spiral coatings in electron optical devices is discussed. These include spirals with uniform, as well as non-uniform, turn density. The linear spirals control electron optical throw without focusing. Non-linear spirals can be used as electron lenses of the coverging, as well as diverging type. A general theory called electron trigonometry is developed to predict image formation in systems with spiral optics. This theory is also applicable to conventional systems employing electrostatic, magnetic, or mixed fields. Practical applications of spiral optics are illustrated by four types of developmental cathode ray tubes, including scan stabilizer tube, conserving sweep size over a wide range of post acceleration penetron tube, using spiral optics for a single beam two color display scan magnifier, using a spiral lens to increase picture size up to three times linear and microspot tube, using a spiral neck to produce 3,000 lines per inch at 40KW per sq. cm. Author