This thesis describes the design and construction of a linear accelerator, specifically, a positive-ion source, a high voltage supply, an accelerating column, and the necessary associated vacuum system.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1963. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 104-106).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1959. / Typescript. Abstracted in Dissertation abstracts, v. 19 (1959) no. 9, p. 2374-2375. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 264-268).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1940. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 31).

Thesis (M.S.)--University of Wisconsin--Madison, 1968. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1962. / Vita. Includes computer source code. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [136-138]).

Thesis (Ph. D. in Physics)--University of California, Berkeley, Sept. 1960. / TID-4500 (15th ed.). Includes bibliographical references (p. 138).

The pre-accelerator and the dielectric loaded slow-wave structure are examined in detail. The fields in the pre-accelerator are expressed as an infinite series which converges rapidly. It was found that by considering only the first term of the series, good results were obtained for the stored energy, the power dissipated and the cavity Q. Low power tests on the pre-accelerator gave confirmation of theoretical calculations. The fields in the dielectric loaded slow-wave structure were determined experimentally by means of a perturbation method. The results compare favourably with previous theoretical work. An electron beam was introduced into the pre-accelerator cavity using a 2 KV electron gun and measurements were made of the gain in electron energy. Peak microwave power levels of up to 0.19 MW were used and electron energies up to 340 KEV were obtained. It was concluded that the pre-accelerator can provide adequate initial conditions for the capture of electrons in the main accelerator. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

In part I of this thesis the theory underlying electron beam design is presented. The paraxial ray equation is derived, and is used to determine the focal properties of an aperture and of an Einzel lens, both of which are assumed to be thin lenses. An aperture can exert a positive or a negative focusing action on an electron beam, depending on the potential gradients existing on either side of the aperture. In an Einzel lens the focusing action is always positive, whether the focusing anode potential is greater or smaller than the beam potential. If the focusing anode is made very negative w.r.t. the beam voltage the electrons are reflected. In the above space-charge and thermal velocity effects are ignored. It is well known that in practical guns electron interaction is important and the Pierce method of electron gun design is examined. The effect of thermal velocity on obtainable current density is also considered. In part II of this thesis the theory is applied to the design of an electron source for a resonant linear accelerator. The perveance and cross-over point are calculated for an existing, partly assembled, bombarded cathode, Pierce type, electron gun. Methods are considered for adapting this gun as a 2 kV. electron source for the resonant linear accelerator. Electrostatic focusing methods for this application are inefficient, as less than 5% of the beam current is utilised. If Brillouin type magnetic focusing is used, a current efficiency of up to 75% is possible. A tungsten filament electron gun, capable of producing a 10 ma beam at a gun voltage of 2 kV, is designed and constructed. This gun has a filamentary cathode consisting of seven turns of 0o013" tungsten wire wound on a threaded mandrel (#4-40). Four anodes are used; they are made of Copel, and perform the functions of current control and of focusing the electron beam. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate