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 (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

A precise energy control system has been constructed for the U.B.C. electrostatic accelerator. Over the past six months it has provided analyzed beams of protons as large as 4½ microamperes on a target with an energy homogeneity of 0.1%. In the system adopted, the accelerated positive ions are analyzed by a 90° deflection magnet provided with entrance and exit slits to define the beam path. The magnetic field is stabilized to a few parts in 100,000, and controlled by a nuclear magnetic resonance method. A fraction of the emergent beam falls on two insulated slits, "sniffers", connected to a differential amplifier, the output of which varies as the beam impinges more on one than the other. Thus an error signal is obtained according to the shift in energy and hence position of the beam, which is used to modulate a reverse beam of electrons sent up the differential pumping tube of the generator. This beam loads the generator so as to maintain its voltage, and hence the energy of the ions, constant. The main central part of the beam passes through the slits onto the target mounted beyond. One-dial control over a range of 20 KeV is achieved by simply tuning the oscillator controlling the frequency of the nuclear magnetic resonance fluxmeter head. The energy of the ions can be varied in steps as fine as 0.2 KeV in 1,000 KeV. The generator's voltage scale (the generating volt-meter) and energy scale (the magnetic field of the analyzing magnet) have been calibrated relative to the currently accepted standard value of Herb, Snowdon, and Sala of 0.8735 MeV for the strong F¹⁹(p, α ɤ )O¹⁶ resonance and checked with the 0.3404 MeV resonance occurring in the same reaction. Additional calibration points were obtained using mass 2 and 3 beams. The complete gamma ray excitation curve for the reactions from F¹⁹ bombarded with protons has been taken up to 2 MeV and new resonances found at 1.62 and 1.84 MeV. The 1.355, 1.381 MeV doublet was resolved with a peak to trough value of 9/1 which is excellent confirmation of the homogeneity of the proton beam. The resonances in the N¹⁵¹⁹(p, α ɤ )C¹² reaction have also been investigated and background yields from various target backing materials measured up to 2 MeV. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

No description available.

Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references (leaves 97-103). Available also in a digital version from Dissertation Abstracts.