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Theoretical studies of plasma acceleration by an rf field gradient indicated that a plasma will be accelerated toward the low-field region if the applied frequency is greater than the critical frequency of the plasma, and toward the high-field region if the frequency is less than the critical frequency. Calculations for the acceleration of plasma spheres and ellipsoids of arbitrary orientation with respect to the rf field have been completed. Experiments with plasmas of various densities have demonstrated both the acceleration and deceleration of the plasmas as predicted by theory. Mercury plasma has been accelerated with a 140-Mc rf field gradient to a velocity of 25 x 100,000 cm/sec, equivalent to a specific impulse of 2500 seconds. (Author).
This thesis focuses on a cutting-edge area of research, which is aligned with CERN's mainstream research, the "AWAKE" project, dedicated to proving the capability of accelerating particles to the energy frontier by the high energy proton beam. The author participated in this project and has advanced the plasma wakefield theory and modelling significantly, especially concerning future plasma acceleration based collider design. The thesis addresses electron beam acceleration to high energy whilst preserving its high quality driven by a single short proton bunch in hollow plasma. It also demonstrates stable deceleration of multiple proton bunches in a nonlinear regime with strong resonant wakefield excitation in hollow plasma, and generation of high energy and high quality electron or positron bunches. Further work includes the assessment of transverse instabilities induced by misaligned beams in hollow plasma and enhancement of the wakefield amplitude driven by a self-modulated long proton bunch with a tapered plasma. This work has major potential to impact the next generation of linear colliders and also in the long-term may help develop compact accelerators for use in industrial and medical facilities.

AFOSR.

United States. Air Force. Office of Scientific Research

Published: 1960

Total Pages: 940


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