Open AccessA water-filled radio frequency accelerating cavity
Author(s) -
R. J. Faehl,
R.K. Keinigs,
E.W. Pogue
Publication year - 1998
Language(s) - English
Resource type - Reports
DOI - 10.2172/563849
Subject(s) - physics , particle in cell , dielectric , particle (ecology) , power (physics) , particle accelerator , cavity wall , electromagnetic field , current (fluid) , resonant cavity , field (mathematics) , distortion (music) , computational physics , microwave cavity , plasma , atomic physics , optics , materials science , microwave , optoelectronics , nuclear physics , beam (structure) , amplifier , laser , quantum mechanics , pure mathematics , composite material , thermodynamics , geology , oceanography , mathematics , cmos
This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The objective of this project was to study water-filled resonant cavities as a high-energy density source to drive high-current accelerator configurations. Basic considerations lead to the expectation that a dielectric-filled cavity should be able to store up to e/e{sub o} as much energy as a vacuum one with the same dimensions and thus be capable of accelerating a proportionately larger amount of charge before cavity depletion occurs. During this project, we confirmed that water-filled cavities with e/e{sub o} = 60-80 did indeed behave with the expected characteristics, in terms of resonant TM modes and cavity Q. We accomplished this result with numerical cavity eigenvalue codes; fully electromagnetic, two-dimensional, particle-in-cell codes; and, most significantly, with scaled experiments performed in water-filled aluminum cavities. The low-power experiments showed excellent agreement with the numerical results. Simulations of the high-field, high-current mode of operation indicated that charged-particle loss on the dielectric windows, which separate the cavity from the beamline, must be carefully controlled to avoid significant distortion of the axial fields