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Title:Ion Bunching at High Energies
Author(s):Johnson, Gary Burton
Department / Program:Electrical Engineering
Discipline:Electrical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Fluid and Plasma
Abstract:Light ions offer several advantages over an electron beam or lasers as the driver for pellet fusion. This research deals with demonstrating that the electrostatic space charge fields produced by a reflex triode can be used to extract, accelerate, focus and bunch ions onto a target. The source of ions used in this experiment was a preformed plasma produced by a hollow cathode discharge.
A Nereus e-beam accelerator, on loan from Sandia Laboratories, is used to drive the reflex triode. This produces a 35 ns electron beam pulse of 300 kV and 50 kA. One can show that an electrostatic space charge well will be set up on the far side of the transparent anode. Ions in this region will be accelerated downstream and due to the distribution in their velocities, a bunching of their arrival times at a point downstream will occur.
Negatively biased Faraday cup probes are used to measure the intensity, pulse width, and time-of-flight of the ion beam downstream. Time-of-flight data indicate that the ions are being accelerated to > 90% of the applied anode potential. Ion beam current densities of up to 160 A/cm('2) have been obtained yielding electron beam to ion beam conversion efficiencies of > 25%, and bunching factors of greater than four have been observed.
This research demonstrates the feasibility of using efficient electron beam machines to produce intense high energy ion beams. Possible applications include using the device as the driver for pellet fusion.
Issue Date:1980
Description:89 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1980.
Other Identifier(s):(UMI)AAI8026531
Date Available in IDEALS:2014-12-12
Date Deposited:1980

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