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Velocity ratio measurement diagnostics and simulations of a relativistic electron beam in an axis encircling gyrotron

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9 Author(s)
Jaynes, R.L. ; Dept. of Nucl. Eng. & Radiol. Sci., Michigan Univ., Ann Arbor, MI, USA ; Gilgenbach, R.M. ; Hochman, J.M. ; Eidietis, N.
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This paper reports on diagnostic experiments and simulations of a large-orbit, axis-encircling gyrotron. The electron's perpendicular to parallel velocity ratio α is measured. The experimental diagnostic consists of an apertured portion of the beam which is passed through a cusped magnetic field then collected on a glass plate. The cross section of the beam is recorded on the glass plate in a radiation darkened pattern. From the gyro-radius, B-field, and beam energy, α can be calculated. Particle distributions of the radiation darkened plate are in excellent agreement with numerical simulations of single particle orbits derived from the relativistic equations of motion. The experimental measurement of α yields values from 0.9 to 1.4. The simulations predict an α of 1.0 to 1.5

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Plasma Science, IEEE Transactions on  (Volume:27 ,  Issue: 1 )