A 500 MW, 1 μs pulse length, high current relativistic klystron

Fazio, M.V.; Haynes, W.B.; Carlsten, Bruce E.; Stringfield, R.

doi:10.1109/27.338290

Cited by 30 publications

(21 citation statements)

References 7 publications

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“…Hence, we compare the predicted critical self-field parameters for the two trial functions, 1 f and 2 f in (15) decreases. This behavior is intuitively obvious, since the bunches of charge are radially compressed while keeping b N fixed; hence, the electric field will rise due to the increase in radial beam density.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…In this section, we will apply the bunched annular beam equilibrium theory to three experiments, namely, the 1.3 GHz RKA experiment at LANL [1], the 1.3 GHz relativistic klystron oscillator (RKO) experiment at AFRL [2], and the 9.4 GHz backward wave oscillator (BWO) experiment at the University of New Mexico [3]. All three of these experiments utilize an annular electron beam for high-power microwave generation, whose transverse size is comparable to the conductor wall.…”

Section: Application To Annular Beam Experimentsmentioning

confidence: 99%

“…By using density test functions to compute the maximum self-field parameters for annular beams, we compare theoretical parameter limits with those corresponding to three annular beam experiments -1.3 GHz RKA experiment at LANL [1], 1.3 GHz RKO [2] experiment at AFRL, and the 9.4 GHz BWO [3] experiment at the University of New…”

Section: Introductionmentioning

confidence: 99%

“…However, the increase in beam-wall interaction, especially when the beam becomes strongly bunched during highpower operation of such a device, may require a stronger magnetic field for beam focusing. Indeed, many HPM devices driven by annular beams suffer from considerable beam losses and the well-known problem of rf pulse shortening [1,3].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, a number of high-power microwave (HPM) experiments have employed high-intensity bunched annular relativistic electron beams, such as the relativistic klystron amplifier (RKA) experiment at Los Alamos National Laboratory (LANL) [1], relativistic klystron oscillator (RKO) experiment at Air Force Research Laboratory (AFRL) [2], and the backward wave oscillator (BWO) at the University of New Mexico [3]. Since an annular beam typically has a transverse size, which is of the order of the conductor wall radius, the beam-wall interaction can be increased compared to the interaction of a pencil beam with a wall.…”

Section: Introductionmentioning

confidence: 99%

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Equilibrium and confinement of bunched annular beams

Hess

Chen

2002

Physics of Plasmas

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The azimuthally invariant cold-fluid equilibrium is obtained for a periodic, strongly bunched charged annular beam with an arbitrary radial density profile inside of a perfectly conducting cylinder and an externally applied uniform magnetic field. The selfelectric and self-magnetic fields, which are utilized in the equilibrium solution, are computed self-consistently using an electrostatic Green's function technique and a Lorentz transformation to the longitudinal rest frame of the beam. An upper bound on the maximum value of an effective self-field parameter for the existence of a bunched annular beam equilibrium is obtained. As an application of the bunched annular beam equilibrium theory, it is shown that the Los Alamos National Laboratory relativistic klystron amplifier experiment is operating slightly above the effective s elf-field parameter limit, and a discussion of why this may be the cause for their observed beam loss and microwave pulse shortening is presented. The existence of bunched annular beam equilibria is also demonstrated for two other high-power microwave (HPM) experiments, the relativistic klystron oscillator experiment at Air Force Research Laboratory and the backward wave oscillator experiment at the University of New Mexico. In general, the results of the equilibrium analysis will be useful in the determination of the stability properties of strongly bunched annular beams in HPM devices.

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Section: Numerical Resultsmentioning

confidence: 99%