Intense space-charge beam physics relevant to relativistic klystron amplifiers

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

doi:10.1109/27.338288

Cited by 29 publications

(12 citation statements)

References 4 publications

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“…However, the critical result of our theory, namely the effective space-charge density limit in (13), is essentially unaffected by the choice of b γ in the typical parameter ranges for HPM sources, as we will now demonstrate.…”

Section: Application To Annular Beam Experimentsmentioning

confidence: 98%

“…The other two experiments that we will examine, namely the AFRL RKO experiment [2] and the University of New Mexico BWO experiment [3], will be shown to be operating below the critical limit in (13). Although, the BWO experiment did measure beam loss it is most likely not due to the present theory (the BWO has a higher background gas pressure compared to the RKA and RKO experiments) [3].…”

Section: Application To Annular Beam Experimentsmentioning

confidence: 99%

“…However, their current limit does not include the effect of beam confinement by magnetic focusing, and hence, does not explain the beam halo formation or the beam loss often associated with microwave pulse shortening. We will show that the RKA experiment is operating slightly above the effective self-field parameter limit in equation (13).…”

Section: Application To Annular Beam Experimentsmentioning

confidence: 99%

“…In Ref. 13, the LANL group provided an analysis of a modulated space-charge current limit due to the large potential depression for HPM sources, which they claimed may be responsible for the amount of microwave power which can be extracted in their RKA experiment. However, their current limit does not include the effect of beam confinement by magnetic focusing, and hence, does not explain the beam halo formation or the beam loss often associated with microwave pulse shortening.…”

Section: Application To Annular Beam Experimentsmentioning

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: Application To Annular Beam Experimentsmentioning

confidence: 98%

Section: Application To Annular Beam Experimentsmentioning

confidence: 99%

Section: Application To Annular Beam Experimentsmentioning

confidence: 99%

Section: Application To Annular Beam Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

Equilibrium and confinement of bunched annular beams

Hess

Chen

2002

Physics of Plasmas

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“…They obtained an efficiency of 50% for production of 3 GW pulses at 1.3 GHz. Researchers at Los Alamos National Laboratory (LANL) [3,4] and Mission Research Corporation (MRC) [5] pursued programs to demonstrate longer and repetitively pulsed devices. MRC achieved approximately 500 MW, 800 ns pulses in L-Band and another promising source at X-Band.…”

mentioning

confidence: 99%