Foil Focusing of Electron Beams

Fernsler, R. F.; Hubbard, R. F.; Slinker, S. P.

doi:10.21236/ada219511

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Besides high efficiency, other advantages include (a) Less weight as no coil is needed to produce external magnetic field in high peak power reltron. The grids appear as infinitesimally thin foils that act like electrostatic lenses of positive image charges to focus the approaching beam . (b) Additional mode converter is unnecessary.…”

Section: Introductionmentioning

confidence: 99%

Cold‐test of reltron modulation section and PIC simulation study on output power and efficiency

Shee

Dwivedi

2019

Int J RF Microw Comput Aided Eng

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Parametric analysis and cold test of reltron modulation section are presented along with particle-in-cell (PIC) simulation results. A cavity is designed to have maximum separation among the three resonant modes 0, π/2, and π. Electromagnetic (EM) simulation software packages CST Microwave Studio (MWS) and MAGIC are used to obtain and compare the electromagnetic field patterns and resonant frequencies. Both the software predict the modes with identical field pattern and a difference of 1.3% to 3.8% in resonant frequency. The MAGIC code used here captures all three modes successfully. The designed cavity is fabricated and S 11 is measured. The frequencies of measured S 11 minima differ by 1.6% to 3.5% from the simulated values and closely match with that of the resonant modes. Furthermore, the modulation section is parametrically studied to observe the dependence of the resonant frequencies on the physical dimensions. The key parameters that govern the operating frequency and mode separation are identified. The Q factors are calculated from S11, and after that, the cavity reactance from loaded Q. Particle-in-cell (PIC) simulation results indicate that the mode separation improves overall system performance in terms of output power and efficiency. K E Y W O R D Sdirect energy weapon, microwave tube, relativistic electron beam, resonant cavity, S parameter

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Section: Introductionmentioning

confidence: 99%

Cold‐test of reltron modulation section and PIC simulation study on output power and efficiency

Shee

Dwivedi

2019

Int J RF Microw Comput Aided Eng

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“…For current densities less than or equal to this value, the beam profile is constant over the 60 ns beam current plateau. In this case, the beam profile at the detector depends on the foil focusing effect [4] and foil scattering. Above this current density threshold, the beam profile becomes time dependent part way through the pulse.…”

Section: Particle-in-cell Code Descriptionmentioning

confidence: 99%

Intense electron beam disruption due to ion release from surfaces

Davis

Vermare²,

Hughes³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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A major concern for the DARHT second axis (2 kA, 18.6 MeV, 2000 ns) is that ions or ionized neutrals released from solid surfaces (e.g., apertures, septums, dumps, and targets) by beam impact can be accelerated and trapped by the beam potential. This positive charge could disrupt the beam. To study this, experiments were performed on the DARHT first axis. The beam, focused to a range of diameters, is transmitted through thin foils made of various materials. The time-dependent beam radial profile is measured downstream of the target. For low current density, the downstream-beam profile is time invariant as expected. At higher current density, the downstream-beam radius changes during the pulse followed by transverse instability.

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Foil Focusing of Electron Beams

Cited by 2 publications

References 5 publications

Cold‐test of reltron modulation section and PIC simulation study on output power and efficiency

Cold‐test of reltron modulation section and PIC simulation study on output power and efficiency

Intense electron beam disruption due to ion release from surfaces

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