Compound-lens injector for a pulsed 13-TW electron beam

Sanford, T.W.L.; Poukey, J. W.; Halbleib, J.A.; Mock, R. C.

doi:10.1063/1.353391

Journal of Applied Physics

1993

DOI: 10.1063/1.353391

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Compound-lens injector for a pulsed 13-TW electron beam

T.W.L. Sanford

J. W. Poukey

J.A. Halbleib

et al.

Abstract: Monoenergetic electron beam generation from a highdensity plasma produced by a 2TW, 50fs laser pulse AIP Conf.

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Cited by 6 publications

References 12 publications

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Very intense pulsed electron beam

Sanford¹,

Halbleib²,

Welch³

et al. 1994

Journal of Applied Physics

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An intense beam of pulsed electrons has been developed using the extended planar-anode diode to extract and focus the HERMES-III beam in a low-pressure gas cell without anode destruction. Measurements and a simulation model are compared and found in good agreement for focal lengths of ∼7–8 cm. They show that with this source a peak dose (peak dose rate) ∼200 J/g (8×1014 rad/s) in graphite can be generated with useful areas of 70 cm2. For the shorter focal length of ∼11 cm, the model predicts that a peak dose (peak dose rate) of 3800 J/g (1.5×1016 rad/s) can be generated over an area of 5 cm2.

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Very intense pulsed electron beam

Sanford¹,

Halbleib²,

Welch³

et al. 1994

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

Controlling hollow relativistic electron beam orbits with an inductive current divider

et al. 2015

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A passive method for controlling the trajectory of an intense, hollow electron beam is proposed using a vacuum structure that inductively splits the beam's return current. A central post carries a portion of the return current (I1), while the outer conductor carries the remainder (I2). An envelope equation appropriate for a hollow electron beam is derived and applied to the current divider. The force on the beam trajectory is shown to be proportional to (I2-I1), while the average force on the envelope (the beam width) is proportional to the beam current Ib = (I2 + I1). The values of I1 and I2 depend on the inductances in the return-current path geometries. Proper choice of the return-current geometries determines these inductances and offers control over the beam trajectory. Solutions using realistic beam parameters show that, for appropriate choices of the return-current-path geometry, the inductive current divider can produce a beam that is both pinched and straightened so that it approaches a target at near-normal incidence with a beam diameter that is on the order of a few mm.

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Particle-in-cell simulations of electron beam control using an inductive current divider

et al. 2015

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Kinetic, time-dependent, electromagnetic, particle-in-cell simulations of the inductive current divider are presented. The inductive current divider is a passive method for controlling the trajectory of an intense, hollow electron beam using a vacuum structure that inductively splits the beam's return current. The current divider concept was proposed and studied theoretically in a previous publication [Swanekamp et al., Phys. Plasmas 22, 023107 (2015)]. A central post carries a portion of the return current (I1), while the outer conductor carries the remainder (I2) with the injected beam current given by Ib = I1 + I2. The simulations are in agreement with the theory which predicts that the total force on the beam trajectory is proportional to (I2−I1) and the force on the beam envelope is proportional to Ib. Independent control over both the current density and the beam angle at the target is possible by choosing the appropriate current-divider geometry. The root-mean-square (RMS) beam emittance (εRMS) varies as the beam propagates through the current divider to the target. For applications where control of the beam trajectory is desired and the current density at the target is similar to the current density at the entrance foil, there is a modest 20% increase in εRMS at the target. For other applications where the beam is pinched to a current density ∼5 times larger at the target, εRMS is 2–3 times larger at the target.

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Compound-lens injector for a pulsed 13-TW electron beam

Abstract: Monoenergetic electron beam generation from a highdensity plasma produced by a 2TW, 50fs laser pulse AIP Conf.

Cited by 6 publications

References 12 publications

Very intense pulsed electron beam

Very intense pulsed electron beam

Controlling hollow relativistic electron beam orbits with an inductive current divider

Particle-in-cell simulations of electron beam control using an inductive current divider

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