Target-Plasma Expansion Induced by 20-MeV Intense Electron Beam

Zhu, Jun; Yu, Hai-jun; Jiang, Xiaoguo; Chen, Nan; Wang, Yuan

doi:10.1109/tps.2010.2061869

Cited by 8 publications

(9 citation statements)

References 3 publications

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“…We have almost the same profile given by the self-similar hydrodynamical plasma expansion into vacuum that is a velocity increases v→∞ as ξ→∞ (Sack & Schamel, 1987). It is clear that beyond ξ > ξ l (limited value), this result does not make sense because n→0, as it is demonstrated by the experimental results of the expanding plasma front, where, it was observed that the velocities of the plasma front reach a steady state after 400 ns (Zhu et al, 2010). The main difference is seen close to the plasma source region where the density is high and the beam did not yet spread out of the plasma bulk to drive the ion motion.…”

Section: Resultsmentioning

confidence: 96%

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Plasma expansion dynamics in the presence of a relativistic electron beam

Benkhelifa

Djebli

2015

Laser Part. Beams

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The dynamics of an electron-ion plasma is studied when a mono-energetic relativistic electron beam penetrates the expanding plasma. Combined effects of thermal pressure and ambipolar electrostatic potential are considered for fully relativistic multi-fluids model where the quasi-neutrality assumption is used for a beam-plasma system. Relativistic effects are considered for both density and velocity of the beam fluid. Ion acceleration is depicted through a spike-like structure resulting from non-local charge separation and associated with the beak-down of quasi-neutrality. The beam initial speed is found to enhance the spike amplitude and change its position. Moreover, relativistic effects are particularly found significant for a non-thermal plasma.

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Section: Resultsmentioning

confidence: 96%

“…Such an interaction, depends on the interaction length and plasma density, may have an adverse effect on the beam propagation and the resultant spot size (Zhu et al, 2010). If the beam density is much less than the plasma density, the latter is sufficient to neutralize the beam space charge and quasi-neutrality can be then assumed.…”

Section: Introductionmentioning

confidence: 99%

Plasma expansion dynamics in the presence of a relativistic electron beam

Benkhelifa

Djebli

2015

Laser Part. Beams

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“…Strong focusing leads to a high density of deposited energy in the target, in the range of 1-100 eV/atom, which results in the formation of plasma on the target surface [3], [4]. In a number of experimental works [5], [6], the target plasma was shown to become an ion emitter. The electric self-field of the electron beam leads to the pulling of ions and the formation of a back stream.…”

Section: Introductionmentioning

confidence: 99%

Observation of the Dynamics of a Focal Spot Using a Long-Pulse Linear Induction Accelerator

Trunev

Skovorodin

Бурдаков

et al. 2020

IEEE Trans. Plasma Sci.

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A diagnostic has been developed to study the focusing dynamics of a high-power electron beam on a target. The diagnostic uses a pinhole camera to observe bremsstrahlung from the converter target. A data acquisition system yields images of the beam focal spot with a frame duration of 20 ns and an almost unlimited recording duration. The focal spot dynamics of a linear induction accelerator with an energy of 1.5 MeV, a current of 1.2 kA and a pulse duration of 350 ns were studied. The focal spot was found to be disrupted within the first 100 ns of the pulse. Defocusing has a complex 3-D character. The feasibility of additional cleaning of the target using an accelerator pre-pulse was shown. Stable beam focusing for up to 200 ns was demonstrated.

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“…The electrons deposit enormous amounts of energy into the target in a small volume during a very short time period ( $ 60 ns), raise the temperature of the material up to more than 2 eV [7], and lead to a violent hydrodynamic motion inside the target. The converter target material may vaporize and rapidly disperse.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations and experiments of beam-target interaction for multipulse bremsstrahlung converter applications

Zhu

Chen

et al. 2012

Phys. Rev. ST Accel. Beams

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The typical response of an x-ray converter impacted by an intense relativistic electron beam is vaporization and rapid expansion. In the multipulse electron beam/target interaction process, the target expands, the density of material decreases, eventually affecting the x-ray output of the system. We report the relation between target material thickness with x-ray doses, and the design of a distributed target for multipulse beam/target interaction application. For a single pulse, we simulated and measured the x-ray doses and spot size on the distributed target, and compared them to similar results made by the standard converter target. For multipulses of microsecond time scale, we measured the change of the distributed target material density. The results indicate that the multipulse converter target design is feasible.

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Target-Plasma Expansion Induced by 20-MeV Intense Electron Beam

Cited by 8 publications

References 3 publications

Plasma expansion dynamics in the presence of a relativistic electron beam

Plasma expansion dynamics in the presence of a relativistic electron beam

Observation of the Dynamics of a Focal Spot Using a Long-Pulse Linear Induction Accelerator

Numerical simulations and experiments of beam-target interaction for multipulse bremsstrahlung converter applications

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