Electron-Beam Guiding and Phase-Mix Damping by an Electrostatically Charged Wire

Prono, D. S.; Caporaso, G.J.; Cole, Andrew G.; Briggs, R.J.; Chong, Y.P.; Clark, J. C.; Hester, R. E.; Lauer, E.J.; Spoerlein, R.L.; Struve, K. W.

doi:10.1103/physrevlett.51.723

Cited by 25 publications

(3 citation statements)

References 5 publications

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“…The demand to use local fields means that we cannot consider the effect of these fields on the electron motion as an adiabatic one, and therefore, the electron motion cannot be described by solutions independent of the axial coordinate with the parameters, which vary adiabatically along the z-axis. At the same time, rapid local variations in the electron motion in the region of the focus may result in strong increase of the effective beam emittance 23,24 and lead to substantial losses of the beam on the chamber walls. 25 The purpose of the present study is to analyze the conditions, which allow us to match an electron beam with the use of a local external magnetic field without substantial losses of the beam current.…”

Section: Introductionmentioning

confidence: 99%

Magnetic matching of beam optics between quasilaminar and phase-mixed states

et al. 2003

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Time and space resolved measurement of the electron temperature, mass density and ionization state in the ablation plasma between two exploding Al wiresa) Electron beams propagating in the ion focused regime ͑Bennett pinch͒ are known as phase-mixed electron beams. Such beams are of interest for various sources of coherent electromagnetic radiation ͑pasotrons, ion-channel lasers, ion-channel guided free-electron lasers͒. Typically, the transition of a beam from a quasilaminar state near the gun to a phase-mixed equilibrium state known as the Bennett pinch is accompanied by the appearance of betatron oscillations. In pasotrons these oscillations play a negative role because they often result in certain beam losses due to the interception of beam electrons oscillating with large amplitudes by the chamber walls. The betatron oscillations and the beam losses associated with them can be monitored by using a weak local external magnetic field ͑magnetic lens͒ in the transition region. This paper is devoted to the analysis of the beam dynamics in the transition region and to the study of the effect of the magnetic lens. With the use of the concept of the free energy of the ensemble of charged particles, the relation between the beam radius in the Bennett pinch and the radii at the entrance and exit from a magnetic lens is derived. The results obtained show that, by using a properly designed and positioned magnetic lens in pasotrons, a halo in the phase-mixed beam can be greatly reduced and the beam losses can be practically eliminated.

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Section: Introductionmentioning

confidence: 99%

Magnetic matching of beam optics between quasilaminar and phase-mixed states

et al. 2003

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“…Previously, REB guiding, focusing, and damping by means of an electrostatically charged wire has proven to be a useful technique in the experimental test accelerator (8 kA, 4.5 MeV, 25 ns, 1 Hz). 9 We report here the first use of a uv-laserionized channel for REB guiding, focusing, and damping in beam-transport experiments over distances of several meters.…”

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confidence: 99%

“…14 Figure 1 shows the experimental configuration which replaced the wire zone on the experimental test accelerator. 9 A commercial injection-locked KrF laser (Lambda Physik EMG 150 ES) was chosen for its high brightness (500 mJ, 27 ns, 0.2 mrad). The output beam of the laser could be varied (with the use of external telescopes) from an area of 0.09 to 2.6 cm 2 .…”

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confidence: 99%