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High ion-acceleration by employing a low-γ intense electron-beam

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2 Author(s)
T. Vijayan ; Accel. & Pulse Power Div., Bhabha Atomic Res. Centre, Bombay, India ; P. Roychowdhury

Analyses of results of ion acceleration employing intense electron-beam revealed that the nucleon energy attained per unit energy investment scaled inversely with γ. Total energy scaling is supported by a potential well sustained over a long distance by suitable beam-duration. Following this, a low γ~1.49, 6 kA, 40 ns FWHM electron beam from KALI-200 was focused into a short dielectric collimator and propagated in vacuum for durations of 15-150 ns, and ions were accelerated to nucleon energy over 20-30 MeV/kJ with ion current ~kA/kJ. The enhancement in ion energy was also attributed to the low-γ assisted peak Poisson field Ez~C0Ieecδ, small well-length δ∝βe, and ion-charge multiplication. The minimum γ is decided by desired high electric field for intense electron-beam generation by field emission and maximum multiple ionizations

Published in:

IEEE Transactions on Plasma Science  (Volume:28 ,  Issue: 6 )