Necessary condition for current neutralization of an ion beam propagating into vacuum from a self-magnetically Bθ-insulated ion diode

Zieher, K.W.

doi:10.1016/0168-9002(84)90027-5

Cited by 8 publications

(1 citation statement)

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“…In the self-magnetically insulated ion diode, developed by Zieher (1984a), PIB divergence was about 1.5°-3.6°for different anodes. A necessary condition for current neutralization of an ion beam from a self-magnetically B θ -insulated ion diode is derived (Zieher, 1984b). The requirement for which is the following: the magnetic field of the cathode outside the diode gap is small enough to still allow electrons to flow from the cathode along with the beam.…”

Section: Introductionmentioning

confidence: 99%

The influence of a shield on intense ion beam transportation

2013

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This article presents the results of a study on transportation of a pulse ion beam of gigawatt power. This beam is formed by a self-magnetically insulated diode with an explosive-emission cathode. The experiments have been performed using the TEMP-4M pulsed ion accelerator configured in double-pulse formation mode with the first negative pulse (300-500 ns, 100-150 kV), followed by the second positive pulse (150 ns, 250-300 kV). To increase the effectiveness of ion beam focusing, a metal shield is installed on a grounded electrode. Investigations are performed using a strip focusing diode, a cone diode, and a spiral diode with metal shields of different constructions. We observed that the beam diameter at the focus decreases from 60 mm (without shield) to 40-42 mm (with a shield), which leads to an increase in the energy density by a factor of 1.5-2 being 4-5 J/cm 2 at the focus. We analyzed different mechanisms for ion trajectories deviation from an ideal one: Coulomb repulsion due to incomplete space charge neutralization, influence of electromagnetic fields, etc. It is found that for a strip focusing diode the concentration of low-energy electrons accompanying the ion beam exceeds the concentration of ions by 1.3-1.5 times. The use of a metal shield improves the transportation properties of the ion beam by keeping neutralizing electrons within the beam volume which ensures its space charge neutralization during the transport.

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Section: Introductionmentioning

confidence: 99%