Influence of the space charge of an ion beam on the time-of-flight diagnostics of its composition

A. Pushkarev, X. P. Zhu, C. C. Zhang, A. Prima, Y. Li, Yu Egorova, M. K. Lei

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Abstract

The results of time-of-flight diagnostics of the composition of high-intensity pulsed ion beams are presented. The experiments were performed on a diode of focusing and flat geometry, in the mode of self-magnetic insulation of electrons (accelerating voltage 250-300 kV, pulse duration 120 ns, ion current density 20-300 A/cm2), and a focusing diode in an external magnetic insulation mode (300 kV, 80 ns, 100-200 A/cm2). A delay in the registration of protons by 40-50 ns (on the drift path 14-16 cm) was found in the absence of a delay in the registration of heavy ions. It has been shown that this delay can be related to the deceleration of light ions during the transport from the diode to a collimated Faraday cup. This effect of spatial compression of the ion beam in the direction of the drift increases its pulse power but complicates the time-of-flight diagnostics of its composition.

Original languageEnglish
Article number103303
JournalReview of Scientific Instruments
Volume90
Issue number10
DOIs
Publication statusPublished - 1 Oct 2019

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ASJC Scopus subject areas

  • Instrumentation

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