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Mikael Elfman

Researcher

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On-line measurement of proton beam current in pA range

Author

  • Vaida Auzelyte
  • F Andersson
  • Mikael Elfman
  • Per Kristiansson
  • Jan Pallon
  • Marie WegdĂ©n
  • Charlotta Nilsson
  • Natalia Arteaga

Summary, in English

A MeV proton beam with a current in the range of fA-nA is usually measured using a secondary beam signal that is dependent on a sample or requires noise-free accurate charge integration in a Faraday cup. We propose a simple on-line beam current measurement setup that can be used to directly measure beam current during ion beam analysis. A fast beam blanker is used to modulate the beam position after the last set of collimator slits in and out of a mini Faraday cup connected to fA-sensitive electrometer. Less than 100 fA current can be measured during an undisturbed irradiation with kHz sampling frequency. The fast, simple and easily controlled current measurement set-up is going to be routinely used for ion beam analysis and modification at the new Lund sub-micron beam line. (c) 2006 Elsevier B.V. All rights reserved.

Department/s

  • Nuclear physics

Publishing year

2006

Language

English

Pages

760-763

Publication/Series

Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

Volume

249

Document type

Journal article

Publisher

Elsevier

Topic

  • Subatomic Physics

Keywords

  • beam blanker
  • Faraday cup
  • low beam current
  • beam control

Status

Published

Research group

  • Nuclear Microprobe

ISBN/ISSN/Other

  • ISSN: 0168-583X