Pico-coulomb charge measured at BELLA to percent-level precision using a Turbo-ICT:
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Pico-coulomb charge measured at BELLA to percent-level precision using a Turbo-ICT:

  • Author(s): Nakamura, K
  • Mittelberger, D E
  • Gonsalves, A J
  • Daniels, J
  • Mao, H-S
  • Stulle, F
  • Bergoz, J
  • Leemans, W P
  • et al.
Abstract

Precise diagnostics of picocoulomb level particle bunches produced by laser plasma accelerators (LPAs) can be a significant challenge. Without proper care, the small signals associated with such bunches can be dominated by a background generated by laser, target, laser–plasma interaction and particle induced radiation. In this paper, we report on first charge measurements using the newly developed Turbo-ICT for LPAs. We outline the Turbo-ICT working principle, which allows precise sub-picocoulomb measurements even in the presence of significant background signals. A comparison of the Turbo-ICT, a conventional integrating current transformer (ICT) and a scintillating screen (Lanex) was carried out at the Berkeley Lab Laser Accelerator. Results show that the Turbo-ICT can measure sub-picocoulomb charge accurately and has significantly improved noise immunity compared to the ICT.

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