Measurement of Energy Distribution of Output Electrons From a Microchannel Plate Based on Vacuum Photodiode

Measurement of Energy Distribution of Output Electrons From a Microchannel Plate Based on Vacuum Photodiode

Citation

J. Huang, D. Wang, Y. Lei, Y. Wang, P. Deng, H. Cai, and J. Liu, “Measurement of Energy Distribution of Output Electrons From a Microchannel Plate Based on Vacuum Photodiode,” IEEE Access, vol. 9, pp. 144047–144053, 2021. doi: 10.1109/ACCESS.2021.3121718. 

Keywords

  • Microchannel Plate (MCP)
  • Energy Distribution of Output Electrons (EDOE)
  • Vacuum Photodiode
  • Pulse Light Source (Ti-sapphire femtosecond laser)
  • Most Probable Electron Energy (MPE)
  • Full Width at Half Maximum (FWHM)
  • Simulation (CST Studio Suite)
  • Unsaturated Operation

Brief

This article describes an experimental method for measuring the energy distribution of output electrons from a microchannel plate. 

Summary

The article, "Measurement of Energy Distribution of Output Electrons From a Microchannel Plate Based on Vacuum Photodiode", published in IEEE Access in 2021, describes a method for measuring the energy distribution of electrons emitted from a microchannel plate (MCP). The authors, affiliated with the College of Physics and Optoelectronic Engineering, Shenzhen University, China, used a vacuum photodiode, excited by a 266 nm Ti-sapphire femtosecond laser, to generate electrons. These electrons were then focused onto the MCP using a magnetic lens.

By analyzing the relationship between the bias voltage applied to a charge collector and the resulting electron output, the authors were able to determine the energy distribution curve of the electrons. Their findings indicated that the energy distribution curve exhibited a sharp peak and a long tail. The study revealed a most probable electron energy (MPE) of 12.64 eV and a full width at half maximum (FWHM) of 29.23 eV when a voltage difference of 700 V was applied across the MCP. The authors compared their experimental results to simulations conducted using CST Studio Suite, finding consistency between the two. The simulation yielded an MPE of 10.63 eV and an FWHM of 22.436 eV. The authors attributed the discrepancy between the experimental and simulated results to the fixed impinging angle used in the simulation, in contrast to the variable impinging angle in the experimental setup. The authors concluded that the energy distribution curve's shape, characterized by a sharp peak and a long tail, is a significant finding.

Origin: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9583274

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