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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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Compact electrostatic beam optics for multi-element focused ion beams: simulation and experiments.

Jose V Mathew1, Sudeep Bhattacharjee

  • 1Department of Physics, Indian Institute of Technology, Kanpur, Uttar Pradesh, India.

The Review of Scientific Instruments
|February 2, 2011
PubMed
Summary
This summary is machine-generated.

A double Einzel lens system (ELS) significantly improves focused ion beam quality, reducing emittance by 44% compared to a single ELS. Grounding apertures further enhance performance, achieving a 10 μm beam spot size.

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Area of Science:

  • Plasma Physics
  • Ion Beam Optics

Background:

  • Multi-element focused ion beam (MEFIB) systems require precise beam control.
  • Microwave multicusp plasma sources generate ion beams suitable for various applications.

Purpose of the Study:

  • To design and optimize electrostatic beam optics for a MEFIB system.
  • To investigate the performance of single and double Einzel lens systems (ELS) with apertures.

Main Methods:

  • Utilized AXCEL-INP and SIMION beam simulation codes.
  • Incorporated experimental data for simulation input parameters.
  • Investigated single and double ELS configurations with varying apertures and potentials.

Main Results:

  • Double ELS reduced rms emittance from ~0.9 to ~0.5 mm mrad (with 0.5 mm aperture).
  • Grounding apertures further improved emittance to ~0.1 mm mrad, achieving a ~10 μm beam spot size.
  • Optimized double ELS design demonstrated robustness with specified tolerances.

Conclusions:

  • A double ELS offers superior performance for MEFIB systems compared to a single ELS.
  • Aperture grounding is a critical factor for achieving high-quality focused ion beams.
  • Simulation results align well with experimental findings, validating the design.