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Mass Analyzers: Common Types01:19

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Transport dynamics in a high-brightness magneto-optical-trap Li ion source.

Jamie R Gardner1, William R McGehee1,2, Mark D Stiles1

  • 1Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

Journal of Vacuum Science and Technology. B, Nanotechnology & Microelectronics : Materials, Processing, Measurement, & Phenomena : JVST B
|June 1, 2026
PubMed
Summary
This summary is machine-generated.

Laser-cooled gases provide a novel method for generating high-brightness ion beams. A study on a lithium magneto-optical trap ion source (MOTIS) models atom transport, improving focused ion beam applications.

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Area of Science:

  • Atomic physics
  • Ion beam generation
  • Laser cooling

Background:

  • Laser-cooled gases offer an alternative to tip-based methods for high-brightness ion beams.
  • Photoionization of ultracold atoms yields low-emittance, high-brightness ion beams.
  • Magneto-optical trap ion sources (MOTIS) are limited by cold atom transport.

Purpose of the Study:

  • To explore atom transport dynamics in a 7Li MOTIS.
  • To understand limitations on extracted current in MOTIS.
  • To develop a model for atom transport in pulsed MOTIS.

Main Methods:

  • Time-dependent measurements of ionization volume depletion and refilling.
  • Pulsed operation of a 7Li MOTIS.
  • Development of an analytic microscopic transport model.

Main Results:

  • Detailed measurements of atom transport dynamics were performed.
  • An analytic microscopic model for atom transport was developed.
  • The model demonstrated excellent agreement with experimental measurements.

Conclusions:

  • Atom transport is a key factor limiting brightness in MOTIS.
  • The developed model accurately describes atom transport.
  • This work advances the understanding and optimization of MOTIS for focused ion beam applications.