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Large-area field-ionization detector for the study of Rydberg atoms.

A C L Jones1, A M Piñeiro1, E E Roeder1

  • 1Department of Physics and Astronomy, University of California, Riverside, California 92521, USA.

The Review of Scientific Instruments
|December 3, 2016
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This summary is machine-generated.

A new micro-channel plate (MCP) detector efficiently collects Rydberg positronium (Ps) atoms. This detector offers double the efficiency and half the background noise compared to previous methods.

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Area of Science:

  • Atomic Physics
  • Particle Detection
  • Experimental Physics

Background:

  • Rydberg atoms, highly excited states of atoms, are crucial in various physics experiments.
  • Efficient detection of Rydberg atoms, such as positronium (Ps), is essential for time-of-flight (TOF) measurements.
  • Existing detection methods for Rydberg atoms have limitations in efficiency and background noise.

Purpose of the Study:

  • To develop and characterize a novel micro-channel plate (MCP) based detector for efficient Rydberg positronium (Ps) atom collection.
  • To improve upon existing detection schemes for Rydberg atoms in time-of-flight apparatus.
  • To assess the potential of this detector for broader applications in Rydberg atom detection.

Main Methods:

  • Design and construction of a large-area MCP-based detector.
  • Ionization of incident Rydberg atoms and subsequent collection/focusing of charged particles onto the MCP.
  • Characterization of detector performance, including efficiency and background signal.

Main Results:

  • The developed detector demonstrates a significantly larger collection area compared to the MCP's active area.
  • The detector achieves double the efficiency for detecting Rydberg Ps atoms compared to gamma-ray scintillation detectors.
  • The new detector exhibits half the background signal of the previously used method.

Conclusions:

  • The MCP-based detector provides a more efficient and lower-background alternative for Rydberg Ps detection in TOF experiments.
  • The detector design is adaptable for detecting other Rydberg atom species under specific ionization conditions.
  • Optimizing for electron collection, rather than positive ions, can yield superior time resolution.