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A versatile and reliably reusable ultrahigh vacuum viewport.

K J Weatherill1, J D Pritchard, P F Griffin

  • 1Department of Physics, Durham University, Durham DH1 3LE, United Kingdom. k.j.weatherill@durham.ac.uk

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Summary

We developed improved ultrahigh vacuum (UHV) viewports using a modified solder seal design. These viewports achieve low leak rates, enabling precise measurements in sensitive vacuum environments.

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Area of Science:

  • Physics
  • Materials Science
  • Vacuum Technology

Background:

  • Ultrahigh vacuum (UHV) systems require specialized components for observation and manipulation.
  • Previous preflattened solder seal designs offered a basis for UHV viewports.
  • Long-term performance and reliability are critical for UHV applications.

Purpose of the Study:

  • To present an improved viewport design for UHV applications.
  • To enhance the long-term performance and reliability of UHV viewports.
  • To validate the performance of the new viewport design through rigorous testing.

Main Methods:

  • Modification of a preflattened solder seal design for UHV viewports.
  • Leak testing of the modified viewports to assess gas permeation.
  • Integration of viewports into a vacuum chamber for atom trap experiments.
  • Measurement of atom trap lifetime to infer residual gas pressure.

Main Results:

  • Viewports demonstrated leak rates below 10(-10) atm cm(3)/s.
  • Atom trap lifetimes of 9.5 seconds were measured, indicating UHV conditions.
  • The inferred background pressure was approximately 10(-10) Torr.
  • A simplified design for direct UHV seal to vacuum pipes was also developed.

Conclusions:

  • The modified UHV viewport design significantly improves long-term performance and reliability.
  • The viewports are suitable for demanding UHV applications requiring low leak rates.
  • The design facilitates sensitive experiments by maintaining low background pressures.