What's the longest time antimatter was able to be stored?

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SUMMARY

The longest recorded storage time for antimatter varies by type. Positrons and antiprotons can be stored for several months in Penning traps, with a notable record of 69 days, 10 hours, and 18 minutes achieved at Fermilab between March 26, 2004, and June 4, 2004. The ALPHA experiment at CERN has successfully stored neutral antihydrogen for approximately 15 minutes, with potential improvements since 2011. Current research indicates that while longer storage times for positrons and antiprotons are feasible, they have not been extensively pursued.

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  • Understanding of Penning traps and their applications in particle physics
  • Familiarity with antimatter types, specifically positrons and antiprotons
  • Knowledge of the ALPHA experiment and its significance in antimatter research
  • Awareness of Fermilab's antiproton accumulator and its historical records
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  • Research advancements in Penning trap technology for longer antimatter storage
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What's the longest time antimatter was able to be stored?
 
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Depends on the type of antimatter you consider. Positrons and antiprotons can be stored for months in penning traps. I guess many years would be possible, but no one seems to bother keeping them that long.

http://gabrielse.physics.harvard.edu/gabrielse/papers/1994/1994_haarsma/chapter1.pdf
Positrons
More antiprotons ("no antiproton losses were detected over a period of several month")

Neutral antihydrogen is significantly harder to store, as it is not charged. The ALPHA experiment at CERN manages to store atoms for something like 15 minutes - probably more now but I didn't see anything new after 2011.
 
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For pbars, I believe the record is 69 days, 10 hours, 18 minutes, from the Fermilab antiproton accumulator. This happened between 26 March 2004 and 4 June 2004.
 
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