Can a single proton be trapped in a Penning trap? And what happens to it?

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SUMMARY

A single proton can indeed be trapped in a Penning trap, a device that utilizes a combination of electric and magnetic fields to confine charged particles. Research has demonstrated the feasibility of trapping protons, with notable experiments conducted by physicists at institutions such as the Max Planck Institute. Observations of trapped protons reveal that they can remain stable for extended periods, although factors such as leakage and potential formation of hydrogen atoms are critical considerations in these experiments.

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Can a single proton be held in a Penning trap and for how long? Has it been done? Who did it?
 
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http://www.aip.org/png/html/penning.htm

This is a graphic of a Penning trap. I am hoping to come across an expert on Penning traps who can discuss the thresholds, i.e can one proton be trapped. Is there any way to observe the trapped ions? Is there any experiments done with protons and what happens to them while in a trap, i.e. do they leak out, do they form hydrogen while in there, etc.?
 
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