The special time structure of the bunched positron beam makes it very well suited for injection into a cryostatic Penning trap. Here positrons from many pulses may be accumulated and cooled to a temperature of a few Kelvin. These positrons may be used for cooling highly charged ions in order to allow higher precision mass spectroscopy measurments. The initial aim of the project is simply to demonstrate trapping of substantial numbers of positrons. The cold, trapped positrons could also be extracted to form a unique ultra low energy positron beam.
Experiments are already in progress.
Similar to systems containing two electrons these systems could provide insight into many body physics since they lack exchange effects. Since positronium is over three orders of magnitude lighter than ordinary atoms, recoil effects using photons are similarly enhanced.