The HITRAP decelerator and trap facility
HITRAP is a planned ion trap facility which is designed for capturing
and cooling of highly charged ions (HCI) produced at the
GSI-accelerator complex. In the HITRAP facility heavy highly charged
ions will be available as bare nuclei (up to uranium U92+),
hydrogen-like ions or few-electron systems at low temperatures. Highly
charged ions are accelerated in the heavy-ion synchrotron SIS, stripped
in a foil to the desired charge state and injected into the storage
ring ESR. In the ESR the ions will be decelerated to an energy of 3
MeV/u. They are then extracted in a fast-extraction mode as short ion
bunches, are decelerated and cooled to helium temperatures in Penning
traps.
With this novel technique of
deceleration, trapping and cooling of highly charged ions, atomic
physics studies on slow HCI up to bare uranium interacting with
photons, atoms, molecules, clusters, surfaces, and solids will be
performed. In addition to collision studies, high-accuracy atomic
physics experiments on trapped HCI are part of the atomic physics
program of the HITRAP facility at the ESR. As examples, the measurement
of the g-factor of a bound electron in hydrogen-like ions will provide
a further stringent test of strong field QED calculations and
high-accuracy mass spectrometry will allow for a precise determination
of atomic binding energies in few-electron systems. The technological
experience of deceleration, trapping and cooling of HCI, which will be
gained at the HITRAP facility, will be employed for a similar trap
facility at the future storage ring NESR.
Experiments with highly charged ions at low energies:
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