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Abstract:
One of the central goals of the Ultra-Low energy
Storage Ring (USR) project within the future Facility for
Low-energy Antiproton and Ion Research (FLAIR) is to
provide very short bunches in the 1-2 nanosecond regime
to pave the way for kinematically complete measurements
of the collision dynamics of fundamental few-body
quantum systems – for the first time on the level of
differential cross sections.
The “short pulse” operation mode may be split up in
two steps: First, the cooled coasting beam of low energy
ions will be adiabatically captured by a high harmonic RF
cavity (20 MHz) into ~50 ns buckets. Second, the beam
will be compressed to very short pulses with a desired
width of only 1-2 ns by an RF buncher located 2 m in
front of the so-called reaction microscope. To efficiently
limit the beam energy spread, RF decompression is then
done at after the experiment to avoid beam losses. In this
contribution, we present numerical investigations of this
very particular operation mode.
