Longitudinal dynamics of laser-cooled fast ion beams: square-well buckets, space-charge effects, and anomalous beam behavior
- Max-Planck-Institut fuer Kernphysik, 69029 Heidelberg (Germany)
We present recent results of our experiments on laser cooling of fast stored ion beams at the Heidelberg Test Storage Ring. The longitudinal motion of the ions is directly cooled by the light pressure force, whereas efficient transverse cooling is obtained indirectly by longitudinal-transverse coupling mechanisms. Laser cooling in novel bunch forms consisting of square-well buckets leads to longitudinally space-charge dominated beams. The observed longitudinal ion density distributions can be well described by a self-consistent mean-field model based on a thermodynamic Debye-Hueckel approach. When applying laser cooling in square-well buckets over long time intervals, hard Coulomb collisions suddenly disappear and the longitudinal temperature drops by about a factor of three. The observed longitudinal behavior of the beam shows strong resemblance with the transition to an Coulomb-ordered ion string.
- OSTI ID:
- 21207926
- Journal Information:
- AIP Conference Proceedings, Vol. 457, Issue 1; Conference: International conference on trapped charged particles and fundamental physics, Asilomar, CA (United States), 31 Aug - 4 Sep 1998; Other Information: DOI: 10.1063/1.57459; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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