Abstract
A small electrostatic storage ring is the central machine of the Frankfurt Ion Storage Experiments (FIRE) which will be built at the new Stern-Gerlach Center of Frankfurt University. As a true multiuser, multipurpose facility with ion energies up to 50 keV, it will allow new methods to analyze complex many-particle systems from atoms to very large biomolecules. With envisaged storage times of some seconds and beam emittances in the order of a few mm mrad, measurements with up to 6 orders of magnitude better resolutions as compared to single-pass experiments become possible. In comparison to earlier designs, the ring lattice was modified in many details: Problems in earlier designs were related to, e.g., the detection of light particles and highly charged ions with different charge states. Therefore, the deflectors were redesigned completely, allowing a more flexible positioning of the diagnostics. Here, after an introduction to the concept of electrostatic machines, an overview of the planned FIRE is given and the ring lattice and elements are described in detail.
Highlights
Existing electrostatic storage rings [1,2] have proven to be a valuable tool for molecular and atomic physics in the low-energy regime
In contrast to experiments with traps, an electrostatic storage ring has the advantage of being able to record the momenta of all neutral fragments
Future facilities like the cryogenic storage ring at the Max-Planck Institut, Heidelberg [10], the DESIREE project in Stockholm [11], or the proposed FLAIR facility at GSI [12] will use electrostatic rings as a central machine and the experience from the ring of Frankfurt Ion Storage Experiments (FIRE) will be extremely beneficial for these projects
Summary
Existing electrostatic storage rings [1,2] have proven to be a valuable tool for molecular and atomic physics in the low-energy regime. A reaction microscope [6] will be integrated in a low-energy storage ring, allowing the Frankfurt Ion Storage Experiments (FIRE) the analysis of many-particle fragmentation processes of atoms and molecules with unrivaled resolution and completeness. In contrast to experiments with traps, an electrostatic storage ring has the advantage of being able to record the momenta of all neutral fragments. In such a machine, molecules can be fragmented and detected by state-of-the-art imaging techniques with high momentum resolution. In traps, where ions are controlled by nonlinear electric and magnetic fields, such precision measurements are hardly possible
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