The Cryogenic Storage Ring project

A novel cryogenic electrostatic storage ring is planned to be built at the Max-Planck Institute for Nuclear Physics in Heidelberg. The machine is expected to operate at low temperatures (2K) and to store beams with kinetic energies between 20 to 300 keV. Moreover, atomic beams can be merged and crossed with the stored ion beams allowing for atom molecularion collision studies at very low up to high relative energies.
In most molecular studies, the black body radiation present in the experimental setup limits the ability to compare directly data with theoretical predictions, especially because of the unknown rotational distribution of the stored ion beam. Hence, to be able to investigate molecular ions in exactly their lowest well-defined quantum states, a radiational temperature of a few Kelvin in the storage ring and a storage period of at least 1000 s are necessary. Moreover, the increased interest in astro-chemistry and the large amount of data collected concerning the composition of interstellar medium present an exciting challenge for theoreticians who need as a input he reaction rate coefficients (DR, electron impact) measured in low temperature.
The CSR project is lead by Prof. Andreas Wolf. Our group is very much involved in the planning and construction of the CSR especially with Dr. Michael Rappaport. The CSR is expected to be operational in 201?. A prototype of the CSR project has been constructed and preliminarily experiments were performed. The prototype contains an electrostatic ion beam trap which was used, among other things to derive the pressure inside the chamber.

A scheme of the prototype experimental setup. Ions are produced in an ion source, accelerated, and steered by a beam cleaner (thus neutrals particles are stopped), mass selected and injected into the electrostatic ion beam trap. Laser pulse is fired perpendicularly to the trapped ion beam. Product neutral fragments are counted on a Micro Channel Plate detector located downstream.

Recent experiments have been carried out with the prototype including the delayed emission from Al4-.

More literature:

  • "Physics with colder molecular ions: The Heidelberg Cryogenic Storage Ring"
  • "Prototypes and construction of the CSR"