Conference Paper

Physics with colder molecular ions: The Heidelberg Cryogenic Storage Ring CSR

DOI: 10.1088/1742-6596/4/1/046 Conference: DR2004: SIXTH INTERNATIONAL CONFERENCE ON DISSOCIATIVE RECOMBINATION: THEORY, EXPERIMENTS AND APPLICATIONS

ABSTRACT 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 (similar to 2 K) and to store beams with kinetic energies between 20 to 300 keV. An electron target based on cooled photocathode technology will serve as a major tool for the study of reactions between molecular ions and electrons. Moreover, atomic beams can be merged and crossed with the stored ion beams allowing for atom molecular-ion collision studies at very low up to high relative energies. The proposed experimental program, centered around the physics of cold molecular ions, is shortly outlined.

0 Bookmarks
 · 
39 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The Facility for Low-energy Antiproton and Ion Research (FLAIR) and a large part of the wide physics program decisively rely on new experimental techniques to cool and slow down antiprotons to 20 keV, in particular on the development of an ultra-low energy electrostatic storage ring (USR). The whole research program connected with anti-matter/matter interactions is only feasible if such a machine will be realized. For the USR to fulfil its key role in the FLAIR project, the development of novel and challenging methods and technologies is necessary: the combination of the electrostatic storage mode with a deceleration of the stored ions from 300 keV to 20 keV, electron cooling at all energies in both longitudinal and transverse phase- space, bunching of the stored beam to ultra-short pulses in the nanosecond regime and the development of an in-ring reaction microscope for antiproton-matter rearrangement experiments. In this contribution, the layout and the expected beam parameters of the USR are presented and its role within FLAIR described.
    01/2006;
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A cold electron target with a cryogenic GaAs-photocathode electron source was developed for the Heidelberg Test Storage Ring. Two independent electron facilities (cooler and target) allow to separate cooling of the ion beam from target operation improving the quality of electron and ion beams. In addition a strong gain in the resolution was achieved with a help of a cryogenic photoelecron source providing dc electron currents up to 0.5 mA with an emission energy spread of about 10 meV. In first recombination measurements at the target, performed on HD +, H3+ and Sc18+, low energy resonant structures at milli-eV collision energies revealed unprecedented low transverse and longitudinal electron temperatures of about 0.5 meV and 0.025 meV, respectively. The photocathode source will be also used to provide cold beams for electron cooling of low-energy ions stored at the electrostatic Cryogenic Storage Ring which will be built at MPIK. The perspectives of photocathode-driven electron coolers operating at very low laboratory energies are discussed.
    AIP Conference Proceedings. 03/2006; 821(1).
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The future Facility for Antiproton and Ion Research (FAIR) at Darmstadt will produce the highest flux of antiprotons in the world. Within the planned complex of storage rings, it will also be feasible to decelerate the antiprotons to about 30 MeV kinetic energy, opening up the unique possibility to create low energy antiprotons and thus, establish low-energy antiproton physics at GSI. In the Facility for Low-energy Antiproton and Ion Research (FLAIR) the antiprotons shall be slowed down by means of two cooler storage rings. In the second one, the Ultra-low energy electrostatic Storage Ring (USR), energies ranging from 300 keV to 20 keV will be available for various in-ring experiments as well as for efficient injection of antiprotons into traps. In the limit of such small beam energies, the realization of efficient electron cooling, employing electron energies of only a few eV is one of the new challenges. In this contribution, a review of the FLAIR facility is given and its deceleration and cooling scheme is elucidated in comparison to the present AD operation scheme. Special emphasis is placed on the problems related to electron cooling at ultra-low energies.
    AIP Conference Proceedings. 03/2006; 821(1).

Full-text (2 Sources)

Download
15 Downloads
Available from
May 20, 2014