Heavy Ion Cooler Research Articles

Simulation and Observation of the Long-Time Evolution of the Longitudinal Instability in a Cooler Storage Ring

In the ESR heavy-ion cooler storage ring at GSI the exponential growth and the subsequent saturation phase of the longitudinal instability in space charge dominated ion beams can be monitored with high resolution. Kinetic simulations together with the experimental data lead to a new insight into the effects of space charge and electron cooling on the long-time evolution of the instability. In the simulations we observe the continuous excitation of long-lived collective modes generated by particle trapping in the self-excited potential, which suggest that previous ``overshoot'' concepts need revision.

The investigation of nuclear structure with storage rings — present and future

Heavy-ion cooler and storage rings offer a rich field of new and unique possibilities to study nuclear structure. Cooling creates beams of high phase space density for high-resolution experiments. In first experiments atomic masses of more than hundred new nuclides were measured with high precision. Future experiments with cooled energetic beams of exotic nuclei allow high precision nuclear structure studies in direct reactions such as (d, p), (p, p′), or Coulomb breakup. The extension of these investigations to electron scattering in a heavy-ion-electron collider will be discussed.

Precision laser spectroscopy of highly charged ions

Recently, intense beams of highly charged ions have become available at heavy ion cooler rings. The obstacle for producing these highly interesting candidates is the large binding energy of K-shell electrons in heavy systems in excess of 100 keV. One way to remove these electrons is to strip them off by passing the ion through material. In the cooler ring, the ions are cooled to a well defined velocity. At the SIS/ESR complex it is possible to produce, store, and cool highly charged ions up to bare uranium with intensities exceeding 108 atoms in the ring. This opens the door for precision laser spectroscopy of hydrogenlike-heavy ions, e.g.209Bi82+, and allows to examine the interaction of the single electron with the large fields of the heavy nucleus, exceeding any artificially produced electric and magnetic fields by orders of magnitude. In the electron cooler the interaction of electrons and highly charged ions otherwise only present in the hottest plasmas can be studied.

Plans for driver and target studies for heavy-ion inertial fusion by intense heavy-ion linac and cooler synchrotron

Basic experiments for heavy-ion inertial fusion by using an intense heavy-ion linac and a heavy-ion cooler synchrotron are proposed. The planned accelerator complex consists of nine heavy-ion linacs, a heavy-ion cooler synchrotron, two storage rings, 24 beam buncher rings and a chamber for target experiments. In a first phase an old accelerator system will be improved to make it able to accelerate intense beams of heavy ions, such as Xe, with charge to mass ratio ofq/A=1/6, up to 2.4 MeV/a.m.u.

Exotic atoms ? a new scope

Heavy ion cooler rings have been installed in a number of laboratories around the world. They allow for a new generation of experiments using the products of high energy heavy ion collisions, i.e. highly charged andpossibly radioactive ions. The first series of investigations at the SIS-ESR facility at the GSI, reviewed here, includes the observation of beta decay into a bound state of a highly charged ion andprecision spectroscopy of inner-shell levels by means of X-ray spectroscopy, laser spectroscopy andresonant di-electronic recombination.

The heavy ion cooler and synchrotron ring at GSI

The heavy ion cooler and synchrotron ring at GSI