[en] This report summarizes the present status of the CRYRING project. The project is centered around a synchrotron/storage ring of maximum rigidity 1.44 Tm, corresponding to an energy of 24 MeV per nucleon at a charge-to-mass ratio q/A = 0.5. It is mainly intended for highly charged, heavy ions produced by an electron-beam ion source (CRYSIS). Light atomic or molecular ions can also be injected from a small plasmatron source (MINIS). Ions from the ion sources are accelerated electrostatically to 10 keV per nucleon and transported to a radiofrequency-quadrupole linear accelerator (RFQ) which brings them to 300 keV per nucleon. The ions are inflected electrostatically into the ring where they are accelerated using a driven drift tube. The stored ions will be cooled by an electron cooler. Fig. 1 shows a layout of the CRYRING facility

[en] A status report of the electron cyclotron resonance (ECR) ion source injector project at the Manne Siegbahn Laboratory in Stockholm is given. The ECR ion source is presently in its commissioning state. The aim of the project is to deliver high currents of a wide variety of ion beams, with energies up to 300q keV, for injection into the accelerator and storage ring CRYRING as well as for atomic and surface physics experiments. The ECR source, of the HYPERNANOGAN type, is delivered by Pantechnik s.a. in France. The source is a 14.5 GHz single stage plasma device capable of producing highly charged ions of intermediate masses and intermediately charged ions of the high masses; also singly charged and molecular ions are expected. (orig.)

No abstract available

[en] In the CRYRING storage ring weak beams of electron-cooled highly charged ions have been studied. When the intensity of the ion beam decays below a certain limit the momentum spread of the beam show a sudden transition to a state with much lower momentum spread. Similar observations have earlier been made at GSI, and have been interpreted as a one-dimensional ordering of the beam. For a beam of 7.4 MeV/u Xe³⁶⁺ we have varied the electron density and studied how that affects the particle number at transition, the momentum spread of the ion beam, and the Schottky power. The transition occurs at particle distances between 1 and 35 cm, depending on the cooling rate.

[en] Some years ago, it was found at GSI, Darmstadt, that the momentum spread of electron-cooled beams of highly charged ions dropped abruptly to very low values when the particle number decreased to below about 5000 ions. This has been interpreted as an ordering of the ions, such that they line up after one another without being able to pass their neighbours. Such transitions have now also been observed at CRYRING, and it has been seen that the drop in momentum spread is accompanied by a similar drop in Schottky-noise power. Using a model for the particle distribution in a beam with string-like order, characterized by a certain minimum distance between the ions, theoretical calculations of Schottky-noise power have been performed. It is found that the model can reproduce the reduction in noise power, and the good agreement with the experimental data gives evidence for spatial ordering of the ions. (author)

No abstract available

No abstract available

[en] Some years ago it was found at GSI in Darmstadt that the momentum spread of electron-cooled beams of highly charged ions dropped abruptly to very low values when the particle number decreased to 10 000 or less. This has been interpreted as an ordering of the ions, such that they line up after one another in the ring. We report observations of similar transitions at CRYRING, including an accompanying drop in Schottky-noise power. We also introduce a model of the ordered beam from which the Schottky-noise power can be calculated numerically. The good agreement between the model calculation and the experimental data is seen as evidence for a spatial ordering of the ions

[en] The features of the vacuum system of the accelerator/storage ring CRYRING are described. Using NEG-pumps based on the St 707 getter developed by SAES Getters (Milan, Italy) of low temperature type activated at 300⁰C and operating at room temperature in combination with sputter ion-pumps, a pressure in the low 10^-11 mbar (N₂ eqv) region has been achieved without any bake-out of the vacuum system. The design value, 5x10^-12 mbar (N₂ eqv), is expected to be reached after a complete bake-out of the system at 300^oC. (author)

No abstract available