Author: Litvinov, S.A.
Paper Title Page
MOPEA013 Radioactive Beam Accumulation for a Storage Ring Experiment with an Internal Target 91
  • F. Nolden, C. Dimopoulou, R. Grisenti, C.M. Kleffner, S.A. Litvinov, W. Maier, C. Peschke, P. Petri, U. Popp, M. Steck, H. Weick, D.F.A. Winters, T. Ziglasch
    GSI, Darmstadt, Germany
  A radioactive 56Ni beam was successfully accumulated for an experiment with an internal hydrogen target at the storage ring ESR of GSI, Germany. The radioactive beam was produced and separated at the GSI fragment separator from a stable 58Ni beam. About 6·104 56Ni ions were injected into the ESR on a high relative momentum orbit. The beam was subjected to stochastic cooling, bunched and transported to a low relative momentum orbit where it was neither disturbed by the field of the partial aperture injection kicker nor by the fields of the stochastic cooling kickers. Slightly below this deposition momentum, the beam was accumulated and continuously cooled by means of electron cooling. For each experiment with internal hydrogen target, about 80 shots were injected consecutively, leading to a stored beam of roughly 5·106 particles.  
TUPWO006 Orbit Correction System at the Collector Ring 1886
  • A. Dolinskyy, O. Chorniy, O.E. Gorda, A.G. Kalimov, H. Leibrock, S.A. Litvinov, M. Steck
    GSI, Darmstadt, Germany
  The CR is dedicated ring for cooling of hot beam coming either from the antiproton separator or SFRS. It is anticipated that the understanding and control of the beam orbits will be important for achieving low beam losses. We describe our plans for measuring and correcting the COD of the CR. The closed orbit of the CR, which is distorted due to magnets misalignments, can reduce the ring acceptance by factor of 2, if a special correction system is not applied. The system, which is developed for the CR should be periodically or manually invoked to correct the global closed orbit and used to adjust the orbit position at some point using local bump. BPM and corrector magnets, which are planned to be used at the CR, are described in this paper. SVD method is used to obtain the corrector strength or corrector factors in global or local orbit correction.  
WEPEA009 Effects of Field Imperfections in the Isochronous Mode of the CR Storage Ring at FAIR 2510
  • S.A. Litvinov, A. Dolinskyy, O.E. Gorda, M. Steck, H. Weick
    GSI, Darmstadt, Germany
  • D. Toprek
    VINCA, Belgrade, Serbia
  Today the challenge is to measure masses of exotic nuclei up to the limits of nuclear existence which are characterized by low production cross-sections and short half-lives. The large acceptance Collector Ring (CR) at FAIR tuned in the isochronous ion-optical mode offers unique possibilities for such measurements. Nonlinear field errors as well as fringe fields of the wide aperture quadrupoles and dipoles strongly excite the high-order aberrations which negatively affect the time resolution of the isochronous ring. Their influence is investigated here and a possible correction scheme is shown.