Author: Steck, M.
Paper Title Page
MOPM1HA01
 Status of the FAIR Project  
 
  • M. Steck
    GSI, Darmstadt, Germany
  
  The scope of the FAIR project has passed through various modifications. The first stage of the the FAIR project, the Modularized Start Version (MSV), was defined based on the available funding by the international partners. Although some of the accelerator systems are not included in the MSV, all major experiment collaborations will be provided with new or improved beam properties compared to the beam conditions presently offered at GSI. Beam cooling will mainly be employed in the preparation of secondary beams of rare isotopes and antiprotons. Besides stochastic cooling of secondary beams in the new Collector Ring (CR), cooling will also be applied in the new High Energy Storage Ring (HESR) and in the former CRYRING, which is presently prepared for installation behind the existing ESR. The HESR, which was originally designed for operation with cooled antiprotons, is presently redesigned to allow experiments with stable ions and rare isotope beams. The project CRYRING@ESR aims at the deceleration of highly charged ions and rare isotopes injected from the ESR at a typical energy of 4 MeV/u. In the first stage it will be used as a test facility for accelerator developments for FAIR.  
slides icon Slides MOPM1HA01 [5.089 MB]  
 
TUAM1HA01 Progress of the Stochastic Cooling System of the Collector Ring 40
 
  • C. Dimopoulou, D. Barker, R.M. Böhm, A. Dolinskyy, B. J. Franzke, R. Hettrich, W. Maier, R. Menges, F. Nolden, C. Peschke, P. Petri, M. Steck
    GSI, Darmstadt, Germany
  • L. Thorndahl
    CERN, Geneva, Switzerland
  
  An overview of the recent achievements and ongoing developments for the stochastic cooling system of the Collector Ring is given. In focus are the hardware developments as well as the progress in predicting the system performance. The system operates in the frequency band 1-2 GHz, it has to provide fast 3D cooling of antiproton, rare isotope and stable heavy ion beams. The main challenges are (i) the cooling of antiprotons by means of cryogenic movable pick-up electrodes and (ii) the fast two-stage cooling (pre-cooling by the Palmer method, followed by the notch filter method) of the hot rare isotopes. Recently, a novel code for simulating the cooling process in the time domain has been developed at CERN. First results for the momentum cooling for heavy ions in the CR will be shown in comparison with results obtained in the frequency domain with the Fokker-Planck equation.  
slides icon Slides TUAM1HA01 [4.320 MB]  
 
TUAM1HA04 Simulation Study of Stochastic Cooling of Heavy Ion Beam at the Collector Ring of FAIR 52
 
  • T. Katayama, C. Dimopoulou, A. Dolinskyy, F. Nolden, M. Steck
    GSI, Darmstadt, Germany
  
  In the modularized start version of the FAIR project, the New Experimental Storage Ring is not included and therefore the task of the stochastic cooling system at the Collector Ring (CR) has been until now focused on the 3 GeV anti-proton beam. On the other hand, recently the SPARC collaboration has proposed to start the high energy atomic physics experiments in the HESR ring with stable ions, typically a 238U92+ beam, implementing the internal target. Furthermore the future possibility of the nuclear physics experiments with rare isotope beams, typically 132Sn50+ beam, in the HESR is envisaged. In the present report, the beam dynamics, mainly the longitudinal motion from the front-end (superconducting fragment separator) to the back-end (fast extraction from the CR) are described emphasizing the process of stochastic cooling of the rare isotope beam.  
slides icon Slides TUAM1HA04 [2.504 MB]  
 
WEPPO19 The Novel Optical Notch Filter for Stochastic Cooling at the ESR 142
 
  • W. Maier, C. Dimopoulou, R. Hettrich, F. Nolden, C. Peschke, P. Petri, M. Steck
    GSI, Darmstadt, Germany
  
  In the frame of the development for the FAIR facility at GSI, notch filter cooling is essential for the stochastic cooling system of the CR (Collector Ring). A prototype notch filter based on optical components has been developed and built. The focus was to achieve sufficient notch depth and low dispersion of the filter transfer function. The compact optical notch filter was integrated into the ESR stochastic cooling system. Momentum cooling of heavy ion beams was successfully demonstrated. The layout of the notch filter as well as experimental results are presented  
 
THAM1HA04 Laser Cooling of Relativistic C3+ Ion Beams with a Large Initial Momentum Spread 166
 
  • D.F.A. Winters, C.J. Clark, C. Dimopoulou, T. Giacomini, C. Kozhuharov, T. Kühl, Yu.A. Litvinov, M. Lochmann, W. Nörtershäuser, F. Nolden, R.M. Sanchez Alarcon, M.S. Sanjari, M. Steck, T. Stöhlker, J. Ullmann
    GSI, Darmstadt, Germany
  • T. Beck, G. Birkl, B. Rein, S. Tichelmann, T. Walther
    TU Darmstadt, Darmstadt, Germany
  • M.H. Bussmann, U. Schramm, M. Seltmann
    Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany
  • X. Ma, W.Q. Wen, J. Yang, D. Zhang
    IMP, Lanzhou, People's Republic of China
  • M. Siebold
    HZDR, Dresden, Germany
  
  We present new results on broadband laser cooling of stored relativistic C3+ ion beams at the ESR in Darmstadt. For the first time we could show laser cooling of bunched relativistic ion beams using a UV-laser which could scan over a very large range and thus cool all the ions in the ‘bucket’. This scheme is much more versatile than a previous scheme, where the bunching frequency was scanned relative to a fixed laser frequency. We have also demonstrated that this cooling scheme works without pre-electron cooling, which is a pre-requisite for its general application to future storage rings and synchrotrons, such as the HESR and the SIS100 at FAIR. We also present results from in vacuo UV-fluorescence detectors, which have proven to be very effective.  
slides icon Slides THAM1HA04 [4.231 MB]  
 
THAM2HA01 Beam Accumulation and Bunching with Cooling 170
 
  • T. Katayama, M. Steck
    GSI, Darmstadt, Germany
  • T. Kikuchi
    Nagaoka University of Technology, Nagaoka, Niigata, Japan
  • I.N. Meshkov
    JINR, Dubna, Moscow Region, Russia
  • H. Stockhorst
    FZJ, Jülich, Germany
  
  The accumulation of anti-proton beam in the storage ring was performed at CERN and FNAL with use of a stochastic stacking system. In the original version of the FAIR such a concept was envisaged at the accumulator ring named RESR. However in the modularized start version of FAIR, the RESR was postponed and the new concept of anti-proton accumulation in the High Energy Storage Ring (HESR) was strongly demanded. The barrier bucket system with stochastic cooling was found with simulation work to have enough capabilities to accumulate the pre-cooled 3 GeV anti-proton beam in the HESR. The Proof Of Principle (POP) experiment was performed at the GSI storage ring ESR with the use of Ar and Xe ion beam employing both stochastic and electron cooling. The experimental results were well in agreement with the prediction of the simulation study. The concept of BB accumulation could be applied to the planned Collider of the NICA project at JINR. In the present paper the concept of BB accumulation and the short bunch formation including the space charge effects are presented as well as the analysis of POP experiment.  
slides icon Slides THAM2HA01 [8.446 MB]  
 
THPM1HA01 The Low Energy Storage Ring CRYRING@ESR 189
 
  • F. Herfurth, A. Bräuning-Demian, W. Enders, B. J. Franzke, O.K. Kester, M. Lestinsky, Yu.A. Litvinov, M. Steck, T. Stöhlker, G. Vorobjev
    GSI, Darmstadt, Germany
  • H. Danared
    ESS, Lund, Sweden
  • M. Engström, A. Källberg, A. Simonsson, Ö. Skeppstedt
    MSL, Stockholm, Sweden
  • A. Heinz
    Chalmers University of Technology, Chalmers Tekniska Högskola, Gothenburg, Sweden
  • D. Reistad
    Intégro Utbildnings AB, Sigtuna, Sweden
  • J. Sjöholm
    FYSIKUM, AlbaNova, Stockholm University, Stockholm, Sweden
  
  The Swedish in-kind contribution to the FAIR facility in Darmstadt, the heavy-ion storage ring CRYRING, has been transported to Darmstadt recently. Instead of warehousing until installation at the Facility for Antiproton and Ion Research, FAIR, the immediate installation behind the existing Experimental Storage Ring, ESR, has been proposed. CRYRING can decelerate, cool and store heavy, highly charged ions that come from the ESR down to a few 100 keV/nucleon. It provides a high performance electron cooler in combination with a gas jet target and thus opens up a very attractive physics program as a natural extension of the ESR, which can only operate down to about 4 MeV/nucleon. CRYRING@ESR also provides beams of low charged ions independently on the GSI accelerator. All this makes CRYRING@ESR the perfect machine for FAIR related tests of diagnostics, software and concepts, and atomic physics experiments with heavy, highly charged ions stored at low energy. Perspectives are also opened up for low-energy nuclear physics investigations. CRYRING@ESR is a first step towards atomic physics with low-energy, highly charged ions at FAIR as planned within the SPARC and APPA collaborations.  
slides icon Slides THPM1HA01 [4.611 MB]