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Aulenbacher, K.

Paper Title Page
WE6PFP063 Concept for a Polarized Electron-Nucleon Collider Utilizing the HESR Storage Ring at GSI/FAIR 2646
 
  • A. Lehrach
    FZJ, Jülich
  • K. Aulenbacher, A. Jankowiak
    IKP, Mainz
  • W. Hillert
    ELSA, Bonn
  • C. Montag
    BNL, Upton, Long Island, New York
  • T. Weis
    DELTA, Dortmund
  
 

The feasibility of a polarized Electron-Nucleon Collider (ENC) with a center-of-mass energy up to 13.5 GeV for luminosities above 2·1032 cm-2 s-1 is presently under consideration. The proposed concept integrates the planned 14 GeV High-Energy Storage Ring (HESR) for protons/deuterons and an additional 3 GeV electron ring. Calculations of cooled beam equilibria including intra-beam scattering and beam-beam interaction have been performed utilizing the BetaCool code. A special design of the interaction region is required to realize back-to-back operation of the HESR storage ring together with the elaborated collider mode. For polarized proton/deuteron beams additional equipment has to be implemented in several machines of the acceleration chain and the HESR to preserve the beam’s polarization. A scheme for polarized electrons is still under investigation. In this presentation the required modifications and extensions of the HESR accelerator facility at the future International Facility for Antiproton and Ion Research (FAIR) are discussed and the proposed concept is presented.

  
WE6PFP111 The First Two Years of Operation of the 1.5 GeV CW Electron Accelerator MAMI C 2772
 
  • A. Jankowiak, K. Aulenbacher, O. Chubarov, M. Dehn, H. Euteneuer, R.G. Heine, P. Jennewein, H.-J. Kreidel, U. Ludwig-Mertin, O. Ott, G.S. Stephan, V. Tioukine
    IKP, Mainz
  
 

Funding: Work supported by DFG (CRC443) and the German Federal State of Rheinland-Pfalz


In December 2006 the maximum output energy of the cw race track microtron cascade MAMI B was increased to 1508MeV by the successful commissioning of the world wide first Harmonic-Double-Sided-Microtron (HDSM)* as a new fourth stage. Since then MAMI C was in operation for more than 15000 hours, delivering approx. 10000 hours the maximum beam energy of 1508MeV. We will report about our operational experiences and the recent machine developments concerning e.g. the increase of the energy and stabilisation of the output energy down to 10-6. Topics of machine reliability and stability will be addressed and the operation under different demands of nuclear physics experiments described.


*K.-H. Kaiser et al., NIM A 593 (2008) 159 - 170, doi:10.{10}16/j.nima.2008.05.018