MOIC  —  Invited Plenary - Session C   (27-Sep-10   14:30—16:15)

Chair: W. Chou, Fermilab, Batavia

Paper Title Page
MOIC01 Towards the High Intensity Limit in the FAIR Project - Present Status and Future Challenges 34
 
  • P.J. Spiller
    GSI, Darmstadt
 
 

Increasing the intensity of heavy ion beams in synchrotrons, especially in the low and intermediate energy range, requires a reduction of the charge state. With an increase of two orders of magnitude compared to the present intensity levels at GSI, the FAIR project is aiming for the highest heavy ion beam intensities world wide. Space charge limits and significant beam loss in stripper stages disable a continuation of the present high charge state operation. The presently achieved level of heavy ion beam intensities is in the order of 109 heavy ions per cycle. The FAIR intensities of 1011 heavy ions per cycle can only be reached by acceleration of U28+-ions instead of U73+-ions. Meanwhile, after partially completing the upgrade program of SIS18, the number of U28+-ions accelerated to the SIS100 injection energy, could be increased by a factor of 70. The specific challenge of the intermediate charge state operation is the high cross section for ionization in combination with gas desorption processes and the dynamic vacuum pressure. The achieved progress in minimizing the ionization beam loss underlines that the chosen technical strategies described in this report are appropriate.

 

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MOIC02 High Intensity Aspects of the CSNS Proton Accelerators 38
 
  • J. Tang, S. Fu, L. Ma
    IHEP Beijing, Beijing
 
 

CSNS (China Spallation Neutron Source) is a project under construction, which will be a unique facility in China for multi-disciplinary research using neutron scattering techniques. The CSNS accelerator complex is designed to deliver proton beams of 100 kW at Phase One, and progressively upgraded to 200 kW at Phase Two and 500 kW at Phase Three. The upgrading path in beam power is via the increase in linac energy and more accumulated particles in the RCS (Rapid Cycling Synchrotron). Beam losses are key in designing and operating the accelerator complex. Emittance growth, RF trapping loss, and injection/extraction are the major loss sources. The measures to reduce the loss rate and the collimation methods in the accelerators are presented in the talk. Some beam loading effects to the RF systems in the linac and in the RCS, and the uniformization of the beam spot at the spallation target by non-linear magnets are also mentioned.

 

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MOIC03 Brief Report of the First Workshop of the Joint ICFA-ICUIL Taskforce on High Average Power Lasers for Future Accelerators 43
 
  • W. Leemans
    LBNL, Berkeley, California
 
 

A Joint Task Force on Future Applications of Laser Acceleration, has been formed to develop a roadmap for laser technology for future accelerators. The taskforce is operating under the umbrella of ICFA (International Committee for Future Accelerators) and ICUIL (International Committee on Ultra-High Intensity Lasers). A first workshop was organized by the Task Force on April 8-10 (2010) at GSI (Darmstadt), with invited experts on high power laser technology as well as accelerator technology. The main topics were the laser performance needed for accelerator technology to support the most challenging present and future accelerator needs, as well as questions of laser architecture, laser material and optical components. Accelerator and light source representatives outlined the top level laser requirements for potential laser-based accelerator applications, i.e. colliders, light sources and medical applications. An overview of the outcome of this workshop will be presented, including a discussion on laser requirements for acceleration of electrons and ions.

 

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