TUO1B  —  Beam Dynamics in High-Intensity Linacs   (28-Sep-10   10:50—12:30)

Chair: A.M. Lombardi, CERN, Geneva

Paper Title Page
TUO1B01 Beam Dynamics and Design of the ESS LINAC 300
 
  • M. Eshraqi, M. Brandin, C.J. Carlile, M. Lindroos, S. Peggs, A. Ponton, K. Rathsman, J. Swiniarski
    ESS, Lund
 
 

The European Spallation Source, ESS, will use a linear accelerator delivering high current long pulses with an average beam power of 5 MW to the target station at 2.5 GeV in the nominal design. The possibilities to upgrade to a higher power LINAC at fixed energy are considered. This paper will present a full review of the LINAC design and the beam dynamics studies.

 

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TUO1B02 Beam Dynamics of SPL: Issues and Solutions 304
 
  • P.A. Posocco, A.M. Lombardi
    CERN, Geneva
  • M. Eshraqi
    ESS, Lund
 
 

SPL is a superconducting H- LINAC under study at CERN. The SPL is designed to accelerate the 160 MeV beam of LINAC4 to 4-5 GeV, and is composed of two families of 704.4 MHz elliptical cavities with geometrical betas of 0.65 and 1.0 respectively. Two families of cryo-modules are considered: the low-beta cryo-module houses 6 low-beta cavities and 4 quadrupoles, whereas the high-beta one houses 8 cavities and 2 quadrupoles. The regular focusing structure of the machine is interrupted at the transition between low beta and high beta structure and at 1.4 and 2.5 GeV for extracting medium energy beam. The accelerator is designed for max. 60 mA peak current (40 mA average) and max. 4% duty cycle, implying a very accurate control of beam losses. In particular the choice of the diagnostics and correction system, the maximum quadrupole gradient to avoid Lorentz stripping and the effect of the RF power delivery system on the beam quality are discussed in this paper.

 

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TUO1B03 The IFMIF-EVEDA Challenges and their Treatment 309
 
  • P.A.P. Nghiem, N. Chauvin, O. Delferrière, R.D. Duperrier, A. Mosnier, D. Uriot
    CEA, Gif-sur-Yvette
  • M. Comunian
    INFN/LNL, Legnaro (PD)
  • C. Oliver
    CIEMAT, Madrid
 
 

The IFMIF project (International Fusion Materials Irradiation Facility) is one of the three parts of the Fusion Broader Approach signed by Japan and Europe, aiming at studying materials which must resist to very intense neutron radiations in future fusion reactors. One major system of this project is its two accelerators producing the neutron flux by accelerating Deuteron particles up to 40 MeV against a Lithium target. In a first phase called EVEDA (Engineering Validation and Engineering Design Activity), a full scale prototype accelerating particles up to 9 MeV is being studied and constructed in Europe, to be installed in Japan. Two unprecedented performances are required: the very high power and very high intensity of 2x5 MW and 2x125 mA CW. That leads to numerous unprecedented challenges: harmful losses even for those as low as 10-6 of the beam, non-linear dynamics induced by very strong space charge forces, difficulties for equipment and diagnostic implementations in the high compact sctructure, need of specific tuning strategies in this context. These issues are highlighted in this article, and the ways they are addressed are detailed.

 

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TUO1B04 Overview of Beam Optics in Project-X Superconducting SC CW Linac 314
 
  • J.-F. Ostiguy, J.-P. Carneiro, N. Solyak, A. Vostrikov
    Fermilab, Batavia
 
 

Project-X is a proposed multi-MW proton facility at Fermilab. Based on a new superconducting H- linear accelerator, it would provide the foundation for a flexible long term intensity frontier physics research program. Two machine configurations have been developed. The first one involves a single 8 GeV, pulsed linac (9 mA peak, 1 ms @ 5 Hz pulses) followed by accumulation and acceleration to 60-120 GeV in the existing Main Injector synchrotron. The second -and currently favoured one- replaces the single pulsed linac by a 3 GeV (10 mA peak, 1 mA average @ 325 MHz), continuous wave linac followed, up to 8 GeV, by either a rapid cycling synchrotron or a second (pulsed) linac. We present here an overview of beam optics for the 3 GeV CW linac. Constraints related to cryostat configuration, field limits in cavities, particle loss mechanisms, and the need for warm instrumentation sections are discussed. Alignment, field amplitude and phase tolerances are also addressed.

 

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TUO1B05 Beam Dynamics in the FRIB Linac 319
 
  • R.C. York, M. Doleans, F. Marti, X. Wu
    NSCL, East Lansing, Michigan
  • E. Pozdeyev, Q. Zhao
    FRIB, East Lansing, Michigan
 
 

The 2007 Long Range Plan for Nuclear Science had as one of its highest recommendations the “construction of a Facility for Rare Isotope Beams (FRIB) a world-leading facility for the study of nuclear structure, reactions, and astrophysics. Experiments with the new isotopes produced at FRIB will lead to a comprehensive description of nuclei, elucidate the origin of the elements in the cosmos, provide an understanding of matter in the crust of neutron stars, and establish the scientific foundation for innovative applications of nuclear science to society.” A superconducting, heavy-ion, driver linac will be used to provide stable beams of >200 MeV/u at beam powers up to 400 kW that will be used to produce rare isotopes. An overview of the beam dynamics will be presented.

 

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