THA1WD —  WG-D   (21-Jun-18   08:30—10:30)
Chair: H. Hotchi, JAEA/J-PARC, Tokai-mura, Japan
Paper Title Page
THA1WD01 Experience and Perspective of FFAG Accelerator -1
  • Y. Mori
    Kyoto University, Research Reactor Institute, Osaka, Japan
  Funding: This work was funded by ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
This talk is about operational challenge and perspective of Fixed Field Alternating Gradient accelerators, including the recent studies on advanced FFAG for high intensity secondary particles.
SNS Operation and Upgrade Plans  
  • A.P. Shishlo
    ORNL, Oak Ridge, Tennessee, USA
  Funding: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy.
The future power upgrade and operation parameters of the Spallation Neutron Source at Oak Ridge National Laboratory are discussed. The installation of seven additional superconducting cavities in the existing free space of the linear accelerator will increase the beam energy to 1.3 GeV. More than 95% of the installed ring and transport systems are presently capable of 1.3 GeV operation. Combination of the new beam energy and increasing the average beam current by ~50% will double the accelerator power capability to 2.8 MW. The Mercury spallation neutron target will be upgraded to a capacity of 2.0 MW beam power.
slides icon Slides THA1WD02 [4.211 MB]  
THA1WD03 Status and Beam Power Ramp-Up Plans of the Slow Extraction Operation at J-Parc Main Ring -1
  • M. Tomizawa, Y. Arakaki, T. Kimura, S. Murasugi, R. Muto, K. Okamura, Y. Shirakabe, E. Yanaoka
    KEK, Ibaraki, Japan
  A 30 GeV proton beam accelerated in the J-PARC Main Ring (MR) is slowly extracted by the third integer resonant extraction and delivered to the hadron experimental hall. Slow extraction from the MR has unique characteristics that can be used to obtain a low beam loss rate. Devices with electrostatic septum (ESSs) and magnetic septa are placed in the long straight section with zero dispersion. The separatrix for the resonance is independent of the momentum at the septa when the horizontal chromaticity is set to zero. The resulting beam has a large step size and small angular spread, enabling a low hit rate of the beam at the first ESS. Under these conditions, a dynamic bump scheme has been applied to reduce the beam loss further. We have attained 50 kW operation at 5.2s cycle in the latest physics run. A suppression of instability during debunch process is also essential as well as low beam loss tunings. In this paper, a current status and future plans toward a higher beam power for the slow extraction are reported. Preliminary results for a 8 GeV slow extraction test for the muon to electron conversion search experiment (COMET) will be also briefly presented.  
slides icon Slides THA1WD03 [9.174 MB]  
THA1WD04 High-Brightness Challenges for the Operation of the CERN Injector Complex -1
  • K. Hanke, S.C.P. Albright, R. Alemany-Fernández, H. Bartosik, E. Chapochnikova, H. Damerau, G.P. Di Giovanni, B. Goddard, A. Huschauer, V. Kain, A. Lasheen, M. Meddahi, B. Mikulec, G. Rumolo, R. Scrivens, F. Tecker
    CERN, Geneva, Switzerland
  CERN's LHC injectors are delivering high-brightness proton and ion beams for the Large Hadron Collider LHC. We review the present operation modes and beam performance, and highlight the limitations. We will then give an overview of the upgrade program that has been put in place to meet the demands of the LHC during the High-Luminosity LHC era.  
slides icon Slides THA1WD04 [4.746 MB]