WEC2I —  Invited Presentations WG E   (11-Oct-23   11:05—12:55)
Paper Title Page
WEC2I1
 Beam Intercepting Device Challenges for High Intensity Accelerators - a Global Perspective  
 
  • A. Perillo Marcone
    CERN, Meyrin, Switzerland
  
  Several beam intercepting devices (BID) are used in particle accelerators for different functions: machine protection (stopping the beam in accidental scenarios), human safety , beam conditioning (e.g. collimators, scrapers, slits), secondary beam production (targets) and absorbers (beam dumps). Since these devices are found in accelerators with a broad range of beam energies and particle types, a large diversity of requirements, materials and designs are observed. Typical considerations are physical and structural properties of materials. Hence, the full palette of materials is used in BIDs across the different accelerators, from ceramics and carbon-based materials (graphite and CfC) to virtually all metals. In addition, some devices need to absorb and manage power (heat) deposited by the beam, which imposes other constraints in the design, like cooling requirements and service temperature of the materials employed. Irradiation damage is also accounted for in the design of some devices. A state of the art of BIDs used in different accelerator complexes in the world will be presented here, including their main functionalities, requirements and design features.  
slides icon Slides WEC2I1 [12.046 MB]  
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WEC2I2
 Operational Performance with FRIB Liquid Lithium and Carbon Charge Strippers  
 
  • T. Kanemura, M.J. LaVere, F. Marti, T. Maruta, Y. Momozaki, P.N. Ostroumov, A.S. Plastun, A. Taylor, J. Wei, Q. Zhao
    FRIB, East Lansing, Michigan, USA
  • Y. Momozaki
    ANL, Lemont, Illinois, USA
  
  Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University
The charge stripping of a primary beam in heavy ion accelerators is an essential process to achieve a high beam energy at targets. The Facility for Rare Isotope Beams (FRIB), which aims at achieving an ultimate primary beam power of 400 kW, has charge strippers where the primary beam energy reaches 17-20 MeV/u in the driver linac. Because of the unprecedented intensity of heavy ion beams to achieve the 400 kW power, ultra-high thermal load and radiation damage to the charge stripping material will make it practically useless if a solid is used. To overcome these challenges, FRIB chose liquid lithium as a revolutionary stripper material, which is a superior heat remover and free from radiation damage. FRIB¿s liquid lithium charge stripper (LLCS) produces a liquid lithium thin film flowing at 60 m/s, which gives a relatively flat film with a thickness of 10-20 ¿m (0.5-1.0 mg/cm2). We also have a carbon foil charge stripper (CCS), which is a carbon foil that rotates and moves vertically to spread thermal and radiation damage. We have demonstrated that both the CCS and LLCS can support 5-kW-at-target Xe primary beam operations. We will discuss their performance in this paper. 		 
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