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O'Hara, J. F.

Paper Title Page
THPP026 IH Accelerating Structures with PMQ Focusing for Low-energy Light Ions 3428
 
  • S. S. Kurennoy, S. Konecni, J. F. O'Hara, L. Rybarcyk
    LANL, Los Alamos, New Mexico
 
  We are developing high-efficiency room-temperature RF accelerating structures for beam velocities in the range of a few percent of the speed of light by merging two well-known ideas: inter-digital H-mode (IH) cavities and the transverse beam focusing with permanent-magnet quadrupoles (PMQ). Combining electromagnetic 3-D modeling with beam dynamics simulations and thermal-stress analysis, we have proved that such structures provide a very efficient and practical accelerator for light-ion beams of considerable currents. The IH accelerating structures with PMQ focusing following a short RFQ can be used in the front end of ion linacs or in stand-alone applications such as a compact deuteron-beam accelerator up to the energy of a few MeV.  
THPP027 Heating and Stress in the LANSCE Side-coupled Linac RF Cavities 3431
 
  • S. S. Kurennoy, S. Konecni, J. F. O'Hara, L. Rybarcyk
    LANL, Los Alamos, New Mexico
 
  RF heating and related temperature distribution and stress are important problems in room-temperature accelerating cavities operating at high duty factors. To evaluate feasibility of higher duty operations of the Los Alamos Neutron Science Center (LANSCE) side-coupled linac (SCL), we have performed a combined 3-D electromagnetic (EM) and thermal-stress analysis of the SCL RF cavities. In the process, we have developed a procedure and interface for data exchange between the electromagnetic (MicroWave Studio) and engineering (COSMOS) codes for the combined EM-engineering analysis. This interface can be useful for other applications involving room-temperature accelerating cavities.