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Long, J.

Paper Title Page
THPMN091 Study on High Flux Accelerator Based Slow Positrons Source 2921
  • J. Long, S. Chemerisov, W. Gai, C. D. Jonah, W. Liu, H. Wang
    ANL, Argonne, Illinois
  This work represents a new direction in the development of linac-based high intense slow positron source. The approach is to use RF cavities to decelerate positrons (to ~100 keV) which are produced from a high-energy electron (~10 MeV) beam irradiating a heavy-metal target. In this paper, we present simulation works on the technique to decelerate the positrons to energies where techniques such as penning traps, DC deceleration or moderation can be done with high efficiency. Present techniques for decelerating positrons by thermalizing them in tungsten moderator have an efficiency of 10-3 to 10-5 slow positrons per high energy positron, so even modest success in decelerating and trapping positrons can lead to an increase in the production of low-energy positrons. The challenging aspect of this work is the broad energy and angular distribution of the positrons produced by pair-production in the heavy-metal target. We have explored the use of an adiabatic-matching device and a pillbox RF cavity and have obtained promising results.  
THPMS096 Development of a Dielectric-Loaded Test Accelerator 3211
  • S. H. Gold
    NRL, Washington, DC
  • W. Gai, R. Konecny, J. Long, J. G. Power
    ANL, Argonne, Illinois
  • C.-J. Jing
    Euclid TechLabs, LLC, Solon, Ohio
  • A. K. Kinkead
  • C. D. Nantista, S. G. Tantawi
    SLAC, Menlo Park, California
  Funding: Work supported by DoE and ONR.

A joint project is underway by the Naval Research Laboratory (NRL) and Argonne National Laboratory (ANL), in collaboration with the Stanford Linear Accelerator Center (SLAC), to develop a compact X-band accelerator for testing dielectric-loaded accelerator (DLA) structures.* The accelerator will use a 5-MeV injector previously developed by the Tsinghua University in Beijing, China, and will accommodate test structures up to 0.5 m in length. Both the injector and the structures will be powered by an 11.4-GHz magnicon amplifier that can produce 25 MW, 200-ns output pulses at up to 10 Hz. The injector will require ~5 MW of rf power, leaving ~20 MW to power the test structures. This paper will present a progress report on the construction and commissioning of the test accelerator, which will be located in a concrete bunker in the Magnicon Facility at NRL.

* S. H. Gold et al., Proc. PAC 2005.