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Neuman, C. P.

Paper Title Page
THPAS001 Suppression of Terahertz Radiation in Electron Beams with Longitudinal Density Modulation 3507
 
  • C. P. Neuman
    CUNY, Bayside, New York
  • P. G. O'Shea
    UMD, College Park, Maryland
 
  Electron beams with periodic longitudinal density modulations may produce terahertz radiation in a linear accelerator. Terahertz radiation is useful for a wide range of applications and research interests. In other cases, it may be desirable to suppress unwanted terahertz radiation caused by unintended fluctuations of the electron beam. This study explores the possibility of using a wiggler to convert the density modulation to energy modulation. Previous studies by the author (*) have shown that energy modulation washes out of the beam as it is transported in a linear accelerator system. Thus, by converting density modulation to energy modulation and then letting it wash out, we will have suppressed density modulation in the beam and thus the possibility of unwanted terahertz radiation. Simulations are performed using PARMELA and other software codes. Results will provide a better understanding of the evolution of modulated electron beams and may provide a method to suppress unwanted terahertz radiation. Parameters in the simulations are chosen to correspond to existing accelerator systems so that the results may be used to support an experimental study.

(*) Simulation of Longitudinally Modulated Electron Beams. C. P. Neuman and P. G. O'Shea. In 2006 Advanced Accelerator Concepts Workshop, AIP Conference Proceedings, 877, 621-627. Melville, AIP (2006).

 
THPAS002 Evolution of Longitudinal Modulation in Electron Beams 3510
 
  • C. P. Neuman
    CUNY, Bayside, New York
  • P. G. O'Shea
    UMD, College Park, Maryland
 
  Electron beams with periodic longitudinal density modulations may produce terahertz radiation in a linear accelerator. Whether the radiation is desired or not, it would be useful to understand how the modulations of an electron bunch evolve as the beam is transported through a linac system. Recent studies (*) show that density modulated beams lose their density modulation in favor of energy modulation. Thus, it is instructive to simulate beams that have only density modulation and beams that have only energy modulation. The former is useful for learning how to keep the desired density modulation for beams intended to create terahertz radiation, the latter for learning how to suppress unwanted energy modulation, which may have originated as density modulation. In this study, simulations are performed using PARMELA and other software codes. The study investigates energy ranges that are higher than those studied in the author’s previous work, and the study also focuses on the evolution of the beam in the electron gun. Parameters in the simulations are chosen to correspond to existing accelerator systems so that the results may be used to support an experimental study.

(*) Simulation of Longitudinally Modulated Electron Beams. C. P. Neuman and P. G. O'Shea. In 2006 Advanced Accelerator Concepts Workshop, AIP Conference Proceedings 877, edited by M. Conde and C. Eyberger, 621-627. Melville, NY, AIP (2006).