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Title: Development of a Waveguide FEL Seeded in the 1-3 THz Range for Microbunching Experiment at the Neptune Laboratory

Abstract

IFEL and FEL techniques can be used to modulate an electron beam on the scale of the radiation wavelength. However, the lack of a high power radiation source in the 100-300 {mu}m range hinders the progress on THz IFEL microbunching. In this paper, we discuss microbunching of an electron beam using a single-pass FEL seeded with a low power THz pulse generated by frequency mixing of CO2 laser lines in a GaAs nonlinear crystal. A narrowband THz seed source is pumped by a dual beam TEA CO2 laser and can be tuned in the 1-3 THz range. The THz radiation is guided through a hollow waveguide inside the planar FEL undulator driven by a photoinjector. By using a time-dependent FEL code GENESIS 1.3, we optimized the undulator parameters and analyzed the dynamics of the modulated electron beam. By using a {approx} 8 MeV electron beam with a peak current of 40 A and a {approx}1kW THz seed with wavelength 200 {mu}m, the energy modulation up to 1.3% can be achieved in a {approx}1.8-m long undulator with a constant period of 2.7 cm. At present, the THz seed source is built and fully characterized. The results of transmission measurements for THzmore » waveguides are also discussed.« less

Authors:
; ; ; ; ;  [1]; ;  [2]
  1. Neptune Laboratory, Departments of Electrical Engineering and Physics, University of California, Los Angeles, CA 90095 (United States)
  2. STI Optronics, Inc., Bellevue, WA 98004-1495 (United States)
Publication Date:
OSTI Identifier:
20898772
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 877; Journal Issue: 1; Conference: 12. advanced accelerator concepts workshop, Lake Geneva, WI (United States), 10-15 Jul 2006; Other Information: DOI: 10.1063/1.2409231; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM BUNCHING; CARBON DIOXIDE LASERS; CRYSTALS; ELECTRON BEAMS; FREE ELECTRON LASERS; FREQUENCY MIXING; GALLIUM ARSENIDES; MEV RANGE 01-10; MODULATION; NONLINEAR PROBLEMS; PULSES; RADIATION SOURCES; THZ RANGE 01-100; TIME DEPENDENCE; WAVEGUIDES; WAVELENGTHS; WIGGLER MAGNETS

Citation Formats

Sung, C, Tochitsky, S Ya, Reiche, S, Rosenzweig, J B, Pellegrini, C, Joshi, C, Gottschalk, S C, and Kimura, W D. Development of a Waveguide FEL Seeded in the 1-3 THz Range for Microbunching Experiment at the Neptune Laboratory. United States: N. p., 2006. Web. doi:10.1063/1.2409231.
Sung, C, Tochitsky, S Ya, Reiche, S, Rosenzweig, J B, Pellegrini, C, Joshi, C, Gottschalk, S C, & Kimura, W D. Development of a Waveguide FEL Seeded in the 1-3 THz Range for Microbunching Experiment at the Neptune Laboratory. United States. doi:10.1063/1.2409231.
Sung, C, Tochitsky, S Ya, Reiche, S, Rosenzweig, J B, Pellegrini, C, Joshi, C, Gottschalk, S C, and Kimura, W D. Mon . "Development of a Waveguide FEL Seeded in the 1-3 THz Range for Microbunching Experiment at the Neptune Laboratory". United States. doi:10.1063/1.2409231.
@article{osti_20898772,
title = {Development of a Waveguide FEL Seeded in the 1-3 THz Range for Microbunching Experiment at the Neptune Laboratory},
author = {Sung, C and Tochitsky, S Ya and Reiche, S and Rosenzweig, J B and Pellegrini, C and Joshi, C and Gottschalk, S C and Kimura, W D},
abstractNote = {IFEL and FEL techniques can be used to modulate an electron beam on the scale of the radiation wavelength. However, the lack of a high power radiation source in the 100-300 {mu}m range hinders the progress on THz IFEL microbunching. In this paper, we discuss microbunching of an electron beam using a single-pass FEL seeded with a low power THz pulse generated by frequency mixing of CO2 laser lines in a GaAs nonlinear crystal. A narrowband THz seed source is pumped by a dual beam TEA CO2 laser and can be tuned in the 1-3 THz range. The THz radiation is guided through a hollow waveguide inside the planar FEL undulator driven by a photoinjector. By using a time-dependent FEL code GENESIS 1.3, we optimized the undulator parameters and analyzed the dynamics of the modulated electron beam. By using a {approx} 8 MeV electron beam with a peak current of 40 A and a {approx}1kW THz seed with wavelength 200 {mu}m, the energy modulation up to 1.3% can be achieved in a {approx}1.8-m long undulator with a constant period of 2.7 cm. At present, the THz seed source is built and fully characterized. The results of transmission measurements for THz waveguides are also discussed.},
doi = {10.1063/1.2409231},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 877,
place = {United States},
year = {2006},
month = {11}
}