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Title: Generation of Narrow-Band Coherent Tunable Terahertz Radiation Using a Laser-Modulated Electron Beam

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1096203
Report Number(s):
SLAC-PUB-15779
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Journal Name: Conf.Proc.C1205201:1146-1148,2012; Conference: Presented at the 3rd International Particle Accelerator Conference (IPAC-2012), New Orleans, Louisiana, 20-25 May 2012
Country of Publication:
United States
Language:
English
Subject:
Accelerators,ACCPHY

Citation Formats

Dunning, M.P., Hast, C., Hemsing, E., Jobe, R.K., McCormick, D.J., Nelson, J., Raubenheimer, T.O., Soong, K., Szalata, Z.M., Walz, D.R., Weathersby, S.P., Xiang, D., and /SLAC. Generation of Narrow-Band Coherent Tunable Terahertz Radiation Using a Laser-Modulated Electron Beam. United States: N. p., 2013. Web.
Dunning, M.P., Hast, C., Hemsing, E., Jobe, R.K., McCormick, D.J., Nelson, J., Raubenheimer, T.O., Soong, K., Szalata, Z.M., Walz, D.R., Weathersby, S.P., Xiang, D., & /SLAC. Generation of Narrow-Band Coherent Tunable Terahertz Radiation Using a Laser-Modulated Electron Beam. United States.
Dunning, M.P., Hast, C., Hemsing, E., Jobe, R.K., McCormick, D.J., Nelson, J., Raubenheimer, T.O., Soong, K., Szalata, Z.M., Walz, D.R., Weathersby, S.P., Xiang, D., and /SLAC. Fri . "Generation of Narrow-Band Coherent Tunable Terahertz Radiation Using a Laser-Modulated Electron Beam". United States. doi:. https://www.osti.gov/servlets/purl/1096203.
@article{osti_1096203,
title = {Generation of Narrow-Band Coherent Tunable Terahertz Radiation Using a Laser-Modulated Electron Beam},
author = {Dunning, M.P. and Hast, C. and Hemsing, E. and Jobe, R.K. and McCormick, D.J. and Nelson, J. and Raubenheimer, T.O. and Soong, K. and Szalata, Z.M. and Walz, D.R. and Weathersby, S.P. and Xiang, D. and /SLAC},
abstractNote = {},
doi = {},
journal = {Conf.Proc.C1205201:1146-1148,2012},
number = ,
volume = ,
place = {United States},
year = {Fri Oct 11 00:00:00 EDT 2013},
month = {Fri Oct 11 00:00:00 EDT 2013}
}

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  • We propose a method based on the slice energy spread modulation to generate strong subpicosecond density bunching in high-intensity relativistic electron beams. A laser pulse with periodic intensity envelope is used to modulate the slice energy spread of the electron beam, which can then be converted into density modulation after a dispersive section. It is found that the double-horn slice energy distribution of the electron beam induced by the laser modulation is very effective to increase the density bunching. Since the modulation is performed on a relativistic electron beam, the process does not suffer from strong space charge force ormore » coupling between phase spaces, so that it is straightforward to preserve the beam quality for terahertz (THz) radiation and other applications. We show in both theory and simulations that the tunable radiation from the beam can cover the frequency range of 1 - 10 THz with high power and narrow-band spectra.« less
  • We propose a method based on the slice energy spread modulation to generate strong subpicosecond density bunching in high-intensity relativistic electron beams. A laser pulse with periodic intensity envelope is used to modulate the slice energy spread of the electron beam, which can then be converted into density modulation after a dispersive section. It is found that the double-horn slice energy distribution of the electron beam induced by the laser modulation is very effective to increase the density bunching. Since the modulation is performed on a relativistic electron beam, the process does not suffer from strong space charge force ormore » coupling between phase spaces, so that it is straightforward to preserve the beam quality for terahertz (THz) radiation and other applications. We show in both theory and simulations that the tunable radiation from the beam can cover the frequency range of 1 - 10 THz with high power and narrow-band spectra.« less
  • We experimentally demonstrate the production of narrow-band ({delta}f/f{approx_equal}20% at f{approx_equal}0.5THz) transition radiation with tunable frequency over [0.37, 0.86] THz. The radiation is produced as a train of sub-picosecond relativistic electron bunches transits at the vacuum-aluminum interface of an aluminum converter screen. The bunch train is generated via a transverse-to-longitudinal phase space exchange technique. We also show a possible application of modulated beams to extend the dynamical range of a popular bunch length diagnostic technique based on the spectral analysis of coherent radiation.
  • We experimentally demonstrate the production of narrow-band (δf/f ~ =20% at f ~ = 0.5 THz) THz transition radiation with tunable frequency over [0.37, 0.86] THz. The radiation is produced as a train of sub-picosecond relativistic electron bunches transits at the vacuum-aluminum interface of an aluminum converter screen. In addition, we show a possible application of modulated beams to extend the dynamical range of a popular bunch length diagnostic technique based on the spectral analysis of coherent radiation.
  • Nearly transform limited pulses of 1216 A radiation have been generated by sum frequency generation in 0.1 to 10 torr of mercury vapor. The summed input beams, consisting of photons at 3127 A and 5454 A originate in 1 MHz band-width ring-dye laser oscillators. The beams are amplified in pulsed-dye amplifiers pumped by the frequency doubled output of a Nd:YAG laser. The 3127 A photons are tuned to be resonant with the two-photon 6{sup 1}S to 7{sup 1}S mercury transition. The VUV radiation can be tuned by varying the frequency of the third non-resonant photon. We have also observed differencemore » frequency generation at 2193 A and intense fluorescence from the 6{sup 1}P state at 1849 A. We have studied the intensity and linewidth dependence of the 1849 A fluorescence and 1216 A sum frequency signals on input beam intensity, mercury density, and buffer gas pressure and composition.« less