Self-amplification of coherent spontaneous emission in a cherenkov free-electron maser

Mark Wiggins, D.A. Jaroszynski, B.W.J. McNeil, G.R.M. Robb, P. Aitken, A.D.R. Phelps, A.W. Cross, K. Ronald, N.S. Ginzburg, V.G. Shpak, M.I. Yalandin, S.A. Shunailov, M.R. Ulmaskulov

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Ultrashort pulses of microwave radiation have been produced in a dielectric-lined Cherenkov free-electron maser (FEM) amplifier. An intense initial seed pulse, due to coherent spontaneous emission (CSE), arises at the leading edge of the electron pulse. There is evidence to show that 3-4 cycle spikes are produced through the amplification of these seed pulses. A strong dependence of the start-up power on the rise time of the electron pulse has been found. The experimental results are verified by a theoretical analysis. Our study shows that amplification in a FEM amplifier is always initiated by CSE arising from the edge of the electron pulse when the rise time is comparable to the electromagnetic wave period.
LanguageEnglish
Pages2393-2396
Number of pages4
JournalPhysical Review Letters
Volume84
Issue number11
DOIs
Publication statusPublished - 13 Mar 2000

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masers
spontaneous emission
free electrons
pulses
seeds
amplifiers
electrons
leading edges
spikes
electromagnetic radiation
microwaves
cycles

Keywords

  • self-amplification
  • coherent
  • spontaneous
  • emission
  • maser

Cite this

Wiggins, Mark ; Jaroszynski, D.A. ; McNeil, B.W.J. ; Robb, G.R.M. ; Aitken, P. ; Phelps, A.D.R. ; Cross, A.W. ; Ronald, K. ; Ginzburg, N.S. ; Shpak, V.G. ; Yalandin, M.I. ; Shunailov, S.A. ; Ulmaskulov, M.R. . / Self-amplification of coherent spontaneous emission in a cherenkov free-electron maser. In: Physical Review Letters. 2000 ; Vol. 84, No. 11. pp. 2393-2396.
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Self-amplification of coherent spontaneous emission in a cherenkov free-electron maser. / Wiggins, Mark; Jaroszynski, D.A.; McNeil, B.W.J.; Robb, G.R.M.; Aitken, P.; Phelps, A.D.R.; Cross, A.W.; Ronald, K.; Ginzburg, N.S.; Shpak, V.G. ; Yalandin, M.I. ; Shunailov, S.A. ; Ulmaskulov, M.R. .

In: Physical Review Letters, Vol. 84, No. 11, 13.03.2000, p. 2393-2396.

Research output: Contribution to journalArticle

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T1 - Self-amplification of coherent spontaneous emission in a cherenkov free-electron maser

AU - Wiggins, Mark

AU - Jaroszynski, D.A.

AU - McNeil, B.W.J.

AU - Robb, G.R.M.

AU - Aitken, P.

AU - Phelps, A.D.R.

AU - Cross, A.W.

AU - Ronald, K.

AU - Ginzburg, N.S.

AU - Shpak, V.G.

AU - Yalandin, M.I.

AU - Shunailov, S.A.

AU - Ulmaskulov, M.R.

PY - 2000/3/13

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AB - Ultrashort pulses of microwave radiation have been produced in a dielectric-lined Cherenkov free-electron maser (FEM) amplifier. An intense initial seed pulse, due to coherent spontaneous emission (CSE), arises at the leading edge of the electron pulse. There is evidence to show that 3-4 cycle spikes are produced through the amplification of these seed pulses. A strong dependence of the start-up power on the rise time of the electron pulse has been found. The experimental results are verified by a theoretical analysis. Our study shows that amplification in a FEM amplifier is always initiated by CSE arising from the edge of the electron pulse when the rise time is comparable to the electromagnetic wave period.

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